There is also a american internet firm Jana, with its mCent internet app, which makes possible for people in poor countries to use internet without line costs in poor countries. It not only makes toll free internet possible, but even gives extra internet time credit which is possible to spend on other internet use that requires payment. It has a some sort of own toll-free “app store” too. Jana / mCent has been developed in MIT Media Lab.
There are so called ecological search engines that give almost all profit they get from their net service to enviromental purposes. They can be found for example “10 search engines to help the envoroment” and “5 best search engines to search green” lists. There are others like Ecosia, Beluga, Ecoogler, Ecogine etc. too. For example Ecosia has about 100 000 users, but it still manages to donate 80% of all income that it has (advertising money) to enviromental purposes. If it is possible to build and maintain search engine that even for such a small amount of users (less than 100 000 search engine users) is so profitable that it can donate 80 - 90% of its income to other uses, such a simple search engine (opposite to Google which runs billon-dollar business with its supercomputers etc.) could be used in zeronet / toll free internet to reduce its search engine / server costs. And if a search engine can donate 80 -90% of its income to other purposes, in this case it`s for maintaining a toll free internet / zeronet. And if toll-free internet has about 5 billion users that means that same kind of cheap search engine system can donate about 99 - 95% of its total income to maintaining zeronet infrastructure. If a distributed search engine is used all 100% of income from search engine will be donated to zeronet, but distributed search engines has usability etc. issues so it is unclear can those be used in toll free net, altough some like Dooble (in its first, distributed form) are very sophisticated.
And other use for regular cheap feature phone: a musical instrument. There is a text " Design of a scalable-polyphony MIDI synthesizer for a low cost DSP" by Antti Huovilainen. He uses VLSI Solutions VS 1003 chip. Another design in netpage instructables.com " VS 1103 MIDI synthesizer" uses similar chip, but design is more complicated. Those chips are ordinary MP3 player logic circuits that can be found in every cell phone, even in cheapest models. Using only one (?) extra filter Huovilainen
s design achieves to build hardware synth on a MP3 player circuit. Because design is so simple and ads very little to existing circuitry those kind of hardware synths for music making can be added very simply to cheap feature phone. Huovilainen writes that perhaps ADPCM-modulation that brings reduction in bitrate is suitable for the design, and in netpage bitsnbites.eu is a "High quality DPCM" or Dynamic DPCM, simple and efficient modulation technique for sound that perhaps down to 3 bits (8 numerical values) or less, is suitable for synthetised sound. Yamaha manufactures sound chips for phones, like does french factory called Dream. Yamaha makes vocaloid sound chips and vocaloid technology is developed by Yamaha. Vocaloid could be used as good quality speech synth in phones for those who cant read or write. Unfortunately only most comprehensive and expensive sound chip comes with vocaloid. If Yamaha could offer vocaloid also in cheapest sound chip that can be installed in cheap feature phone that good quality speech synth can be put to good use. Vocaloid is used to imitate singing voice but can be used as speech synth too. And Yamaha
s sound chips can be used as musical isntruments (music hardware synth) also. Music synths are being offered in Android but they are software synths. If synth is in hardware, processor and memory usage can be saved. If only slight alteretation in phones MP3 player is needed to turn it as a hardware synth, or a cheap sound chip with vocaloid technology added to cheap feature phone, both good quality speech synth and music synth can be added to phones functions, almost without extra costs. The sound chips in phones are normally used as ringtones etc. but they can be used as musical instruments (multiple polyphony voices musical synth) etc.
Altough Android is de facto standard, different web apps must be developed in different platforms anyway. And for the same platform there are multiple bookmarking tools etc. that are unnecessary as only one is needed etc. To overcome this different methods that have remained in theoretical level has been developed, Google Web Intents, and Mozilla Web Actions & Web Activities. There is Phonegap Build for app development and distribution, proposed Webinos standard, and Docker, for unified web framework. Those unified structures instead of multiple formats that are now blooming in internet may offer simplicity and reduce bandwith, if data is going to be transferred cheaply.
The so-called internet of things has many different standards that have date rates up to several megabits / second and some even 100 Mb/sec “burst rates” for peak performance. Also ranges vary from metres to over 10 km (most IoT standards achieve this 10 km or more range, several kilometres is normal at IoT). 10 km is normal GSM range in non-rural enviroment from link to phone. So IoT achieves GSM- class range, but is optimized for cheap data transmission (cost for teleoperaor is minimal per IoT device than cost to connect telephone, tablet PC etc.), and cheap chipsets. Data rates also are similiar to older GSM standards. Longest range (50km) is in Sigfox IoT standard but data rates are also lowest (1 Kb/ second). Standards such as 6Lowpan / LoRaWAN, new Narrow Band IoT, LTE-M, NB-LTE, NB-LT-M, and EC-GSM rel.13 (from 2016 onwards), are coming, and NB-IoT is the chosen standard for IoT devices. But which is the best of these myriad IoT standards for toll free net communication for development countries? Bluetooth is in its long range low energy / Bluetooth Smart version capable of 100 km or more range (Gotenna). That toll-free telecommunication should allow people in poor countries have cost free net connection with some usable bandwith but without cost to end user. If range and data rates that allow people to have almost normal telecommunication like nowadays low end GSM phone standards or GSM standards about 10 years ago, and internet connection but only fraction of cost that would allow advertsement paid free net in developing countries. About 20 years a go there was less than 20 kilobits/sec avarage GSM data rate but still for example streaming media with sound and video picture together was possible, using that 20 years old technology. Sound codecs optimised for low bitrates like QDesign Audio codec which had minimum 5 kilobits/sec for usable sound (music) and video codecs optimised for low bitrates. And that was already 20 years ago, at least video codecs have been developed further what they were then. New audio codecs such as MPEG 4 Structured Audio, MPEG 7, or Seer Systems Seer Music codec (1998) are very sophisticated and require much of hardware, such as own music synth directly on the receiving device (phone etc.), but they compress musical content down to a few kilobit/sec level.Standard telephone audio codec AMR is also best audio codec for music at very low bitrates (about 20 kilobits/sec) if AMR Wide Band is used, studies of low-bitrate audio codecs have shown that. Also a new Linux distribution Solu OS is aimed for multiuser (shared) net connection but is also same time a cloud-based OS which enables it to be in cheap devices. Its shared nature is perhaps suitable for mobile ad hoc networks etc. but at same time its centralized cloud based nature requires central server, which is opposite to distributed networks. And Dooble browser in its original form was distributed search engine / browser also, but is not anymore. If any technology like this makes net connection to low costs these can be used in toll free net in development countries.
And printed electronics, which is becoming suitable for internet of things ceap devices, RFID technology etc, anything that allows simple electronics for IoT, is also possible in toll free net devices if they use same data transmission standards and chipsets. So using IoT technology for data transmission cheapens data transmission costs, and also cheapens cost of electronics (close to zero per device if printed electronics is used). But at the same time ordinary telecommunication techniques are making toll free net possible also, because advertisement money has increased each year etc. Also ordinary electronics is today so cheap, only few dollars for a feature phone chipset system-on- a chip. Altough toll free net with its restricted data rates etc. is not perhaps suitable in industrial countries, in developing countries it has great demand, using IoT or other cheap data technology.
The cost of electronics is not anymore manufacturing costs, they are minimal for integrated circuit now, but the cost of the manufacturing licence per device. Electronics are full of many licence fees, and that makes the cost of a device, not the cost of manufacturing. There are open source electronic projects, but to use them some kind of licence and royalty payment, if its gonna be used in commercial purposes, exists and must be paid. Examples can be found in opencircuits.com, open-electronics.com, opencores.org and openfpga.org -pages. There are system on a chip open source projects, and radio frequency component design and other like DSP and DDS (direct digital synthesis) for open source versions of radio frequency components. There is a complete phone (Tuxphone/Openmoko) that is open source. But question is not is it open source, but is it cheap or free from licence/royalty payments. The SuperH (Hitachi) processor core is in public domain and is now called J-2, J-3 or J-4, and is licence free, and has attanained a lot of interest, one processor costs only 0.03 dollars to manufacture, so for super-cheap phones/devices it is a candidate. Consider this to 5 - 10 dollar price of commercial processor so 0,03 dollars is huge improvement. Chip foundry takes its own profit however anyway, so price would be higher than 0,03 dollars for processor. The “thumb instruction set” for cheap ARM- processor is similar to SuperH. When suitable electronic components are not found, and device needs lots of different components, it often requires FPGA (field programmable gate array implementation), but they are closed source and expensive. Some small FPGA companies offer open source for their design but they are not licence payment free. There is Papilio board -project and Cubic Board for more or less open FPGA. Also Archipelago project for independent FPGA that is not build by commercial company but open source community exists. Building a super cheap device requires almost no-cost licence/royalty payments. There is netpage “Softcores for FPGAs: the open source alternatives”. So public domain electronics (electronic circuit design has a 20 year time before it enters public domain?) are needed or something with very small licence costs like Beyond Semi`s ARM processor with one payment / licence payment free model. Device should be built using these licence free / minimal license fee components for manufacturing complete super cheap feature phone or tablet PC, or using licence free / almost license free FPGA in the SoC if suitable components are not found as licence free / minimal licence fee versions. This will make one dollar feature phone / tablet PC for developing countries and for toll free internet / zeronet.
One way to exploit old electronic “legacy” integrated circuit designs of 20 years or more old, is for example in the case of CPU grouping several dozens them in a grid in one silicon chip. J2 (Super H) CPU is manufactured at 180 nanometer process, but if 64 (8x8) of them are grouped in a grid with connections between, in one 22 - 28 nanometer process silicon chip that compensates the low transistor count and slowness of old design, and silicon chip die area is about the same. Making chips smaller increases speed and reduces electric consumption, 20 year old designs have low transistor count but combining many old processors together in one multi-processor chip compensates this. These 20 years old processor designs are in public domain (?). So no licenses must be paid. Smaller 4x4 (16 processor) and larger than 64 processor grids in one monolithic silicon chip can be also used. Also when licences are elimininated other ways to cheapen end product can be used. For example if is possible to manufacture batteries and displays using printed electronics (prototypes are already being made) the rest of the phone / tablet PC electronics could be in typical silicon chip SoC with processor and radio frequency electronics, but battery and display is made by printed electronics. Display could be small, low resolution low quality, perhaps black and white or two-colour system like old colour negative film prints (instead of three colour). Even magnetic memory can be manufactured using printed electronics, altough only prototypes have been made. Super H (J2, J3, J4) is the processor that has caused interest, but russian 512 bit VLIW processor Elbrus has been manufactured since 1986, and it can run Linux and Windows. When Elbrus 2000 appeared it was claimed to be faster than Intel Itanium, but at very low transistor count ( I remember 90 million transistors ? was the claim), and chip was manufactured already old fashioned manufacturing process. Elbrus team worked with Sun systems and latel Intel, and design owes something that is common to SunSPARC, Transmeta Crusoe, and Intel Xeon. SPARC is open source and Elbrus team was developing it also. Only other VLIW processor in manufacture is Fujitsu FR-V, from 1999 but based on 1980
s design, and FR-V is now discontinued (?) and replaced by ARM processor version. VLIW technique makes very efficient processor possible, enormous amount of theoretical research work have been done in decades but only those two processor have made it to mass production. Elbrus 2000 is from 2005 but basic design is from 1986 and in between these years some improvoments in basic design were made. So minimal transistor count but still fast and effective processor is VLIWs advantage. New and perhaps better conceps than VLIW have appeared but these two are old (20 years or older) designs and were in mass production. Cheap phone can be accompanied by solar panel, made by printed electrincs and charger for phone. If it is not possible to build feature phone without licence fee for electronics, perhaps then it is possible to have lower license fee for such a cheap “charity phone” that is paid by advertisement money like toll free net connection that comes with the phone, and phone is distrubuted without cost to people in developing countries who have not yet internet connection. Because phone is so cheap it can be given for free and paid by adverstisng money. But lower licence costs for electronic component or license free components are required. ARM Holdings Plc. has Linaro concept and collaboration for open source, perhaps that is the way to obtain cheaper ARM licenses for free “charity phones” with free internet connection. Any cheap technology will do, ARM processor, Intel Atom or even Quark, operation system Symbian (early version) or Maemo Linux or simplified Android like Google Brillo or Android 1 (only 32 + 32 MB memory) and simplified GUI. Internet of things internet protocol etc. that is data efficent and fast for transmission etc. If cheap licenses for processors are not obtained, then any FPGA, CPLD, ASIC will do as processor or SoC of the phone / tablet that is license free or minimal license.
Also chip foundries take their profit, but they can lower their payment rates because they now can increase production to billions of chips in this kind of “charity electronics” that is advertisement money paid and given free to people in developing countries, and high volume production (billions of standardised cheap chipsets) compensates lower profit per chip. And for lowering data rate costs for free internet: data compression techniques. For video there is new Screaming HD video compression, for images MyPhotoZip, for audio there has not been in decades a codec that is optimized for very low bitrates (few / dozens kilobytes sec.) after Qdesign Audio codec 20 years ago. Ogg Opus is speech and music unified codec that ca be used in phone in those two functions and begins with 2 kilobits/sec but is not optimised at very low bitrates (music codec of Opus). For development at text compression there is article “Towards efficient compression techniques for different types of source data”, J. Parikh 2014, and not only text compression, like StarNewTransform StarNT. For other compression like file compression there is SquashFS and NxServLiv for Linux, MFFM BitStream, Complearn NCD (complearn.org/ncd.html), Word Replacing Transform (“Fast transform for effective XML compression”, Premyslaw Skibinski. Other: CleanZipAndGo (Dominique Doucet), article at reddit.com: (Sloot digital coding system - " A revolutionary advance in data transmission…"), a holodynamic compression etc. For image texture compression: S3TC - BOXEN texture tool, BISQWIT: Arbitrary-palette positional dithering algorithm. For manufacturing cheap or open source lectronics there is Qi Electronics “copyleft” and its Ben Nanonote. But otherwise there is very little to be found about public domain / copyleft electronic components, on netpage “Public domain electronic resources” there is access to some blueprints but database or “marketplace” for public domain / license free electronic (old) components and their availability and places to purchase them is nowhere to be found. There is OpenPhoenux.org, and other such as Novena laptop that are open source (but not license payment free for commercial use, only Ben Nanonote is). Letux tablet PC and GTA04 phone are modern derivates of Tuxphone / Openmoko projects, and so is Phone Bloks modular phone. Those open source laptops use FPGA inside (Xilinx) that is neither open source nor license free. Free “charity phone” that is built using either license payment free electronics or very low license fee electronics and that is as cheap as possible feature phone / tablet PC, and given away free together with free internet connection and phone and net connection is totally advertisement paid, can be built, but it perhaps requires refinement of nowadays electric component licenses and chip foundry prices. This “charity phone” can have different license and manufacturing fees and specs than “normal” phone. If its gonna be totally profit free, or complete charity product that only manufacturing costs are covered and no profit goes to manufacturers, then perhaps same kind of thing that makes donations to charity tax free can be applied to these electronic “charity devices” and their manufacturers. - There is more posts about this subject under title “More about free internet in development countries”, but they continue at Robin Hood forums, latest posts can be found under “latest” posts at Robin Hood forums.
Chinese factories are making cheap voice regocnition chips, different models and types, for phones and other electronic equipment. These are very cheap, for bulk orders price is less than one dollar in most cases (or as little as 0,1 dollar for large order). These cheap voice recognition chips are suitable for cheap phones in development countries for people who cannot read or write. If cheap voice synth chips that imitate human voice also exists those chips can also be included in cheap phones. But only Yamaha NSX-39 is known to me so possible softsynth that uses phone
s memory and central processor is best for human voice synth. And using phone as musical instrument: earlier in the 2000s very small memory/ processor requirement music softsynts for ringtones etc. were offered for phones (few dozen kilobytes of memory was needed for music softsynth). Now these (dozens different existed about 10 - 15 years ago) are obsolete and not used anymore. These mobile phone music synths with low processor and memory footprint can be used as musical instruments in cheap phones. Nowadays voice recognition chips for phones (Cyberworkshop Hong Kong), video processors accelerators for phones (FTDI) and screen control chips for phones (Sensory.com) all have their own music synth included in their chips (microcontrollers inside the phone). The special music synth chips for phones used 10 years ago have become obsolete and not used anymore, only Yamaha SMAF and Dream (before Atmel SAM) exist still, others are not in production anymore (there were about dozen manufactures, including NEC, and others were mainly chinese factories like Vimicro, and Oki, which is japenese factory, etc.). These obsolete synth sound chips can be used still in very cheap mobile phones, not for ringtones but as general musical instrument. And for more expensive phones, if all three microcontrollers that phone have (screen control, video accelerator and touchscreen control) have own music synth, and if Yamaha or Dream chip is also included, that makes maximum of four different hardware synths in one mobile phone, (not counting possible softsynths in phone´s memory). If the MP3 player of the phone is constructed like in the paper “Design for a scalable polyphony - MIDI synthesizer for a low cost DSP” by Antti Huovilainen in 2010, so that MP3 player is also a wavetable music synth, that rises hardware synths inside the phone to total of five. These maximum of five hardware synths will propably turn expensive mobile phone a powerful music making machine, if all five are being used simultaneusly. And about cheap musical instrument: chinese factories make cheap toy keyboards that are priced from 2-3 dollars (cheapest models), about 37 key- instrument, to about 5-6 to 10 dollars and little more (49 to 54 and more keys keyboard). These toy keyboards look like professional synths of the 80
s, but inside they have electronics of toy musical instrument. Even touch response keyboards (polyphonic aftertouch) are for sale beginning about 20 - 30 dollars. Most of those cheap chinese keyboards (there are dozens or hundreads manufacturers and about one thousand or more different models) have USB MIDI connection. These prices are in alibaba.com and other chinese netshops for factory order of 1 - 100 pieces, or several hundread pieces factory order. At same time in china is for sale old soundcards (new factory production of obsolete electronics) about 20 year old technology, Sound Blaster etc., with their synth sound chips that are old Ensoniq, EMU, Creative, Creamware, Crystal Semiconductor CS9236, Yamaha, and Roland LA32, even old Casio (NEC) sound chips from 20 year ago or more (in Casio synths of the era) are still in production in China, or production will began if they are ordered. Mainly PC sound card chips and old style sound cards are found but also old synth keyboard chips (20 years or more old models) are offered. Old sound cards with their music synth chips have price range starting from 1- 2 dolllars upward for large factory order, and separate old synth chips are in the same 1-5 dollar price region. Why not using old soundcards / chips inside those professional synth looking toy electric keybooards, and turn those keyboards to real pro musical instruments, that has only 5- 10 dollar factory price at cheapest. Even models with working microphone are offered at 5 - 10 dollars so sound source sampling through mike is possible and keyboards with USB MIDI connection have price range of little over 10 dollars to starting at 20 dollars prices. So USB MIDI keyboard with working microphone, or polyphonic aftertouch is possible at about 10 - 20 dollar factory price. Inside those cheap keyboards would be old PC sound card, or old synth chip with associate DAC chip etc, or synth- on - a chip (all in one chip) modern Yamaha SMAF or Dream chip, whose prices are also low. Also microcontreller based solutions like Arduino, Raspberry Pi and PIC have gainned popularity, but when these designs are sold commercially their prices are over 100 dollars per piece for music synth application. Altough they are based on very low price microcontrollers they are manufactured small batches handmade, not in mass production. Instead of small batches of handmade pieces if they would be made mass production techniques and sold to thousands or million pieces in some bazaar in poor country their price would be only few dollars that is close to their bill of material costs. So if the open source community manufacturers would concentrate on mass production (using some chinese OEM factory) instead of handmade small batches these otherwise cheap synths, they could sell millions of them in development countries. Some solutions that are primitive Pico microcontreller based could be grouped to one PCB board (16 - 32 microcontrollers) and associate electronics and sold them as one piece of equipment music synth with 16 - 32 synth engines. Same perhaps is possible Atmega 2560, Raspberry Pi 3 and more powerful PIC microcontrollers. The C.H.I.P microcomputer also has some music applications. Also printed electronics is coming, one raport states that all investments to printed electronics China has 12% and India 6% stake. In india are firms like Keetronics that already offer printed batteries and displays. In Youtube there is video clips of "midi paper", midi controller made of paper, and "piano paper box" by Catarina Mota , a keyboard controller. In Netherlands Macdonalds offers free midi controller with meal, this "MacTrax midi controller" is manufactured using conductive ink, and is connected to smartphone (or feature phone). This is offered in industrial country (Netherlands), not in some poor country where it would be instant hit product, altough it would have be sold at some small price (and not given away free). If printed electronics is used in something like telephone, using simple solutions, perhaps ARM0 processor cores (less than 12 000 logic gates), and then grouping them to 100 core (EZchips) or more clusters like ARM MPcore, if working processor is built using printed electronics. Micro SD cards are so cheap that they can be used as mass memory, batteries and display is printed electronics too and radio frequency communacation using Internet of things low data rate protocols (with substantial data compression) if telephone is to be made using printed electronics (roll type "paper printing manufacturing" plastic electronics). If printed electronics is used for musical instrument manufacturing, old digital synth chips like Yamaha Dx7 and Casio/NEC, old Yamaha PC sound card synth chips (1980s) etc. are candidates for first products. If analogue electronics is made using roll printing then old Curtis and SSM sound chips in analogue synths are candidates for first products.
An example of useful technologies that toll free internet might use is Inetsat and Clinixon, both from Uruguay. Inetsat transfers TV content at price of only fraction of satellite transmisson worldwide and Clinixon is health monitoring app for medical patients because Uruguay have in countryside hospitals far in between. These are examples of locally developed third world solutions developed at third world and designed for their own local needs, not outside developed and then imported to some underdeveloped country internet or technology solutions that are around the world today. Also in the USA is a new internet app called “puggle.me”, it is in Github so it is perhaps in design stage. Its purpose is to minimize internet costs when using internet browsing by choosing cheapest option for search results. In most minimal form it send search results to mobile phone using SMS text messages to minimize cost. It uses Bing as as a search engine and Phantom JS as web page scanner and special database cache to improve efficiency. That puggle.me technology is most suitable for development countries and their internet, because cheapest technological solutions for end user are needed there, and in internet technology paricularly.
And about musical instruments: Yamaha sound chips in their modern LSI sound generator line have digital single chip amplifiers that have maximum output of 2x30W, and some models like YDA 156 and YDA 174 have inbuilt synth engine and DSP too with equalizer and mixer. These models can be used as single chip keyboards and amplifiers, keybord could have equalizer and mixer in the keyboard layout together with normal keyboard functions. If the same keybord is fitted with loudspeakers, either electrostatic thin type speaker (or two speakers for stereo output) or 1-2 normal box- like loudspeakers, with 2x10W - 2x30W max power or more (so the speaker won
t get sound distortion if the amp is in its maximum setting when the speaker has power requirement higher than amp) the keyboard can be used not only keyboard synth, but also as a live mixing console and loudspeaker combo, so performing band doesnt have to buy separate live mixer console and loudspeakers. The keyboard can be then used as guitar amp etc., and as guitar synthesizer etc. All those functions are in one chip, whose price is low. When electrostatic thin speakers are used the keyboard look like a laptop PC, the cover of the instrument is the speaker and turned towards audience when played. There are other Yamaha chips with built-in speakers, including the whole mobile phone sound synth chip product line (YMW line, and YMW 820 etc). These low power speakers inside synth chip could be used in super cheap keyboards like chinese toy keaboards with 37 key layout etc. They have inbuilt speaker and opamp in the sound chip itself so no speaker is needed in the keyboard. Due to low sound volume of these in-chip loudspeakers sound chips sould be placed near the surface of the keyboard and “horn” acoustic structure that is common in discant section of ordinary “box” loudspeakers installed over soundchip to amplife sound. Price can be in some third world bazaar be as low as 5 - 7 dollars per one keyboard with all-in-one sound chip. If there is no chance for midi in or out connection on the keyboard, perhaps CV/gate control is possible. Model Yamaha YMF 825 has inbuilt 0,9W speaker. Also grouping these cheap synth chips more than one in one PCB board, for example if 8 or 10 chips would be inside one keyboard every finger would have its own synth engine, so pressing the separate key of the keyboard triggers separate synth engine and combined polyphony could be over 1000 voices, if Yamaha or Dream chips are used. Price would still be very low, about a couple dozen dollars for cheap chinese OEM product. For non-digital devices techniques like Portable Oscillator (PortOSC) by Petri Huhtala, Olegtron 14-bit chips driving old 12-14 bit analog/digital synth patches etc. can be used. Using old Yamaha YMF 292 chip with its flexible sound routing together with modern amp/DSP synth chip etc. And using other old chips like Roland 32, NEC uPD9990 mobile phone chips and earlier NEC series (NEC chips were used at Casio keyboards 1980s/90s), Ensoniq OTTO, EMU, Crystal Semiconductor CS9236 etc. In fact it is possible to build a"vintage synth collection" in one PCB board using those old chips together in one board, and its price will still be very low, about few dozen dollars when mass produced in large quantities, including associate DAC chips etc. required on the board. Those old chips 20 ears ago are still in production in China (or Mexico or Indonesia), as are old PC souncards that include those chips. Almost every integrated circuit that was in production 20 years ago is still in production in those three countries.Prices are very low. Most succesful keyboard in history is yamaha DX7 with over 100 000 produced. But using nowadays cheap technology is possible to build cheap keyboard with prices starting from 5 dollars upwards that give same capabilities, and sell it millions of pieces, perhaps hundreads of millions if its price is low. If Yamaha DX was success with 100 000 sold, if some keyboard is sold 100 million units, and brings to its maker one dollar per unit profit, in the end keybard maker makes exponentially more money than selling elitistic keyboards at high prices to customers (Yamaha Reface series is example of such elitism). However, selling low-end cheap products straight to bazaars of development countries in volume of millions would bring much more profit (chinese keyboard manufactures have noticed that), and selling microcontroller based synths at hundreads of euros built one piece at time handmade (that commercial Arduino and Raspberry Pi synth makers are doing) is strange when they could sell millions of the same devices at low price/ large volume in development countries and earn much more money than they are doing now. There are FPGA based designs that open source community has been doing for past 20 years, some are academic projects, other are hobby projects, and now over 100 FPGA synth designs are available. None of these over 100 different FPGA synth designs is in actual mass production. Those few that are in “production” by commercialized open source firms are handbuild one piece at time, and price is several hundread dollars per piece, altough using chinese OEM factories and mass production price would be only few dollars when using old FPGA designs 20 years ago. FPGA offers powerful sound making tool (Juergen Schumachers
s over 8000 voice synth in 96khz.org). Xilinx designs such as XC4000, XC5000 and XC6200 series are over 20 years old, so cheap chinese OEM production of these old designs is propably available, and Virtex 1 and Spartan 1 dates from november 1997 about. Most of FPGA synths are Spartan 3 based, and Spartan is older Xilinx FPGA based from the 1990s Xilinx designs. So super cheap FPGA synth that uses chinese OEM production is possible, price would be only few dollars in mass production (whole synth board PCB) when old model FPGA chips are used. Several old model FPGA chips can be grouped to one board if that is cheaper than one modern FPGA, or several old and simple FPGA “kernels” grouped to one silicon chip. There are over 100 FPGA synth designs/ concepts to choose if someone would just start making them in large scale and low price. Or using Papilio board open source FPGA, or Archipelago which is open source academic FPGA project, or Atmel FPSLIC (like Arduino) or other modern but cheap solution. Other open source FPGAs are XESS XULA-200, Beagle Bone SDR, and Numato Opsis, all three based on Xilinx and last one is from India. CubicBoard is Altera design, Ztex FPGAs are open source also, and IceStorm is Lattice design. Based on OpenRISC 1000 is Dyna Lith System INCITE FPGA, and OR32-1208 ORSoC is ASIC version of OpenRISC 1000. Opencores.org is full of different DSP designs. Most open source FPGA synths are Xilinx or Altera based, but perhaps Achronix Speedster offers more capability, such as running over 800 processor cores simultaneusly and then running 800 softsynths or synth engines simultaneusly in one chip. Kalray CPU is capable running 256 cores simultaneysly and it is cheap and power efficient chip, but very high computational power (for its cheap price). The new Mill CPU is based on ideas of old Philips Trimedia processor, and Trimedia has Linux ported open source OS (called TMlinux), and Trimedia is old processor family beginning in 1988. Hitachi SuperH CPUs are coming to complete open source public domain (no license fees anymore), SuperH4 / J Core 4 in 2016. These have super efficient code density, the same code is used on ARM microcontrollers, and SuperH was used in Korg, Yamaha and Roland synths in 1990s but as keyboard scanning etc.duties. Renesas MCU16 was used in the synths also. There is Parallax Propeller multicore open source microcontroller, and PULP (Parallel Ultra - Low Processor Platform) and its Pulpino version. STMicrolectronics has its microcontroller as open source, and its another microcontroller ST-200 VLIW has MPE VLIW processor in opencores.org and at Delft university p-VEX and r-VEX open source versions. At opencores.org is starnge “256 bit CPU” that has 32 bit instruction set but 256 bit Arithmetic Logic Unit. In opencores.org is also free implementation of PIC 5-series microcontroller, so it possible to to have it in FPGA version (many microcontrollers on one cheap chinese Xilinx clone FPGA) like ARM and Atmel microcontroller cores have softcores also. Grouping many of these softcores to one 1 dollars in one FPGA will make super cheap Arduino / Raspberry PI / PIC project “collection” in one chip. Old Texas Instruments TMS320 chips are cheap now when chinese OEM production is used. Year 2000 Korg OASYS Pc card cost 2000 dollars and OASYS keyboard 8500 dollars. Now it is possible to build keyboard that outward look like Korg OASYS using chinese OEM keyboard and inside put those 5 TMS320 DSPs that PC card version had, and sell this keyboard about the price of 50 dollars, and functionality is like OASYS PC card. Olimex also sells Rockchip and Allwinner based cheap open source development boards (ARM).Anadigm FPAA (Field Programmable Analog Array) is sold at the price of about 5 dollars a piece for 1000 piece order, and is used at Clavia Nord Modular “G3” in 2009 that never went into production together with Xilinx FPGA. Also Sonoric Instruments designed synth using Anadignm FPAAs in 2006 that went not into production either. These are real analogue (not digital) sound processings. Nord Modular prototype used them in 32 voice reroutable synth voices per FPAA and FPGA as digital oscillators. Modern open source DSP examples are freedsp.cc, OWL open source DSP, Mako DSP, FreeDSP (Merhec 2014) and “ePUMA: Embedded parallel DSP processor architechture with unique memory access”, together with its eSORT algorithm. For optimizing DSP can Goertzel algorithm be useful etc. There are multicore and microprocessor projects like OpenRISC2000, OpenSPARC, RotorCPU, Mozilla Servo / Rust, OpenAMP, OpenPITON, Manycore research framework ALMA, Skeleton programming framework SKEPU, commercial solutions like Cavium Octeon, Toppers/FMP, and Adapteva Parallela board. For DSP there is Magnolia DSP 2015, and “Implementing and optimizing of the entire system toolkit of VLIW DSP” .But question is not are they open source or not but are they cheap or expensive, and only cheapest technology is needed to cheap instruments that are to be sold in development countries. And old DSP chips from synths like Creamware / SCOPE audio Pulsar / Noah, Soundart Chameleon and Creamware/ SCOPE Audio Supercomputer that used old SHARC chips etc that are still in production in china at cheap price, modern versions of these 20 year old high end designs (Audio Supercomputer cost about 40 000 dollars and none were sold) can be built in just few dozen dollars / few hundred dollars when faithfully duplicating their original layout (old SHARC / processor chips 20 year old models etc.), because their microchips are outdated and price of those chips 20 years later is so low, still found in production in some chinese factories. And about midi controllers: 20 years ago there were concepts like Buchla Thunder/ Lightning/ Wind, and Tactex Control MTC Express, Kurzweill Expressionmate, multi - voice theremin by John Rigg (12-voice theremin), STEIM Sensorlab, EMS Soundbeam, Wave Idea Bitstream Pro, Interactive Light Body Harp and Dimension Beam (now Roland), Optivideotone by prof. Scott F. Hall, Matthews Radio Baton (Radiodrum), Interactive Entertainment Synth - a- Beam, Vivid Group Mandala VR System, Infusion i-cube (now called audiocubes), MMB Music MidiCreator, GestureCreator and SensorCreator (University of York). Now 20 years later only Audiocubes, and things like Haken Continuum are still in production, EMS Soundbeam is not used as music making anymore, and others have been forgotten. If some chinese factory makes cheap OEM versions of those old concepts, expensive 20 years ago but cheap when using todays cheap effective microprocessors, and for a price of only few dozen dollars (that is possible because those concepts are 20 year old now) that would offer cheap MIDI interfaces that are also highly developed. To poor people for musicmaking. And using cheap analogue synths: if they are being build using cheap components, they do not stay in tune, like Mexico- build Hard- Mod synths made with cheap components. In order to improve this digital oscillators are needed in cheap analogue gear. If it is possible to use only oscillators in cheap synth-on a -chip, like Dream synth chip or EMU 8030, and have oscillator Midi out connection (it is possible perhaps use these chips norman Midi out connections to only oscillators) they would provide cheap digital oscillators to cheap analogue synths, Dream chips have max 256 voices and Emu 8030 128, so they have over hundread of oscillators. If for example modular synth have maximum of 8 voices, over 100 or several hundread oscillators is huge improvement, and digital oscillators are more stable than analogue. If not PortOSC (portable oscillator) by Petri Huhtala, simplified digital oscillator / analogue synth solution, is used.
Might I suggest posting messages that are a little more concise. It seems that you have a lot you wish to talk about but when other people encounter a wall of text it can be intimidating to either read the entire post and/or respond to all the points mentioned. A blog would lend itself better to longform content.
Keep up the passion for sharing though!
If it is possible to build Korg OASYS clone for 50 - 70 dollar retail price using cheap chinese 4 x TMS320 OEM production (old model chips, about 20 year ago, still in production in China) and 1 x microcontroller CPU and cheap chinese toy keyboard / electronic organ which has touch response keyboard, then even more cheaper would be clone of Clavia Nord Modular / Micro Modular using same TMS320 chips and Olimex TMS430 board as dev board (with TMS320 chips). If Korg or Clavia themselves just would make cheap keyboards for third world markets using these principles and cheap circuits. Atmel (Arduino) has many softcore versions that can be implemented on FPGA (Xilinx etc.) Old Xilinx FPGAs are sold in china about one dollar per chip (4000 / 5000 / 6200 series) so many Arduino projects (music synths etc.) can be implemented together in one 1 dollar FPGA chip making super cheap synths and other electronic Arduino projects possible, all different projects in one chip, at least old Arduino projects about 5 - 10 year ago that require less resources (computation time, memory etc.) Earlier simple PIC microcontrollers perhaps can be in softcore too. For effective hybrid synth (digital oscillator analog filter) perhaps mutant vactrol filter will do. And synths in the midi cable like DSP plug G1 (Jan Ostman), Mixtela and Midivamp, and Roman Sowa designs that are super cheap to manufacture are suitable for third world market and are cheap microcontroller based. For synths sound frequency over 7 - 10 khz is not needed because High Frequency Huey coding and Sub Band Replication (SBR) can reproduce high frequencies in the end 2 channel stereo mix or 4 -6 channel surround mix. Nowadays more efficient than SBR or huey coding audio High Frequency Reproduction (HFR) or audio High Frequency Replication (HFR) techniques are available, several different ones, that are either extensions of previous (SBR) formats or completely new ones. The patents of Fredrik Henn and writings of Tomasz Zernicki are perhaps latest in this state -of the-art development. all those HFR techniques require minimum of 7khz frequency (or 4khz is the minimum, and 10 khz the maximum needed), so sampling frequency can be limited to 14 Khz (or 16 Khz if that is more suitable), so synths can have more voices / processing power but effect in actual sound that is heared is minimal because used sounds that synths generate are electronic and “unnatural” anyway, and all high frequencies are generated using high frequency reproduction in the final 2 - 6 channel mix. Also cheap digital synths (Arduino, Raspberry Pi) need same kind of system that is in use analogue Eurorack world, one unified standard for modular cheap synths. Eurorack synths have “synth voices”, non-modular single unit synths together with modular versions, and desktop synths have Eurorack versions for modular use. Same principle can be used in Arduino / Raspberry Pi DIY synth world, together with “desktop” versions of nowadays microcontroller based synths can be universal standard for modular rack form (or form like emSynth Miniature Synth, Patchblocks, Bastl Instruments Trinity, etc.). There are Axoloti, Arduino Uno, RCduino, Lush One, Niklas Roy Micro Monster Modular, and analogue versions like Caspar Electronics Mini Modular, but common form factor for semimodular, modular and single synth voice (like Eurorack) is missing in DIY microcontroller synth world. Like desktop synths are turned into Eurorack form, microcontreller synths can be sold as desktop form and “microrack” like Erica Synths Picorack. The form factor of Eurorack is perhaps too big for microcontroller synths, emSynth, Patchblocs etc. can be more cost effective. One attemp for digital modular is FluorumLabs SonicTrain (Artem Godin) that combine both analogue and digital signal paths. Also net- based synths or web- based synths, that are mostly free are offered in rich countries, but in poor countries, perhaps with limited graphical user interface they can be useful, less graphic keep data rates low and because they are web based music making tools they don t consume end user s resources like memory that free soft synths do. Different microcontrellers (Arduino is Atmega, Raspberry Pi is ARM, there is Intel Edison that has x86 inside etc.) propably has intreoperability problems so perhaps different microcontroller architechtures are not interoperable, but still they can be all grouped in one “rack form” if they are gonna be rack mounted, or otherwise chained like Patchblocs etc, then the chain form and standard for chaining would be universal. Communication would be digital between devices (Internet of Things communication standard, or Ethernet, or “raw digital data” etc.), using CopperLan or other cable (if cable connections are used, and CopperLan uses standard telephone cable, because distance is short, only few centimetres, perhaps 100 megabits / second is data rate). The multi- channel music (perhaps several hundread channels of synth sound) and midi data is flowing through the chained synths, or only midi data itself. If connections are direct without cable then emSynth or something like that. Even radio frequency communication (Wifi, Bluetooth, NFC, Internet of Things communication protocols etc.) can be possible between synth devices, and music itself (several hundread channels of synth sound) can be transferred between devices using radio waves. Acrobotic Sound Synthesizer Kit is using Direct Digital Synthesis for sound and microcontroller so that is the most cost effective (but not perhaps best sound quality). And using analogue electronics combined microcontroller oscillator and analogue filter is an option so perhaps room for analog circuits (and analog signal path between devices?) in the “rack mount” is perhaps suitable. There are tons of analogue electronic waste discarded each year, collecting used electronic parts and recycling to new devices both helps waste problem and brings cost of electronics down. One example is Verde Audio, making “high tech” from scrapyard parts. If someone would just began manufacturing large scale mass production using old used analogue electronic components that are otherwise electronic waste, price of devices would be very low and suitable for development countries market. Of course guarantee is impossible because old electronics can broke down anytime, but perhaps changing potentiometers for new ones (old electronics manufactured before mid 1980s broke down because of weak potentiometers) improve quality. Analogue synths, radios etc. (and digital equipment using digital old components that are otherwise going to scrap) using scrapyard components is possible to manufacture. If factory is in development country near electronic waste depot production costs would be very low. Nowadays cheap printed electronics are in use, for example Macdonalds Mactrax midi controller, EJTech (Hungary), Novalia (England), Touch Board, O.System (RCA), SketchSynth (Billy Keyes). But those printed electronic products are not designed for, nor they are sold in development countries, where they could sell them millions of pieces. In rich countries people don
t need few dollar price primitive midicontroller, so they are low interest niche products, but in poor countries cheap tech like printed electronics midi controller would be a hit product. And ideas like microtonal keyboards with almost 1000 keys manufactured using printed electronics etc. 20 years ago there was Sony "Super Bit Mapping" for increasing 16 bit precision audio to 22 bits (theoretcally) per herz, and that does not require special decoder, without decoder SBM audio sound like normal 16 bit audio. Lowest quality audio that is listenable is 6 bit, old drummachines and samplers used 6 bit audio. If AMR telephone audio codec would have 6 bit rate (now it has only 13, 14 and 16 bits), and audio is coded at SBM, quality is 12 bit dynamic range which is better than available at MP3. And it is listenable without SBM codec at 6 bit quality. AMR codec data rates drop signifigantly (from 16 to 6 bits) and more information per bandwith could be sent. It is even possible go down to "1 bit PCM" (actually it is ADPCM because only 1 bit is used, in opencores.org is 1 bit ADPCM project, and perhaps using bitsnbites.eu -netpages DDPCM Dynamic Differential PCM principles, or using Recursevely Indexed Quantizer RIQ-ADPCM, or other effective method ). Only 1 bit per herz if dithering is used in audible volume, 8 bit is maximum dither improvement in audio quality and together with SBM it is about 10 bits or 60 decibels for dynamic range and noise distortion range, still near MP3 maximum quality. Using only 1 bit ADPCM for each frequency herz. But now only decoder with SBM will make audio listenable. SBM patents have already expired. Perhaps even lower frequencies (1,2 Khz to 7 Khz maximum) is possible, high frequency replication is needed everything over 1,2 - 7 khz, and perhaps high pass filter for quantization noise even in 1,2 - 7 khz frequencies. And using high frequency replication: Some methods start at 4 khz, so only 8 khz sampling rate / highest frequency 4 khz is needed, over that everyhing is reconstructed with high frequency replication. Because of quantization noise, only 3,5 - 3,7 khz is usable, not 4 khz.Sound quality is lower in 4khz than 7- 8 khz frequency limit, but acceptable because minimal data rates are needed in toll free internet. Synths make electronic sounds so perhaps only 3,6 - 4Khz khz is needed for their sound generating (synth engines) and everything over 4 khz is reconstructed using high frequency replication in the final mix (2 - 6 channels). Even 2Khz is possible in some high frequently replication schemes, it makes 4 khz of the highest frequency replicated, that is enough for most musical notes, so cheap synth on a chip solutions could be more simple. Also bitrate could be dropped from 16 bit to 6 bit in the synth circuit, the final DSP that makes the 2 -6 channel final mix increases bitdepth like some high tech audio DSPs do, from 6 to 15 bits or from 6 to 24 bits, the increased dynamic range of these upsamplings is perhaps 12 bits in the final audio from 6 bits. Also using aural exciter or harmonizer in the final mix, those circuits are relatively simple and can add even more frequency on the top of the already replicated (doubled) frequency range of high frequency replication. Synths using only aural exciter circuits are Spatial Aural Exciter by Andy Kramer and EXCTER by Jari Suominen. And using EML Polybox (or RSF Blackbox or Ethenvar Patch Chord) to increase paraphonic polyphony in the sound so only 4- 32 voices are needed and and result is several hundread paraphonic synth voices. Not strictly coping them but using same principle for paraphonic voices. And for cheap and effective synthesis "direct digital synthesis" by Orino (writer). And using divide down oscillator circuit like old paraphonic keyboards (Polymoog) in single chip systems will improve sound of primitive synth on single chip solutions. They all can be grouped together ( high frequency replication, aural exciter, and Polybox type paraphony together with divide down oscillator type keyboard paraphonic voice, and finally from 6-8 bits voice to 15/16 - 24/32 bit voice DSP bit depth enchantment with increased header bits, sound quality is about 10 -12 bit dynamic range if 6 bit is used in the beginning. If synth chip uses ADPCM like some or most single chip synths can do, then using 1 bit ADPCM for sound generation and then perhaps in the DAC stage adding digital dither to 1 bit ADPCM and expanding precision to 4 - 8 bit ADPCM using "header" that is 3- 7 bits long) all these techniques only in the final 2-channel mix (or mono or 5-6 channel surround sound) . So actual synth voice can operate low bitdepth and low sample rate. These techniques can be used in speech voice compression and music compression via mobile phones also. Polyglot speech synthesis can be utilised in the speech synthesizer if the phone have one. So synth in the phone can now generate more voices or effects. For telephones methods such as ADPCM and logarithmic (4 bits logarithmic equals to 7 bits linear) are more efficient than ordinary PCM, but AMR codec operates only in PCM and only in high bitrates. RIQ-ADPCM or methods like ITU G.711 standard that uses logarithmic u- and a- law algorithms (compressing 14 bits to 8 bits, if 4 bits logarithmic is used that is not in the standard, 7 bits precision is possible) and then using G.727 type compression the final bitstream is, 3bits or 2 or 1 bits bits (if in the beginning is used 4 bit logarithmic not 8) using "dropping insignificant bit" scheme. Adding dither and other sophisticated noise shaping sound quality should be good but data rate very low. And all this using old simple telephone standard techiniques. For simple low bitrate voice / music codec for toll free internet and simple devices made with printed electronics etc. Most comprehensive compression is in the MPEG4 standard, it has inbuilt softsynths / soundfont synths/ hardware synths for sound and music, and uses TwinVQ compression which is best available slow bitrate audio compression. But it is complex, requires license and is used very little nowadays. However TwinVQ is best low bitrate comperession for audio, and is dated from about 1995 so it is license free technique, altough different codecs that use it are not yet license free (they are from 1997 - 1999 about). Some really cheap music synths are being sold to Apple (iOS) phones, however they require iPhone or iPad to work, that costs hundreads of dollars. Building hardware (keyboard and cheap ARM processor with memory chips) console to iOS apps like Peter Vogel Fairlight or Wolfgang Palm and Waldorf iOS apps, these cosoles can be made very cheaply and outward look of old Fairlight or PPG Wave, but price is only few dozen dollars when manufactured in china. Problem is that iOS is Apple product. If however all graphical user interface and software connections out are eliminated, so that only bare hardware (the music synth itself) is functional perhaps the problem with the license of Apples OS can be solved, and because these synths operate only synth itself and not operate any other software form, interface is only though hardware console and not throuh software, cheap hardware synth using cheap iOS app is perhaps possible without license payments for OS. Softsynths are cheap so making hardware consoles that mimic for example Moog System 15 outward look that cost 10 000 dollars, but in fact use Moog iOS app (30 dollar price) virtual analogue or Arturia Modular V instead, these cheap hardware consoles could be made for other soft synths also, like Native Instruments Reaktor etc. These minimal price hardware (virtual) modular synths and other would have market place in third world. DiscoDSP imitates Clavia Nord Lead and costs 150 dillars, real Nord Lead 2200 dollars. If cheap keyboard with DiscoDSP inside is made “poor man`s Nord Lead” is reality etc. The Plugiator tabletop synth was partly product from India, and in Pakistan there is “Pakistan syntheziser company” soft synth firm, so music electronic industry in third world countries exists. If Windows Phone 10 can operate Windows PC programs, and Windows Phone 10 OS is now free, very large tablet PC with large display can then run Windows PC softsynth programs theoretically using Windows Phone as OS that is free from payment. Earlier phones used synth sound chips from Vimicro, Rohm, Oki, Crystal Semiconductor CS9236, Atmel SAM or Macronix synth sound chip for phones, and Micronas 3151G, nowadays only Yamaha and Dream chips remain in production. If super cheap phone includes one of these discontinued wavetable chips that are cheaply made and old already, synth engine inside every cheap phone ispossible, and if several chips (for example Yamaha and Dream together) inside cheap tablet PC or laptop, cheap music making PC that not necessirely even needs soft synths when they have hardware synths included, is possible to build cheaply. And for hardware music synths: if it is possible to built cheap hadware controllers for soft synths then it is possible to build software controller hardware synths for analogue circuit mainly. Hardware analogue synths need much knobs and switches but if software program like Mota Volta or Expert Sleepers Silent Way handles all expect putting wire in the right place (modular analog synth that still has wire connections between modules but knobs and switches has been eliminated and operated by software on the display and keyboard controller).
Because neuromorphic chips like NeuroGrid are coming, and people wonder what to do with it, because computing with them is very complicated and totally different from von Neuman computing, one use for neuromorphic chips is perhaps muisc synth. there are examples such as Jomox Neuronium Resonator, Hartman Neuron and Dewanatron Neuronics (not even published yet). Using NeuroGrid as music synth, it is analogue circuit (or 11 circuits) manufacxtured old fashioned 180 nanometer technique, but it is analog and not digital. Due to its old fashioned fabrication, mass production of NeuroGrid would cost about 400 dollar per circuit board. And computing power is 9000 times higher than avarage PC and power consunption 2 watts. But programming enviroment is totally different than nowadys. Using neuroGrid as Hartman Neuron type music synth is one possible commercial solution for neuromorphic new chips. And about using fuzzy logic etc.: “High frequency range in low-bitrate audio coding using predictive pattern analysis”, “Video data compression using artificial neural network network” 1991, “A micropower learning vector quantization for parallel analog-to-digital data compression” A. Lubkin. This one is almost impossible to found in the internet: “Sample by sample adaptive differential vector quantization” (SADVQ, but this SADVQ is not the “serial adaptive differential vector quantization”). And how to use printed electronics: it is possible to use simple CMOS 4000 series (like 4060, one 4060 is enough for primitive “music synth”, or 4106, or XR2206 circuit). Manufacturing them using printed electronics is not difficult task, and then coupling them many in one circuit board for multivoice synth that cost almost nothing (can be given away for free in development countries if commercial sponsor is found, for example printing advertisements on the surface of the keyboards, advertisement money pays the musical instrument and it is free for end user). Also because analog electronics can be build using printed electronics (roll printing mass production) too, why not building some simple like Minimoog on printed electronics, or one chip integrated circuit version of Minimoog (like Anadigm FPAA). or Jen 1000X, or Unisono-83 (rare checkoslovakian synth that has simple circuits) in printed electronics form that cost almost nothing, or from the netpage karmetik.com (artist community using electronics) Jim Murphy
s Gemini modular synth that uses minimized amount of circuits, or Castle Roctronics modular CMOS synth. All these in simple printed electronics, roll printing, cost is almost nothing. For compressing any audio sound, such as music codecs like MP3: efficient methods for roll printed circuits and other are direct digital synthesis by Orino 2005, patents by Ossi Kalevo using "ODelta" encocoding and modulation method, and pyramid vector quantization, cubic vector quantization, spherical vector quantization etc. used with or without ADPCM, or RIQ-ADPCM (Recursively indexed quantizer). And multipre description coding,and multiple description delta-sigma modulation / coding. For low bitrate audio there is "Session P26 low bit-rate audio coding" conference papers (aes.org/events ,2008), "A complex envelope sinusoidal model for audio coding" (Bartkowiak), " A simple adaptive matrixing scheme for efficient coding of stereo sound" Bartkowiak, "Low complexity parametric stereo coding" Schuyjers 2004. if very low bitrate ADPCM or delta-sigma modulation is used (only 1 bit for each herz, no oversampling ratio over 1 even in delta-sigma), then perhaps both low pass and high pass filters must be used on audio stream to bring down quantization noise. Limiting frequency to 2 / 4 khz and using most efficient High Freqiency Replication, together with aural exciter on high frequencies that are top of the 4 - 8 khz range available in HFR. Floating point numbers cant go below 12 -13 bits before they lose precision. 8 bits is available using logarithmic u-law and a-law scale, precision 13 - 14 bits. But minimal logarithmic scale that has some accuracy is 4bits log, that has precision of 7 bits or values between 1-100 in decimal system about. How can this accuracy is possible to maintain in 1 bit system? Perhaps using delta modulation together with this 4 bit logarithmic, delta modulation brings bitrate down to 1 bit (1/4 from original) without significal precision loss. There are old papers like “Adaptive rate delta modulation for non-synhronous, full duplex, digital communications” B. A. Harvey, " A new adaptive delta modulation system" H. J. Kim 1975 about, “Constant factor delta modulation - a new instantenously adpative delta modulation system” Kyaw Aret 1973 (C.F.D.M) , “Adaptive delta modulation for improved voice quality” 19.3.2008 CML Microcircuits at dataweek.co.nz netpage, " A 2-bit adaptive delta modulation system with improved performance", National Semiconductor and their “Digitalker” delta modulation for phones, " A control-theoretic approach for efficient design of filters in DAC and digital amplifiers" Tsakalis 2010,“A modulater hybrid filter bank for wide-band analog-to-digital converters” 2014 Chunyan. Delta-sigma modulation can also in parallel processing version (“Single bit pseudo parallel processing low oversampling” Hatami) and its improved version (Johansson, Svensson 2014 " A novel speculative…") can be effective, but complicated. There are efficient noise shaping methods for delta-sigma modulation that have 50 decibel (8bit) surface to noise and dynamic range and 70 decibels range (12 bits) if dithering noise becames audible. So not even oversampling ratio over 1 is needed in delta sigma modulation to decent quality audio codec, using only 1 bits. And if distributed parallel model is used perhaps bitrates as low as 1/16 bits per hertz (or 1 bit for 16 herz) or 1 bit for 32 herz (if parallel distributed delta-sigma process is 32 to 1 ratio) in delta-sigma modulation. And that could even compressed even further perhaps using quadrature mirror filters and other methods that Sony ATRAC and SACD is using. ATRAC promises at 48 kilobits/ second “CD quality sound” using 16 bits PCM. If one bit delta-sigma is used and oversampling ratio of 1 compression is near to 3 kilobits/sec and distributed model (Hatami and others) perhaps only 0,1 kilobits / sec for CD quality sound. If 48 khz sampled / that has 24 khz audio range is using 60% (14,4 khz) for actual audio and 40% (9,6 khz, rest of available 24 khz audio spectrum) for quantization noise that is “almost oversampling ratio 2” audio codec for delta-sigma modulation. If frequency is only 0- 2000Hz, higher range is artificially manufactured using high frequency reconstruction, SBR that MPEG uses creates high frequencies sliding between 4 khz and 10 khz base, creating 16 khz sound. Lowest possible replication range in some models is 2khz, creating 4 khz sound. But that is sliding like SBR and only minimum, perhaps even 7khz tones is possible in only 2khz base sometimes. So using 2khz base (4,4 - 4,8 khz sampling rate, over 4/2khz is for quantization noise) 4 - 7 khz is achiveable, over that 4 - 7 khz frequency using aural exciter even more high frequency sound can be generated, altough they are just hazy harmonics. If now this 2 khz sound is using 1 bit ADPCM, 4 bit logarithmic scrutinized for 1 bit, or delta-sigma modulation, only 1 bit for herz is needed. That sound can be compressed even further using parametric stereo (2 channels to 1) and then all those compression methods that modern audio compression uses (quadrature mirror filters, MDCT, vector quantization, perceptual coding, adaptive bitrate, adaptive quantization step etc) and scrutinize that audio about 10 times smaller still (or even 15 - 30 times smaller, like most effiicent audio codecs can do with raw data stream). Result is 0,5 kilobits mono/parametric stereo and 1 kilobits stereo audio stream. perhaps 64 bits /sec is reserved in parametric stereo model for 2 channel coding “side information” and 128 bits in stereo stream for high frequency “side information” so no “blind source encoding” is needed. That 64 / 128 bits is propably packed like other audio so actual information density is 640 or 1280 bits /sec for side information. When that 1 bit audio enters in the DAC it is enchanted using additional header (ADPCM can be increased from 1 bit to 4 or 8 bit ADPCM, (1 bit actual audio,rest is header), and 1 bit log delta transferred first to 4 bit log, then 7 bit linear PCM (with dither etc. that coding uses) and finally to about 21 - 24 bit linear PCM (with everything over 7 bits is header) for improving audio quality. This is minimal data rate audio codec. In ADPCM and 4bit log 1bit delta using dither, Super Bit Mapping, extensive noise shaping etc. is used for improving sound quality, using dither in a way that it becomes audible if large dynamic range is needed. Delta-sigma already have very sophisticated and efficient noise shaping methods and low oversampling ratio versions, and parallel distributed versions for low data rate, that have theoretical background, but no real real world implementation because old Super Audio CD standard does not use them. There can be this “minimal data rate audio codec”. So first 13 bit PCM is transferred to 7 bit PCM using Super Bit Mapping or similar technology, saving 6 bits, then 7 bit PCM is transferred to 4 bit logarithmic (same accuracy), then 4 bit logarithmic to 1 bit delta (or Takis Zourntos
s "nonlinear control" model, but without oversampling) or DPCM, or other method 4 bits to one, accuracy is still almost 4 bit but data rate now only 1 bit for herz. And final accuracy is almost 13 bit, using all these methods for scrutinizing 13 bits to only 1 bit. Almost 13 bit accuracy in one bit can be improved still using additional header at DSP, 13 bit PCM + 19 bit header (1,5 times original data) = 32 bit, accuracy is now about 16 bit CD quality. All this using only 1 bit/herz. For total cost free internet, paid by advertisements and commercial sponsors, in development countries. It needs "minimal data rate video codec" too, with minimal acceptable quality (small pixel count, colour quantization logarithmic, minimal colour values per pixel, small frame rate, minimum number of keyframes, maximum compression for everything, new compression techniques for video coding has been invented lately for super-efficient coding of video). For free internet. TouchKeys by Andrew Macpherson is a method for music keyboards that is simple refit to keyboards without touch sensitivety to add it and plyphonic aftertouch. For hardware music synth using only 1 bit ADPCM and then heavy dither that is audible, 8 bits is reached improvement in accuracy, 1 bit ADPCM is acceptable sound quality now and listener propably does not even notice dither noise because electronic sounds have such humming quality anyway. Delta-sigma modulation without oversampling ratio bigger than 1 is achivied in nowadays noise shaping methods, 50 decibels signal to noise ratio and 70 decibel dynamic range but dither becames over 50 decibel audible. Mp3 maximum dynamic range is 64 decibels so this delta-sigma without oversampling is feasible. Or use Takis Zourntoss nonlinear control model.
There are even methods for go below Nyquist sampling rate, and it is possible to reconstruct the signal with just a fraction of bandwith. On paper " Sub-Nyquist sampling: bridging theory and practice" 2011 Mishali, is methods like folding Nyquist window etc. Successive Approximation DACs (SAR DACs) have promising capabilities for ultra low sampling rate. On paper “new approach based on compressive sampling for sample rate enhancememt in DASs for low-cost sensing nodes” 2014 Bonavolonta is information that only 2% of required sampling rate is needed to reconstruct the the whole frequency band, so only 200 samples from 10 000 samples is needed to reconstruct all 10 000 samples. Efficiency is enormous 50 to 1 ratio. 50 to 1 ratio below Nyquist rate is so enormously small sampling rate that even if quality of end product (audio or video) is bad, but if it is at least minimally audible or visible, it must be used in ultra low bit rate audio and video coding. And that is only for sampling rate, other compression methods can be used for on top of that and make data rate smaller still. If that sub-Nyquist sampling is possible (never mind the quality) it must be used on minimal data rate audio / video codec. Others on on the same matter: “Non-uniform sampling algorithm and architechtures” Luo 2012, “Jittered random sampling with successive approximation ADC” Luo 2014, “A bit-constrained SAR ADC for compressive acquisition of frequency sparse signals” Waters, “Calibration of sampling clock skew in high-speed, high resolution time interleaved ADCs” Kumar, “Compressive sampling with successive approximation ADC architechture” Luo, “Parallel-sampling ADC architechture for power-efficient multi-carrier system” Lind 2011, “An energy-efficient noise-shaping SAR ADC in 28Nm” 2015, “Compressive sense based reconstruction algorithm non-uniform sampling based data converter” US pat. 8547260 2013 Sestok, “A jittered-sampling correction analog-to-digital converter” Parsons 2014, “A compression sampling system based on sparse AR model” 2014 Ye, “Compressive sense based reconstruction algorithm for non-uniform sampling based data converter” patent 20130069807. If video signal is coded, using perhaps only 1 bit for grayscale per pixel with efficient dither (dither turns black and white pixels into grayscale), for colour minimal colour values, dithered logarithmic colour, many pixels share same YUV colour etc. Splitting video picture to very small subframes and coding them separately using those random sampling/ jittered sampling sub-Nyquist techniques. In netpage endlesscompression.com is examples of effective compression methods. For stereo sound is “Coding of stereo signals by a single digital delta sigma modulator” 2014 Callegari. For sound also coding 4 bit logarithmic (smallest logarithmic with significant precision, 7 bit) with delta coding, or DPCM, or ITU G.727 style “drop insignificant bit” scheme that turns 4 bit to 1 bit (using 4 to -3 - to 2 -to 1 bit bit dropping scheme), in order to maintain good precision of 4 bit logarithmic but having it in 1 bit form almost with same accuracy. Video game insdustry used for sound Xan DPCM, id RoC DPCM (RoC Multimedia) and Duck DK DPCM. For delta-sigma modulation: “A higher-order mismatch-shaping method for multi-bit sigma-delta modulators” Alexander Lavzin, “A thermometer-like mismatch shaping technique with minimumelement transition activity for multibit delta-sigma DACs” Sanyal 2014, “A new DAC mismatch shaping technique for sigma-delta modulators” Aboudina. If quantization noise is high in low sampling rates, perhaps using “multiband dynamic range compression” and “Linkway - Riley crossover filters” if they bring any help. For very low sampling rates 4,8 khz that have 2 khz for audible range and 1/6 or 0,4 khz for quantization noise if Nyquist rate is used, 1/10 of normal 48 khz sampling rate. Also 4416hz that is approximation of 44,1 khz rate 1/10, if that is divided by two and 1/8 is reserved for quantization noise, only 1932 hz is left. Human hearing cannot hear frequencies below 50 hz so perhaps 48hz - 1980hz is available, rest is reconstructured using high freqiúency replication, 4-7 khz range, and over it aural exciter brings even more high frequencies. Similarly 4,8 khz ( 2 khz) can be used using 48 - 2048 hz range. There is also “quadrature delta-sigma modulation” but its suitability for audio coding I dont know. Exotic coding/ modulation methods are “spherical fibonacci mapping”, “spherical hashing” (J. Heo), “Internal noise shaping with pulse width modulation” (Midya), “Quantization noise coupled delta-sigma ADC with delay”, “Time quantized frequency modulation with… codes” (Malcom Hawkesfrod), “Analytical… of VCO-ADC quantizer using pulse frequency modulation” Hernandez 2012, “Lossless compression for u-law and ADPCM on the basis of a fast algorithm” Ang, “ADPCM with adaptive post filtering delay tree audio coding”, “Low delay vector-quantization subband ADPCM coding” Fink 2015. On paper “32Mw 320Mhz continous-time-complex delta-sigma ADC for multimode delta-sigma wireless LAN” is something like Quadrature Amplitude Modulation coupled with delta sigma modulation. If information packing /compression capacity of QAM can be coupled with delta or delta-sigma, delta modulation efficiency can be in very high information packing level. On patent “Method and device for encoding and decoding data in unique number values” patent by Ipo Paul Willem van der Boom is old method from 1972 that compress text in number values, for text compression. Also besides video and audio compression cost free internet needs text compression, and ScreenPressor type web page graphics compression, if web browser itself does not support web graphics.compression. There is also something like “pyramid logarithmic quantization” altough it is not called by that name, different versions are “Perceptual vector quantization” in daala video codec (that one looks like quadrature amplitude modulaion at modern version, if that just could be coupled with delta coding etc. logarithmic like delta-sigma), “Piecewise-linear radial compression function for pyramid two-dimensional quantizer” 2014 Jovanovic, “Multirecognition vector quantization for video coding” Calvagno 1997, “A robust image watermarking based on gradient vector quantization and denoising using counterlet transform” Kullayamma 2014, including “logarithmic quantization index modulation LQIM”. “Harmonic vector quantization” Ericsson research, “Modelling geometric-temporal context with directional pyramid co-occurrene for recognition” Yukal, "The pyramid hierarchically contour processing " Meer 1990. There is also “Oversampling audio without delta sigma modulation based on nonlinear control” by Takis Zourntos, it is much more stable than delta-sigma modulation and therefore more effective. There are also texts by Elettra Venosa, mainly about “Time-interleaved ADCs” and other low data rate converters. There is “Simplified floating-point division and square root” by Viitanen 2011, for DSP processing.
Minimal operating system like Symbian has an advantage that because it is old, it has programs and apps that have very little memory requirement. Symbian has some 101 000 - 102 000 apps, and erliest are before year 2000 when Symbian was called EPOC. Those old small programs can be stored huge amount in one memory chip inside phone, those old programs are few dozen or few hundread kilobytes each. Games etc. and different computer programs. Because they are so small, and Symbian has lost its position as commercially succesfull product, those apps have small or nonexistent value. 10 or 100 or 1000 or 10 000 of those Symbian apps could in one memory chip for free and that memory chip is inside one cheap feature phone. The cheap phone comes preloaded with about 10 000 free apps inside. For free internet cheap phone with minimal operating system that works on low power and memory and transistor count and processor can be manufactured using printed electronics, and preloaded with some 1000 - 10 000 small memory requirement apps so phones owner does not have to scan internet to obtain them, would be perfect solution for cheap free / minimal price phone for cost free internet. Netpages like tinyapps.org that contain minimal computer programs are examples of development that is good for cost free internet. Programs are few kilobytes or few hundread kilobytes max. If processor is not manufactured using printed electronics, battery, display, keyboard etc. could be made cheaply using roll printing and “modular phone” concept that user can itself replace components on phone without discarding the whole phone could be useful, but not perhaps in the cheapest few dollar production costs basic models. Symbian fulfills those requirements for simplicity and low memory requirement apps, that Symbian has huge back catalogue with, and that huge catalogue or part of it, free apps, can be inside every Symbian phone that is offered for cost free internet. Simplest solution for ultra cheap phone is that phone has not specific operating system at all. Perhaps simple RTOS for most simple procedures but no any complicated OS. Perhaps still without operating system cheap and simple electronic games like simple electronic hand held game consoles of the 1980
s can be included on the phone, like old "worm" game of old Nokia phones etc, and simple applications and programs (mainly text-based) for the phone and for the phones user, but nothing very sophisticated is perhaps not needed anyway for ultra-cheap phones made with printed electronics etc. Ogg Opus is unified speech and audio (music) codec and it is license payment free, so AMR speech codecs and MP3 etc. music codecs can be eliminated (altough MP3, AAC, and Microsoft audio codecs are license payment free already for phones, but speech codec AMR is not). Ogg Opus already uses “high frequency huey coding”, equivalent to AAC Sub Band Replication, but other methods like “High Frequency Residue Replication” Ma 2009, are being studied. If quadrature filter banks like in AAC or TwinVQ quantization is used in Opus perhaps compression ratio becomes even better. For video compression there are license free alternatives like libde265, Google
s video compression and Daala (not ready yet), and some efficient but exotic like ScreamingHD. For coding stereo content into mono signal there are methods like "Directional Audio Coding" DirAC, and "Spatial Impulse Response Rendering" SIRR, both from Aalto Acoustics Labs ( by Ville Pulkki), these methods code in one loudspeaker stereo spatial sound using psychoacoustics, but how they work on headphone listening I dont know. And even more complicated methods like Karhunen-Loeve transform modified to multi channel sound coding exists, either 2 channels from 1 channel, or 6 channels from 2 channels coding. And in MPEG 4 standard there is Binary Format for Scene description BISF and its Advanced Audio (AABIFS) version, and MPEG 7 AABIFS also, that has virtual sound enviroment capabilities.
Previously I suggested that some 3G or 4G network phone
s data rate (2Mb to 100Mb/sec) could be split into smaller parts and using that same data rate that is now used for one one phone could be split between many users, if data rate is only 20 kilobits/sec this "virtual 2G" network can be installed for example 1000 users instead of only one user using 2Mb data rate. Because teleoperator costs drop now only 1/1000 of previous, and simultaneysly advertisers reach 1000 times more customers (1000 customers can be now reached at the same cost than one customer using 2Mbs/sec data rate, advertiser gets 1000 times more money per customer), total cost free internet for end user can now be true. If 4G/LTE network is used data rates are 20 - 100Mb/sec and splitting that in 20kilobits/second sections brings 100 - 20 000 "data users" in the place of only one customer. However it seems to me that splitting data between customers is not possible in nowadays technology. But there is solution for this: multiuser "phone cell", or multiuser content system. The radio "cell" that one customer uses in 3G or 4G cell phone network is now shared between 100 - 20 000 customers in multiuser content system. Now every message received in this radio "cell" targeted for only one phone is received to thousands of telephone / tablet PC owners. In order to keep messages private data encryption is needed: For example every receiving message has "adress code" similar to individual phone number, altough thousands of phones inside radio frequency cell receive that same message, phone hardware checks the address code in the beginning of the message, and if the address code is not the same as in the telephone, telephone does not react to that message and does not process or open the message. Information can also be encrypted, text (SMS messages and email), and voice can use "scrambler" that military radio phones use to hide its information. So altough thousands of phones receive the same message or information, only if address code is right the phone opens the information, and if encryption is used not even opening the message bring information usable to someone who is not in the same address code. The encryption key must be of course individual to every user. If encryption on the hardware cannot be used or radio communication already uses it in the 4G network, then using double cryptography that uses one code to open the message, but the opened information is encrypted using another coding method, that another code is decrypted in the software in each individual phone. I don t know how video or visual information can be encrypted. There are things like Mikogo desktop that is shared desktop / operating system. In Wikipedia is "comparison of remote desktop software". But this multiuser system is not exatly like shared remote desktop, altough it can be used like it. It can be even better than conventional internet because now one receiving message can be received between thousands of customers if needed instead of one , in the cost of one message, messages like commercial advertisements, or shared messages etc. Negative aspect is slow data rate for one customer, but using sophisticated data compression methods like Finite State Encoding (FSE), or QDigest or other it is possible to overcome this and different audio- video etc. compressions etc. Instead of 3G or 4G LTE, Wifi phones can be used. Wifi phones can be even cheaper to built than LTE phones and data rates are at 4G 100 Mb/sec to 350Mb /sec. That means 5000- 20 000 "virtual 2G" data rate channels, or 5000- 20 000 customers in inside one Wifi cell. Cheapest chinese Wifi phones start at 5 dollars for large factory order, and cheapest GSM phones about 4 dollars, altough both these cheap Wifi and GSM phones are quite primitive. Using Internet of Things protocols (some of them have megabit sec data rates, at least in"burst mode") can be used to bring costs down for both receiving device and teleoperator. On the uplink if messages that are send "crash" because there are thousands of customers in same radio cell, simply "send again" procedure and message on the phone screen resolves this problem. If user wants to share his information, song he is using or video he is downloading, customer can simply left it be not encrypted and without address code, now everybody in the same radio cell can watch the same video or hear the same song. In free internet for development countries only public domain material or other license / royalty payment free material is used, so sharing information (like song or video) is cost free in free internet for developing countries. Public domain means different things in different countries. In USA early Alfred Hithcock are publibc domain but not outside USA. In England old Michael Powell films are public domain but not outside England. In Japan old Akira Kurosawa films are public domain but not outside Japan. If now could be agreeded that if some information is in public domain in its home country (or in the USA, USA is the most used source of public domain material) that same material can be public domain if not all over the world, at least in poor development countries. Altough material is license payment free, the free internet is still funded using commercials, there will be commercial breaks like between Youtube videos, but not opportunity to skip adverts, and in audio stream adverts too. Using graphical user interface in free internet net is full of pop up window comercials. The more money from advertisers free net collects the better, enven licence payment material can then be used on free intrenet of developing countries. If Wifi and IoT is used devices can be very cheap, or even usual phone components. Maximising roll printed electronics like displays, keyboards and batteries and making rest of integrated circuits so cheap as possible in some chinese OEM factory. Printed electronics solar panel on the phone itself can be used as battery charger, or left battery out and use solar panel as only means of electric power, when sun does not shine phone does not work. Or other similar methods like using body heat as energy source etc. Some IoT low power device can work on these methods. These super cheap phones could be advertisement paid, because production costs are 1-3 dollars per phone and then distributed free, without cost to end user in free net. Even "expensive" "smart phones" and tablet PC:s that cost 10 -15 dollars to make in mass production factory price, can be adevertisement paid with commercial sponsors, phone is painted full of advertisement logos, in the hardware level there is adware etc, user must hear/ see commercials from the manufacturer all the years he uses the phone etc. If there is no way to encrypt information individually in one phone radio frequency cell, or use address code that prevent to open messages if address code is not right, then only way to use this multiuser system is that privacy must left out, every message is heard to everybody inside radio frequency cell and that is the price of cost free internet. Like using skywave radio comunication, at low 20 watts every message can be heard all over the world to everybody, that is real "multiuser system" and worldwide without teleoperator costs, because athmospheric propagation transports the message. There are several athmospheric propagation methods different wavelengths from below 1Mhz to several gigahertz, and some are being examined as means of long range Wifi (hundreads of kilometers Wifi range radio communication). These things (multiuser internet for development countries, slow data rate, many customers using same radio frequency cell simultaneysly, either for receiving data or sending) is possible today. Costs will be 1/1000 - 1/ 20 000 compared to nowadays teleoperator costs for one customer. State owned telephone firms are possible the most suitable users. Over third world almost in every country there is teleoperator that is state owned, or partially state owned, by some rich industrial country, some middle eastern super rich country, or China, or development country itself. Teleoperator business is together with weapons trade and oil business one of the most state owned businesses in the world. And this shared multiuser system will perhaps bring huge profits to teleoperators and expand their customer base exponentually to billions and billions more customers. And it will be cost free for end user. Propably private firms like Millicom that operate only in development countries can use this method too. In development countries, even in poorest ones, have today 4G networks, either Wifi or LTE, and state owned teleoperators are using them. Cheap Wifi device is easy to build, even cheaper using roll printed electronics on those parts that are possible to manufacture using it. The multiuser "virtual 2G" concept inside one 3G or 4G radio cell is capable to bring down costs to minimum and expand advertisement money to maximum. For free internet for developing countries. If 20 kilobits/sec is too slow data rate then higher rate is possible. Obviously all 1000- 10 000 users inside one cell are not simultaneysly using net so data rate in most cases can be higher. This "radio cell" is not like traditional cell phone radio cell that telephone networks uses, normally one radio cell holds thousand individual phones.this "virtual 2G" is just one telephone connection in this normal radio cell of thousands of individual phones that have 100 - 350 Mbtis/ sec data rate for one user in 4G network, But in multiuser content system this one connection of 100 Mbits/sec data rate is shared by thousands users. If 4G wifi connection has 350 Mbits/sec data rate, it is shared between 20 000 users. It is like all 20 000 have the same telephone number, because they all are using same telephone connection that is normally used by only one people (altough they dont have the same telephone number, but principle is that one teleophone connection is used by thousands of people). It is like 20 000 people using the one and only telephone at the same time, (although there are 20 000 phones, using only one telephone connection). They can
t all have same telephone number because when people move and use mobile phone they change radio cell and link tower when they move. Despite the fact that people have different telephone number if there are 20 000 people in some geographical area that fits inside one "radio frequency cell" that is normally used for only one telephone Wifi user, all received messages (downlink) will now be received together with 20 000 different cellphones, and all sended radio frequency messages (uplink) of 20 000 phones will go to one telephone connection "slot" of the link tower. The principle is same as net browser that uses only one net connection but the browser has browser subdomains, or many sub- browsers inside one main browser and now many different users can use only one net connection through these sub- browsers inside one main browser- principle (in this case "main browser" is shared between thousands of phones, there are distributed browser, or distributed operating system concepts etc., many different ones, but the phones used in this shared network can still be Symbian or Android etc. if wanted, and shared network is just simple communication protocol inside Symbian or Android phone, or go step further to complicated distributed operating system concepts, byt because simplicity is needed in free net these high-tech concepts are propably not needeed like distributed operating systems. Dooble browser itself is in its original distributed form and now a "desktop" or sort of simple operating system). Multiuser browsers with one net connection are iSpaces, iCube (previously called iRock or Rocknelt browser) etc. This is the same situation like multiuser browser inside one phone using one net connection, but not used for internet browsing only but all audio and video communication also, and those 20 000 cellphones have the same multiuser browser for one telephone connection to link tower that has 20 000 subdomains. In normal multiuser situation all messages received will automatically go to 20 000 cellphones. For privacy all messages and received information downlink have individual "address code" in the beginning of every received or send message, (text, audio or video) and now phone sees should it react to message, and open the message (right address code) or not to open the message (address code different than in on the phone), and perhaps individual encryption or double encryption for privacy. For tablet PC or laptop this same method can be used, and in the net browser browser "subdomains" that share one browser to several users, like iSpaces Cloud browser/computer. Maximum data rate is 17 kilobits/sec in this 20 000 users inside one 350Mbits /sec phone connection model. For uplink and send messages to prevent data crashes maybe "waiting on the line" model where one has to wait in the line perhaps several seconds or minutes to have free data slot to messages uplink, after pressing "send" button it takes time until phone announces "message send". Realtime data transfer like telephone conversation is difficult using this method uplink, but perhaps possible using slow dta rate and frequent "data crashes"on the line if many people are using realtime data transmission at the same time. Normally in cell phone radio frequency is shared into cells that use "time division multiplexing" and other tricks, one cell has perhaps thousands users and data rates of one user is from 2Mb (3G) to 350 Mb (4G Wifi). But now this one user slot must be divided between thousands of users, and then thousands of these slots (that normally combine only one user with hundreads of megabits data rate) combine one normal "radio frequency cell". Multiuser content model where information downlink must go to everybody in the same one user radio cell area is only possible solution. If information is individually encrypted or have some sort of identity code, altough thousands of phones receive message only one opens it. when user shifts position and enter another cell phone tower link he is in the area of another radio frequency cell and shifts now to use it and there is another 20 000 people in the same user slot that he is using. This is like normal cell phone operation but insead of one user for one telephone connection there is now 20 000 users for one Wifi telephone connection in shared multiuser model, using same frequency, same time slots etc, same time division multiplexing, same everything, sharing one telephone connection. For voice communication perhaps sharing one speech voice channel between dozens of users brings data rate savings. The cacophony of dozens of voices speaking same time would be enormous, but using "voice scrambler" code that military radio phones are using, individually coded voices can perhaps be separated from cacophony, and using "polyglot synthesis" or other to make information audible, at least speech voices of telephone conversations and internet radio speech voices. And using CELT type speech synthesis. Now several speech voice channels can now be transmissed using only one channel for voice. All this shared multiuser content system thing, one radio frequency connection normally aimed for one user shared between many people, "virtual 2G" system, can be used in 3G, 4G, 4G LTE or in Wifi networks. For voice communication, because "wait on the line" model is used, perhaps radio telephone (trunked phone network) type communication (push to talk over cellular) that is already possible in some phones, after one say something on the phone he/she presses "send" button on the screen, then voice is send using data compression, "beep" sound gives signal when data packed voice is send, if signal is not heard that is because data crashes on the upling have prevented message, pressing "send again" button and perhaps now message goes through. This kind of push to talk over cellular limits voice channels to one (instead of two) and makes voice communication possible even in "wait on the line"procedure. Radio protocols like TETRA, its british equivalent, Tetrapol or Project 25 operate at low frequency range (about 100 Mhz lowest) and does not neek link towers, because contact is direct between phones. Motorola IDEN and WiDEN and european OMA PoC are similar but inside mobile phones, and does not neet link tower either. Low frequency gives more range to phones and slower data rates, but one link tower can now cover much large geographical area. Thats why CDMA phones are recommended for development countries because their lower frequency than GSM gives them greater range and therefore less infrastructure (cell phone link towers) are needed. CDMA phones are more expensive by avarage than GSM phones, but only because they are manufactered in smaller quantities, when mass production reaches same level as GSM phones there is no difference in prices of GSM or CDMA. CDMA requires however less infrastructure costs because of greater range. If GSM frequencies go down to same leveI as CDMA, GSM can cover the same area as CDMA also. If frequencies go down to 100 Mhz which is close to TETRA etc. networks, range is even more greater and perhaps athmospheric propagation methods becomes one way of communication to over long distances, athmospheric propagation have several different areas and methods between about 90 Mhz - 430 Mhz, and even more below 90 Mhz. Chinese TD-SCDMA is a rival of western 4G netwoks, and it is specially designed not to include western licenses, so it is cheaper then western versions. Japanase iBurst is not anymore developed cell phone standard, it is capable of low data rates and low bandwidths, and it is in use globally. It has good spectral efficiency as 3G standard, in the Wikipedia “spectral efficiency” page, so it is consuming less bandwidth, but 4G standards consume even less. “LTE-Direct” is a phone standard like Motora iDEN where phones contact each other without the need of link tower, range in LTE -Direct is 500 metres. So it is possible to keep infrastructure costs down if phones don`t need link towers so often than they nowadays do and link towers can be sparsely separated. There is a text “An intelligent extracting web content agent on the internet” 2005 MIng-Huey. Using Ogg Opus as speech / music codec and Daala etc. as video codec no license payments are needed for video / audio codecs. However, if there is commercial codec that require license payment as hardware devioce, if that is more efficient than license free codec, license payment price has no signifigance because more efficient data compression helps to bring data rate price down and so it is significantly more important than one 0,5 -1 dollar etc. license price of commercial hardware codec. More efficient compression saves perhaps many dollars per month from data rate costs, and better service and content can now be offered at cost free internet.“Shruti Drishti” is a special web browser for visually impaired text-to-braille coneversion tool, developed for development countries own use. Previously chinese factories manufactured super cheap “wristwatch phones” that were just basic GSM phones without operating system (some had Symbian), phones where wristwatch type, minimal size display, WAP text browser was optional for extra price, and price for phones was 1,35 - 2,5 dollars. But mobile ineternet made these basic phones outdated, and last models were manufactured 2013 - 2014 about. SoC was Coolsand or cheapest Spreadtrum etc. no mali graphics so WAP text browser was only option. MP3 player was however included. Minimum order of quantity was 10 000 - 50 000 phones for super cheap basic phones. Text browser without graphics is still option in cost free internet, together with efficient text compression, without video/graphics processor phones can be made cheaper. However using printed electronics even 7 inch tablet PCs can be made cheaply, display is most expensive component of tablet PC, if that and keyboard (no touchscreen is needed) and battery can be made with roll printing mass production, super cheap tablet PC, that can be used like Google virtual cardboard phone glasses as 3D glasses also, and together with printed electronics made solar panel (solar panel can be on the backside of tablet PC etc.) or using body heat or other heat source as battery charger etc, and cheap lamp (roll printed manufactured) that will bring light at the evening and uses tablet PCs battery. This phone/ tablet PC / 3D or 2D glasses/ lamp combination can be made very cheaply and paid by commercial sponsors and advertisers together with adware, and internet connection (low data bitrate) will be advertisement paid too by commercial sponsors. In third world and poor countries this is possible.Or combination of primitive 2D or 3D video glasses together with “Android TV stick” style cheap Wifi computer stick, that is cheap to manufacture, but this TV stick works as phone/ tablet PC, not just a TV Wifi middleware. This “Wifi computer stick” / cheap video glasses/ headphones / lamp -combination is all that is needed for audio and video communication and light at night. Extra internet time is possible to earn using “advertisement watching work”, watching adverts for hours and earn some money or credit or internet time.
Cheapest Android smart phone in the world is at this moment Nanotel Acche Din in India, price is just 1,3 euros or 99 indian rupees. Previous Android phone record was Freedom 251, price 3 euros. Year ago in India cheapest Android phone cost 24 euros ( Forme P9). Those new phones are being sold well below manufacturing prices, realistic price for Android phone is Docoss X1 that cost 11,5 euros in India. So “real” prices of cheap Android phones have come to more than half in just one year. Cheapest 4G connection cost 2,5 dollar/month (that is not the subscription line price but the cost of whole months use, data downloads and telephone calls included) in India, however that has use restrictions (limited amount of data / calls per month). In Ukraine there is unlimited 10mbits/sec data line only for 3,6 dollar/month price. In Russia one teleoperator tried even better this and tried to offer total cost free telephone connection that was paid by advertisers and was cost free to end user. However that was abonded. So the cost of electronics is coming down quickly and even more when roll printed electronics (displays, touch keyboards and batteries) are reality (those are in fact possible to manufacture already today using roll printing, if someone just start manufacturing them). So manufacturing cheap smart phones (with Symbian, Linux, Android / Brillo, Windows Phone, Firefox OS / X-Pud Linux, Ubuntu Touch, old Nokia Linux + Symbian together OS, whatever OS or even without OS) that are paid by commercial sponsors and advertising money, and net connection that is also free to end user because it is paid by advertisement money. In development countries (where the customers are) this is possible, like examples of India show, but taking the final step to give the phone free and not charging the 1,3 euro price, and free net connection without 2,5 dollar / month- price. Even more data restrictions than there is in 2,5 dollar line cost can be istalled on free net for developing countries if data is packed efficiently by data compression. And limiting the amount of information that can be accessed to cost free net, these are being done already in different free net scenes ( that are not free to end user, teleoperator still charges for line subscription costs each month). Progressively when time passes more and more content can be upgraded to cost free net, but in the beginning it can be very restricted (but cost free to end user). For operating systems: old Nokia S-series OS (S40?, S60?) had strange hybrid Symbian and Linux together- structure, so Symbian and Linux programs can be theoretically run on the same OS, or in old Nokia phone. S60 became Maemo Harmattan, that became Meego, that became Sailfish. If Symbian apps and old Linux desktop PC programs from 1990s / early 2000s can be run on same telephone / laptop, and that OS is simple and not memory consuming (like nowadays phone OSes) that can be one solution for super simple phone OS. For Symbian (and other) phones synth music sound chips such as Vimicro, Macronix, NEC, Oki, Rohm, CS 9236, were manufactured but now only Yamaha and Dream (previously Atmel SAM) remain. Micronas MAS3515G is old german synth sound chip for phones that also includes speech synthesizer. If there would be some standardised synth sound chip in every low cost phone that would bring the phone a musical instrument. Yamaha and Dream /Atmel SAM have been around 20 years and more so combining old versions of their chips together in one new silicon chip (that uses phones DAC etc. resources, 20 years ago there still was not synth on chip solutions for phones except CS9236) and putting that chip inside cheap phones or integrating synth circuit to processor SoC etc, and for more expensive phones including new Yamaha and Dream chips that have better capabilites, for unified standard sound. Or use chinese Vimicro discontinued product that is propably cheap. Or use phone
s MP3 player as wavetable synth as Antti Huovilainen has proposed. For laptops using FPGA circuit as music synth is perhaps best hardware synth option, there are over hundread of FPGA music synth designs and about 100 of them can be grouped to same FPGA processor because most of these designs are old Spartan 3 or earliar Spartan etc. and one Xilinx Virtex, net even new one, can hold about hundread of these in one one FPGA. Old Symbian phones have softsynths for ringtones, standardising these simple few dozen kilobytes cheap synths for one unified standard for super cheap phones help bring musical content to phones. Earlier there were over dozen softsynth manufacturiers that offered simple softsynths for Symbian phones for ringtones and gaming sound etc. but also for musical synth content. Perhaps Sonivox Audionside EAS still remains, others have been forgotten. That Sonivox soft synth has 256 voice maximum polyphony and minimum 64 kilobytes memory requirement. I remember smallest Symbian soft synths had 7 - 17 kilobytes memory requirement to work properly. Combining these old soft synths for phones perhaps several together under one unified phone standard that is cheap and light on resources (memory and computing power) and this standardised softsynth package can be in every cheap phone, among real hardware synth circuits. For Android there is "Android audio sound scape project" at wordpress.com and its "Android audio filter" 2015. Solutions like "Subtractive synthesis without filters", "Polynomial bandlimited step function Poly BLEP", and "Filter-based oscillator algorithms for virtual analog synthesis", and for old fashioned analog technology in electro-music.com/wiki netpages: "Schematics vault" section, such as "Nicolas super simple VCO", "Simple dual A(S)R", "Super simple resonant lowpass filter" etc, but these are for analog technology.Others are Harmony Systems inc. (Delora) VCO, Pigtronix Mothership note recognition system etc for analog tech. Using phones graphics processor (GPU) like Mali in Android for soft synth processing instead of CPU eases phone processor workload, additive synths and others are possible to build using GPU processing. In China (brand name Cheertone) and in India (brand name Prasad) are being sold cheap "educational tablet PCs" for children, these have no internet connection but just run some program content of their own, including simple music synth, and OS is Android. Turning these childrens toys into powerful but cheap music workstations that run Windows Phone 10 that can use Windows desktop PC softsynth programs, or Linux for Linux PC desktop softsynths, is possible, these would be like Plugiator, itself partly India-made product. Ron Kuivila has made FORMULA Forth- based music description language that is compact. More compact would be APL- based music description language, that would be super dense and low memory requirement. Already is plans to use phone`s MP3 player at music hardware synth circuit (Huovilainen), and is possible to combine many audio compression circuits to one simplified circuit structure (for example MP3 and AAC using partially same circuits for cost effective audio multi codec player). Some delta-sigma modulator types use ringmodulator (or ring oscillator), and as delta-sigma modulators are used at cheap A/D converters these ringmodulators (ring oscillators) in D-S circuit can be used as musical instruments, because hardware music synths use ring modulation. In tinyapps.org are small programs such as Tiny Piano (19 kilobytes) and Synfactory modular synth (119 kilobytes), improved audio / video version is called Studiofactory, these small programs would be ideal for mobile phones. Earlier Symbian phones utilised cheap softsynths which are listed in “Mobile audio technology report and recommendetations” 2007. Modern phone softsynths studies are such as different writings by Jari Kleimola, for example “Logical synth”, and “MOMU: a mobile music toolkit”, “mobile phone XMF extensible music format”. Texas Instruments TMS 320 was released 33 years ago and is still one of the most popular DSPs. There are versions of it that combine ARM core together with TMS 320 DSP, such as TI OMAP, Da Vinci, DA25x (that combines ARM processor and TMS 320 audio processor) and TMS DM series. Abot 20 year ago first ARM7 + C54x series TMS 320 appeared. Older music synthesizers used only one TMS 320 DSP, like Nord Micro Modular and others. TMS 320 is also used as video DSP, and earlier TMS320 together with ARM core was used in mobile phones, for video processing. Because TMS 320 video processor and audio processor share common features, and TMS 320 was used in many old music synthesizers, and unified ARM core and TMS 320 combination existed already about 20 years ago, building cheap mobole phone processor that combines ARM core together with TMS 320 DSP for video processing, but the same TMS 320 circuit that video processing uses is also used, with slight modifications, as music synthesizer that can represent the processing power of Clavia Micro Modular 20 years ago for example. It would be Android phone that has ARM processor but instead of Mali video processing it would have TMS320 based unified video and audio processor and that unified audio and video processor is capable of using for example old Nord Micro Modular software and other old one TMS 320 processor- synthesizer software. The result would be cheap mobile phone that uses TMS 320 instead of Mali as graphics but also as a powerful professional grade sound synthesizer that costs only few dollars. And because modern processor has much bigger transistor count and huge speed improvements over 20 year old designs that were manufactured at 350 nm or 250 nanometer technology, audio processor capacity would require only few percent of TMS320 video processor resources, but still audio processing efficiency is in the level of old late 1990s - early 2000s TMS320 audio processors. Even multiple processor synths like Korg Oasys PC card from the year 2000 that had 4 +1 TMS320 could work on cheap modern mobile phone ARM processor with TMS320 video processor instead of Mali- combination if TMS320 has capacity to process audio also. So cheap few dollar price feature phone could have sound synthesis capabilities that old expensive hardware synths had about 20 years ago. But perhaps extra payment license is needed if user wants to use sophisticated synth software such as Nord Micro Modular or Korg Oasys PC card software on mobile phone. However good hardware synth is included in feature phone if TMS320 is used, and freeware synth programs for it are possible. Because new phone SoCs have MP3 player included, TMS320 audio capabilities can be totally concentrated in sound synthesis if MP3 audio decoding is done at special MP3 player circuit that the phone SoC has anyway. Even MP3 player circuit can be used, with slight modifications, as music synth. Cheapest chinese toy electric pianos are such as Peng Zhan (or Peng Jia) 168B, that earlier cost only 1,65 dollars at cheapest to buy one piece, and that cost even included shipping that one piece to overseas, can be used as super cheap musical instruments for example putting cheap microcontroller inside and microcontroller is programmed as music synth, or small amount of memory inside toy keyboard and using that keyboard as sample player etc. These super cheap keyboards as “real” musical instruments (not just as toys) would have a marketplace at the third world. For making net connection to phones cheaper: “puggle.me” app (that program is on Github so it is perhaps not ready yet) type automated searching for cheapest net connection, and Jana / mCent net app that makes toll free internet connections possible, should be in every cheap phone. There is article “On the role of infrastructure sharing for mobile network operators” by D. E. Meddeur.
For video compression if data rates are going to be minimal, one solution is video super-resolution that expands very low pixel count picture to larger level. For example if 96 x 128 pixels is smallest possible quality, video and image super- resolution could make quite acceptable quality picture of low data bitrate transmission. Not only pixels, but colour value of each pixel and contrast can be downscaled also, and the same method that is used in pixel count increasing can be used on colour bitrate increasing and improved contrast / luminence quality. For transmission video stream or still image if it is downgraded to minimum 96 x 128 pixels, colour value per pixels downgraded also, and luminence / contrast values to minimum. Video / image super- resolution hardware in the phone reconstructs the original picture or video in original pixel count and colour and contrast levels that video steram had before downgrading. Altough original quality is not achieved and information is lost , quality is much better than downgraded 96 x 128 pixels with minimal colour and contrast values. Even in mobile phones are marketed today video and image super-resolution software, and specific hardware processors such as “Xevic image processing on Fujitsu phones”, and Synthesis Corporation Super Resolution Scaler for Mali graphics Android processors. However also colour and contrast values could be “super-resoluted”, not only pixel count increased. for simple implementation: “Low complexity image / video super-resolution using edge and nonlinear constraint.”, “Primitive solution of video super-resolution” Devi 2012. Many commercial solutions for image and video super resolutiona are being sold: vReveal, CEVA multi-image XM4, Neuron Doubler, Video Enhancer, MDSP resolution enhancement software, Multi-frame super resolution toolbox, MSU super-resolution filter, Morpho super-resolution, AMD virtual super resolution, Amped Five, Topaz Enhance, Sony super resolution de-mosaicing processor, Almalence super resolution zoom, AKVIS magnifier, Nvidia dynamic super resolution, “NTT Docomo over complete transform and improved image super-resolution”, SuperResolution Plugin, Sourceforge super resolution free download, Keitoku Giken FE-R1EX processor. If 96 x 128 pixels can`t obtain enough information from picture because artifacts in picture are so small that low pixel count destroys information, video and still pictures must be “zoomed” to such a level inside the widescreen picture frame that super resolution can bring acceple levels of results when the video or still picture is decompressed and pixel count increased after superresolution treatment. This zooming can be made automatically by some computer program, but if it is not a direct live transmission, some person who monitores the quality of input and makes adjustments and “zooms” the picture when needed if video suffers from pixelation even after super resolution treatment. Of course information outside zoomed area of widescreen picture is lost to viever if 96x 128 pixelation is used, but at least inside the zoomed area picture quality is good and video super resolution can represent decent video stream. Other ways to make bitrate even lower is “Video compression with colour quantization and dithering” Raja. For colours japanese “Practical colour coordinate system” and RG system that uses only 2 colours or swedish Ikaros project RGi (RG + luminence) . Also using continously changing display pixel accuracy, for example changing between low 64 x 48 pixels to 120 x 200 for each keyframe of video, now video quality changes constantly even subsecond time, video stream blurs and sharpens constanly and also zoom is pumping trying to keep quality of video acceptable, but at least that kind of “variable pixel rate” helps keep bitrate to minimum, only that minimum amount of pixels needed for each keyframe that manages to make video at least somewhat accpetable is needed for transmission. Video super-resolution hardware in the phone extends pixel count to normal TV transmission levels, or at least 120 x160, and also increases color values and contrast that is in downgraded video stream dropped to minimum level. This variable pixel rate minimum pixel count, and also colours and contrast per pixel, and would be “minimal video and image codec” for super low bitrate transmission, also using same video compression methods that standard video codecs (libde265 etc.) do after this video downgrading bitrate drops to absolute minimum. So this is super resolution method for pixels, colours and contrast added together with conventional video compression for really super low bitrate. The pixel count may vary also on output stage, for example regular TV quality 480 x 600 pixelation can drop as low as 120 x 160 sometimes, on display screen. So video super- resolution takes low variable pixel count 48 x 64 to 120 x 160 about input with minimal colour and contrast values, automatically or manually by some person who monitors the input zooms inside large widescreen frame if pixelation destroys information, video superresolution corrects colour and contras values back to TV quality level and pixel count also, but sometimes when processor cannot hold the workload pixel count of the display downgrades even down to 120 x 160 level. So the displayed video stream blurs and sharpens constantly as information in video stream changes, zoom is pumping constantly and also pixel count of the display suddenly changes from TV quality to low display pixelation and back, but at least data rate of this type of video / image super- resolution codec would be super low bitrate, because super- resolution hardware does video restoration work and tries to present video stream as such as it was before downgrading process that drops pixel count to very low for transmission and drops colour and contrast values to minimum also.