> I dont think I've heard if the history of the technology behind cds. Was it SRI? I only thought the first cdrom software at least was that encyclopedia on CD? > This being 14" just sounds like a disk platter.
It's obviously not a CD. It might be just a brown disk with scratches, being sold as something unusual to the gullible. Or it might be an optical disk of some sort, but not all optical disks are CDs. This. That disc has absolutely +nothing+ in common with a "CD", barring the fact that it (apparently) uses a laser-ablation process to write pits / bits onto a rotating medium. We should all know by now that the original (redbook) 120mm optical CD was a joint project between Sony & Philips. These folks may have been co-developing a similar technology, but any association with the Sony / Philips product is pure fantasy. So what do we have, here.. a confused but earnest dreamer with dollar signs in his eyes, or an outright conman? Either way, hopefully he doesn't reel in any suckers.. or dog forbid any Minnesota walleye. =/ On Fri, Jul 28, 2017 at 11:02 AM, Al Kossow via cctalk < email@example.com> wrote: > > > On 7/28/17 8:30 AM, Al Kossow via cctalk wrote: > > > > > > On 7/28/17 8:20 AM, Al Kossow via cctalk wrote: > > > >>> I dont think I've heard if the history of the technology behind cds. > Was it SRI? > > > > Sony. > > They wrote a book about it. > > > > > > actually this was the book I was thinking of > > Martin, "The Complete Compact Disc Player" > 1987 0-13-159294-7 > > Both Philips (NV Philips Gloeilampenfabrieken) of the Netherlands and > Japan's Sony > Corp. made individual contributions to the production of the compact disc > and player. > Philips began efforts to develop a compact disc in 1969, but it required > ten years of > effort before it could show the first working system to the European press. > > Philips' contribution was the creation of a video disc system using > tracking by > means of a laser beam. With this as a basis, Philips then developed a more > compact > version for sound reproduction. Sony added to the technology through its > research on > data coding and error correction circuitry. Without these advances by > Sony, reproduction > of the audio signal would not have been possible. Error correction > circuitry helps > to ensure correct reproduction of sound even when the compact disc is > plagued with > fingerprints due to disc handling, dust, scratches on the discs, and > defects occurring > during manufacturing. > > Since Sony and Philips were the prime movers toward the compact disc > format, > we can better appreciate their efforts as shown in the following timetable. > > DEVELOPMENT OF THE COMPACT DISC: A HISTORICAL PERSPECTIVE > > 1928 Harry Nyquist establishes mathematically that the sampling > rate of an analog audio waveform must be twice the highest > frequency of the wave being sampled. > > 1939 Pulse code modulation invented by H. A. Reeves. > > 1969 Philips Research Laboratories begins work on optical disc > recording of video, audio, and data. > > 1972 First public demonstration of optical disc recording (VLP, > the future LaserVison > > 1973/74 Requirements established for video, audio, and data recording. > Philips' associate, Polygram, producer of first laser-read > discs becomes full participant. > > 1974 Sony develops stationary-head digital audio recorder > > 1975 Philips begins development of industrial disc mastering > equipment > > 1976 Sony produces first digital audio disc system based on FM > video format. The disc rotated at 1800 rpm, supplied 30 > minutes of music on one side, and used an optical readout > system. > > 1976 Conception of small diameter (compact) disc defines digital > audio project parameters > > 1977 Sony announces digital audio processor to be coupled with a > video tape recorder for 12-bit quantized, two-channel > recording and playback. > > 1977 Sony creates the first consumer digital audio processor. It > was called the PCM-l and. it recorded digital pulse signals > on video cassettes > > 1977 JVC develops its first pulse code modulation digital audio > processor. The company begins to provide professional > digital recording technologies used in recording studios > throughout the world. > > 1977 In cooperation with NHK, Sony develops a digital audio > processor for use with a professional U-matic videocassette > recorder. > > 1977 Sony markets the world's first consumer digital audio > processor for use with the Betamax home videocassette > recorder. > > > 1977 Sony makes available a digital audio disc system employing > a pulse code modulation direct recording method. The disc > rotated at 900 rpm and supplied 1 hour of recording and > playback per side. It used an optical readout system. > > 1978 After further technological advances, Philips defines Compact > Disc as a digital audio system to reproduce one hour of > stereo sound on one side. Efforts continue to develop > commercially viable lasers, optics, ICs, disc mastering, and > production equipment. > > 1978 The world's first broadcast of digitally recorded programs is > made through Japan's four major FM networks > > 1978 Sony develops a long-playing digital audio disc system with > the disc rotating at 450 rpm. The unit used an optical > readout system and played 150 minutes per side. > > 1978 Sony announces the development of a stationary-head digital > audio recorder using 1/4-inch tape > > 1979 Philips shows working model of their Compact Disc player > to press at Eindhoven, The Netherlands. Five months later > and ten years after research began in Eindhoven, Sony signs > agreement to cooperate in further system development with > the aim of making Compact Disc the world standard for > digital audio. > > 1980 Philips, Polygram, and Sony agree to Compact Disc System > and submit it to Digital Audio Disc Committee in Japan. > > 1980 Sony announces the compact disc digital audio system, > jointly developed by Sony and Philips at the Japan Audio > Fair. In their research program, Philips investigated the basic > operating principles and designed the hardware. Sony's > contribution centered mainly on the development of software > including the signal processing method. > > 1981 With several digital audio disc systems being promoted, > Matsushita adopts the Compact Disc. It is now certain to be > a world standard. > > 1982 Virtually all the world's major audio manufacturers are > among 30 player and 10 disc licensees. Development of car > Compact Disc started by Philips > > 1983 Compact Disc arrives on the commercial market. Players > and discs are offered for sale throughout the world > > 1985 More than 90 system partners worldwide; 54 hardware and > 38 licensees. > > > > > > > > > > > >