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.
