When was the CD invented?
Compact disc
Compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony and released in 1982. The format was originally developed to store and play only sound recordings (CD-DA) but was later adapted for storage of data (CD-ROM). Several other formats were further derived from these, including write-once audio and data storage (CD-R), rewritable media (CD-RW), Video Compact Disc (VCD), Super Video Compact Disc (SVCD), Photo CD, PictureCD, CD-i, and Enhanced Music CD. The first commercially available audio CD player, the Sony CDP-101, was released October 1982 in Japan.
Sound recording and reproduction
The advent of digital sound recording and later the compact disc (CD) in 1982 brought significant improvements in the durability of consumer recordings. The CD initiated another massive wave of change in the consumer music industry, with vinyl records effectively relegated to a small niche market by the mid-1990s. However, the record industry fiercely resisted the introduction of digital systems, fearing wholesale piracy on a medium able to produce perfect copies of original released recordings. However, the industry succumbed to the inevitable, though using various protection system (principally Serial Copy Management System, or SCMS).
The most recent and revolutionary developments have been in digital recording, with the development of various uncompressed and compressed digital audio file formats, processors capable and fast enough to convert the digital data to sound in real time, and inexpensive mass storage
. This generated new types of portable digital audio players. The minidisc player, using ATRAC compression on small, cheap, re-writeable discs was introduced in the 1990s but became obsolescent as solid-state non-volatile flash memory dropped in price. As technologies that increase the amount of data that can be stored on a single medium, such as Super Audio CD, DVD-A, Blu-ray Disc, and HD DVD become available, longer programs of higher quality fit onto a single disc. Sound files are readily downloaded from the Internet and other sources, and copied onto computers and digital audio players. Digital audio technology is now used in all areas of audio, from casual use of music files of moderate quality to the most demanding professional applications. New applications such as internet radio and podcasting have appeared.
Cassette tape
The mass production of blank (recordable) Compact Cassettes began in 1964 in Hanover, Germany. Prerecorded music cassettes (also known as "Music-Cassettes", and later just Musicassettes; M.C. for short) were launched in Europe in late 1965. The Mercury Record Company, a US affiliate of Philips, introduced M.C. to the US in July 1966. The initial offering consisted of 49 titles.
However, the system had been designed initially for dictation and portable use, with the audio quality of early players not well suited for music. Some early models also had an unreliable mechanical design. In 1971, the Advent Corporation introduced their Model 201 tape deck that combined Dolby type B noise reduction and chromium(IV) oxide (CrO) tape, with a commercial-grade tape transport mechanism supplied by the Wollensak camera division of 3M Corporation. This resulted in the format being taken more seriously for musical use, and started the era of high fidelity cassettes and players.
Sound recording and reproduction
The first practical sound recording and reproduction device was the mechanical phonograph cylinder, invented by Thomas Edison in 1877 and patented in 1878. The invention soon spread across the globe and over the next two decades the commercial recording, distribution, and sale of sound recordings became a growing new international industry, with the most popular titles selling millions of units by the early 1900s. The development of mass-production techniques enabled cylinder recordings to become a major new consumer item in industrial countries and the cylinder was the main consumer format from the late 1880s until around 1910.
Gaston Bastiaens
From 1988–92 Bastiaens was general manager and director of the Multimedia Division of Philips Consumer Electronics. Jan Timmer, then Philips' head of Consumer Electronics, gave him four months to make or break the Compact Disc Interactive (CD-I) project, a joint effort between Sony and Philips to enhance the CD standard with multi-media technology. This so-called "Green Book" standard had been in development since 1985 but was still in the concept phase when Bastiaens took charge. He started out by changing the project to "full motion video", which would enable a CD-I disc to hold a full-length feature movie but was rather ambitious at the time, as the compression and decoding hard- and software had yet to be developed. The success of the project also hinged on the creation of software and tools to create the content which would be essential in driving the market. Bastiaens moved the project into the MPEG standard, getting Philips more actively involved in that technology. By the time the first CD-I products where launched in 1992, using the MPEG-1 standard for video, development of MPEG-2 technology was well under way for the upcoming DVD technology, which used a red laser for encoding more than eleven times as much information on a disk of the same size as a CD, which used a yellow laser.
Compact disc
The digital data on a CD begins at the center of the disc and proceeds toward the edge, which allows adaptation to the different size formats available. Standard CDs are available in two sizes. By far, the most common is in diameter, with a 74- or 80-minute audio capacity and a 650 or 700 MiB (737,280,000-byte) data capacity. The official Philips history says this capacity was specified by Sony executive Norio Ohga so as to be able to contain the entirety of Beethoven's Ninth Symphony on one disc. This is a myth according to Kees Immink, as the code format had not yet been decided in December 1979. The adoption of EFM in June 1980 would have allowed a playing time of 97 minutes for 120 mm diameter or 74 minutes for a disc as small as 100 mm, but instead the information density was lowered by 30% to keep the playing time at 74 minutes. The 120 mm diameter has been adopted by subsequent formats, including Super Audio CD, DVD, HD DVD, and Blu-ray Disc. The 80 mm diameter discs ("Mini CDs") can hold up to 24 minutes of music or 210 MiB.
Compact disc
At the time of the technology's introduction in 1982, a CD could store much more data than a personal computer hard drive, which would typically hold 10 MB. By 2010, hard drives commonly offered as much storage space as a thousand CDs, while their prices had plummeted to commodity level. In 2004, worldwide sales of audio CDs, CD-ROMs and CD-Rs reached about 30 billion discs. By 2007, 200 billion CDs had been sold worldwide.
Digital Audio Tape
One of the most significant examples of a PCM adaptor-based system was the Sony PCM-1600 digital audio mastering system, introduced in 1978. The PCM-1600 used a U-Matic-format VCR for its transport, connected to external digital audio processing hardware. It (and its later versions such as the PCM-1610 and 1630) was widely used for the production and mastering of some of the first Digital Audio CDs in the early 1980s. Once CDs were commercially introduced in 1982, tapes recorded on the PCM-1600 were sent to the CD pressing plants to be used to make the glass master disc for CD replication.
New Ideas
CD
Toshitada Doi
He joined Sony Japan in 1964 and started the first digital audio project within Sony. He was the driving force behind the PCM adaptor, and was a prominent member of the Sony/Philips taskforce responsible for the design of the Compact Disc. He created, among others, the CIRC error correction system. He, with Kees Immink, refutes the myth that the Compact Disc's playing time was determined by Beethoven's Ninth Symphony.
Compulsory dance
The first CDs were developed during the 1930s by teams from Great Britain, who dominated ice dance for most of the early years after the sport was contested at the World Championships in 1952. The CD's prominence in ice dance slowly declined, until it was removed and replaced by the short dance (SD) in 2011, the same year the ISU voted to follow the structure of ice dance competitions by eliminating the CD and original dance (OD) and include the SD and free dance (FD).
Optical disc
The CD-ROM format was developed by Sony and Denon, introduced in 1984, as an extension of Compact Disc Digital Audio and adapted to hold any form of digital data. The same year, Sony demonstrated a LaserDisc data storage format, with a larger data capacity of 3.28 GB.
CD player
Sony released its CDP-101 CD player in 1982 with a slide-out tray design for the CD. As it was easy to manufacture and to use, most CD player manufacturers stayed with the tray style ever since. However, there have been some notable exceptions.
Guillermo Cides
In 1994, the sound engineer Guillermo Zuloaga asked him to produce his first solo CD which was edited at the end of 1994, called The Inner World of the Planets. It is considered to be a significant CD inside the world of the Stick. The inventor of the instrument Emmett Chapman wrote to Cides in a letter: " ... you have made real what I had in mind when I designed this instrument " after listening to his first work.
Technological and industrial history of 20th-century Canada
The compact disc (CD) and the digital video disc (DVD) were introduced at this time. The CD, which appeared in 1982, became a favourite format for musical recordings. By 1986 most music stores in Canada had phased out the LP and replaced it with the CD. It was also used for other purposes including data storage in the form of the CD-ROM. A closely related format, the DVD, with greater storage capacity than the CD, was introduced in 1997. In 1986, Americ Disc of Drummondville, Quebec began to manufacture CDs and after 1997, DVDs and has become one of the largest suppliers of this product in North America. The infrared-based TV remote control became popular with Canadians in the early 1980s.
History of radar
In early 1938, Butement started the development of a CD system based on Bowen's evolving 200-MHz (1.5-m) airborne sets. The transmitter had a 400 Hz pulse rate, a 2-μs pulse width, and 50 kW power (later increased to 150 kW). Although many of Bowen's transmitter and receiver components were used, the system would not be airborne so there were no limitations on antenna size.
Primary credit for introducing beamed RDF systems in Britain must be given to Butement. For the CD, he developed a large dipole array, high and wide, giving much narrower beams and higher gain. This could be rotated at a speed up to 1.5 revolutions per minute. For greater directional accuracy, lobe switching on the receiving antennas was adopted. As a part of this development, he formulated the first – at least in Britain – mathematical relationship that would later become well known as the “radar range equation”.
History of sound recording
Although a number of short-lived "hybrid" studio and consumer technologies appeared in this period (e.g. Digital Audio Tape or DAT, which recorded digital signal samples onto standard magnetic tape), Sony assured the preeminence of its new digital recording system by introducing, together with Philips, the most advanced consumer audio format to date — the digital compact disc (CD). The Compact disc rapidly replaced both the 12" album and the 7" single as the new standard consumer format, and ushered in a new era of high-fidelity consumer audio — CDs were small, portable and durable, and they could reproduce the entire audible sound spectrum, with unrestricted dynamic range, perfect clarity and no distortion. Because CDs were encoded and read optically, using a laser beam, there was no physical contact between the disc and the playback mechanism, so a well-cared-for CD could be played over and over, with absolutely no degradation or loss of fidelity. CDs also represented a considerable advance in both the physical size of the medium, and its storage capacity — LPs could only practically hold about 50 minutes of audio, because they were physically limited by the size of the disc itself and the density of the grooves that could be cut into it — the longer the recording, the closer together the grooves and thus the lower the overall fidelity; CDs, on the other hand they were less than half the overall size of the old 12" LP format, but offered about double the duration of the average LP, with up to 80 minutes of audio.
CDJ
The CDJ-1000 (retroactively known as the mk1 after the release of mk2) was a digital turntable by Pioneer Electronics in 2001 that was used to play CDs and was generally accepted as the first CD player that can accurately emulate a vinyl turntable - including the ability to scratch - and became a popular CD player used by DJs.
Meridian Audio
The company was the first to introduce active loudspeakers (loudspeakers with power amplifiers inside the cabinet) designed for the domestic market, and was the first British company to manufacture a CD player in 1983. The Meridian MCD, launched in 1985, was the first audiophile CD player. In his review of the MCD, audio engineer and "Stereophile" founder J. Gordon Holt wrote, "For the first time, the sound of the best CDs (Telarcs, RealTimes and Sheffields) is truly liquid and transparent, with an effortlessness that I have not previously heard except from the better analog sources... To date, then, this is the best-sounding CD player I've encountered." Meridian also created the first digital surround-sound processor and the first DSP-based digital active loudspeakers.
High Definition Compatible Digital
Originally developed by Pacific Microsonics, the first HDCD-enabled CD was released in 1995. In 2000, the technology was purchased by Microsoft, and the following year, there were over 5,000 HDCD titles available. Microsoft's HDCD official website was discontinued in 2005; by 2008, the number of available titles had declined to around 4,000.
CD player
Philips established the Polydor Pressing Operations plant in Langenhagen near Hannover, Germany, and quickly passed a series of milestones.The Japanese launch was followed in March 1983 by the introduction of CD players and discs to Europe and North America (where CBS Records released sixteen titles). This event is often seen as the "Big Bang" of the digital audio revolution. The new audio disc was enthusiastically received, especially in the early-adopting classical music and audiophile communities, and its handling quality received particular praise. As the price of players gradually came down, and with the introduction of the portable Walkman, the CD began to gain popularity in the larger popular and rock music markets. The first artist to sell a million copies on CD was Dire Straits, with their 1985 album "Brothers in Arms". The first major artist to have his entire catalogue converted to CD was David Bowie, whose 15 studio albums were made available by RCA Records in February 1985, along with four greatest hits albums. In 1988, 400 million CDs were manufactured by 50 pressing plants around the world.
The CD was planned to be the successor of the gramophone record for playing music, rather than primarily as a data storage medium; but from its origins as a musical format, CDs have grown to encompass other applications. In 1983, following the CD's introduction, Immink and Braat presented the first experiments with erasable compact discs during the 73rd AES Convention. In June 1985, the computer-readable CD-ROM (read-only memory) and, in 1990, CD-Recordable were introduced, also developed by both Sony and Philips. Recordable CDs were a new alternative to tape for recording music and copying music albums without defects introduced in compression used in other digital recording methods. Other newer video formats such as DVD and Blu-ray use the same physical geometry as CD, and most DVD and Blu-ray players are backward compatible with audio CD.
Countercurrent chromatography
The predecessor of modern countercurrent chromatography theory and practice was countercurrent distribution (CCD). The theory of CCD was described in the 1930s by Randall and Longtin. Archer Martin and Richard Laurence Millington Synge developed the methodology further during the 1940s. Finally, Lyman C. Craig introduced the Craig countercurrent distribution apparatus in 1944 which made CCD practical for laboratory work. CCD was used to separate a wide variety of useful compounds for several decades.
Digital photography
The real history of digital photography as we know it began in the 1950s. In 1951, the first digital signals were saved to magnetic tape via the first video tape recorder. Six years later, in 1957, the first digital image was produced through a computer by Russell Kirsch. It was an image of his son. In the late 1960s, Willard S. Boyle and George E. Smith, two physicists with Bell Labs, Inc., invented the charge-coupled device (CCD), a semiconductor circuit later used in the first digital video cameras for television broadcasting. Their invention was recognized by a Nobel Prize in Physics in 2009. The first published color digital photograph was produced in 1972 by Michael Francis Tompsett using CCD sensor technology and was featured on the cover of "Electronics Magazine". It was a picture of his wife, Margaret Thompsett.
The Cromemco Cyclops, a digital camera developed as a commercial product and interfaced to a microcomputer, was featured in the February 1975 issue of "Popular Electronics" magazine. It used metal-oxide semiconductor (MOS) technology for its image sensor.
Philips CD-i
Recognizing the growing need among marketers for networked multimedia, Philips partnered in 1992 with Amsterdam-based CDMATICS to develop TeleCD-i (also TeleCD). In this concept, the CD-i player is connected to a network such as PSTN or Internet, enabling data-communication and rich media presentation. Dutch grocery chain Albert Heijn and mail-order company were early adopters and introduced award-winning TeleCD-i applications for their home-shopping and home-delivery services. CDMATICS also developed the special Philips TeleCD-i Assistant and a set of software tools to help the worldwide multimedia industry to develop and implement TeleCD-i. TeleCD-i is the world's first networked multimedia application at the time of its introduction. In 1996, Philips acquired source code rights from CDMATICS.
Pulse-code modulation
The compact disc (CD) brought PCM to consumer audio applications with its introduction in 1982. The CD uses a 44,100 Hz sampling frequency and 16-bit resolution and stores up to 80 minutes of stereo audio per disc.
Camera
The first camera using digital electronics to capture and store images was developed by Kodak engineer Steven Sasson in 1975. He used a charge-coupled device (CCD) provided by Fairchild Semiconductor, which provided only 0.01 megapixels to capture images. Sasson combined the CCD device with movie camera parts to create a digital camera that saved black and white images onto a cassette tape. The images were then read from the cassette and viewed on a TV monitor. Later, cassette tapes were replaced by flash memory.
List of Dutch inventions and innovations
EFM (Eight-to-Fourteen Modulation) was invented by Dutch electrical engineer Kees A. Schouhamer Immink in 1985. EFM is a data encoding technique – formally, a channel code – used by CDs, laserdiscs and pre-Hi-MD MiniDiscs.
Charge-coupled device
The first working CCD made with integrated circuit technology was a simple 8-bit shift register. This device had input and output circuits and was used to demonstrate its use as a shift register and as a crude eight pixel linear imaging device.
Development of the device progressed at a rapid rate. By 1971, Bell researchers led by Michael Tompsett were able to capture images with simple linear devices.
Several companies, including Fairchild Semiconductor, RCA and Texas Instruments, picked up on the invention and began development programs. Fairchild's effort, led by ex-Bell researcher Gil Amelio, was the first with commercial devices, and by 1974 had a linear 500-element device and a 2-D 100 x 100 pixel device. Steven Sasson, an electrical engineer working for Kodak, invented the first digital still camera using a Fairchild CCD in 1975. The first KH-11 KENNEN reconnaissance satellite equipped with charge-coupled device array ( pixels) technology for imaging was launched in December 1976. Under the leadership of Kazuo Iwama, Sony also started a large development effort on CCDs involving a significant investment. Eventually, Sony managed to mass-produce CCDs for their camcorders. Before this happened, Iwama died in August 1982; subsequently, a CCD chip was placed on his tombstone to acknowledge his contribution.
History of radar
For coastal defense by the Canadian Army, a 200 MHz set with a transmitter similar to the Night Watchman was developed. Designated CD, it used a large, rotating antenna atop a wooden tower. The CD was put into operation in January 1942.
Photo CD
The Photo CD system was announced by Kodak in 1990. Photo CD targeted a full range of photographic needs, ranging from consumer level point-and-shoot cameras to high-end professionals using large format 4x5 sheet film. The first Photo CD products, including scanners for processing labs and Photo CD players for consumers, became available in 1992. The project was expected to be a $600 million business by 1997 with $100 million in operational earnings. Kodak entered into a number of partnerships grow the usage of Photo CD. This included, for example, an arrangement with L.L. Bean in 1992 by which the catalog would be distributed in Photo CD format, and an arrangement with Silicon Graphics in 1993 to make all Silicon Graphics image-processing workstations capable of accepting Kodak Photo CD optical disks. These measures, together with the then relatively low cost of $3 per image and convenience, made Photo CD the digital imaging solution of choice for many photographers in the mid to late 1990s.
Video CD
LaserDisc was first available on the market, in Atlanta, Georgia, on December 15, 1978. This disc could hold an hour of analog audio and video (digital audio was added a few years later) on each side. The Laserdisc provided picture quality nearly double that of VHS tape and analog audio quality far superior to VHS.
Mini CD
When Mini CDs were first introduced in the United States, they were initially marketed as CD3, in reference to their approximate size in inches; larger CDs were called CD5, despite the fact that both CD specifications are defined solely in terms of metric units. Now, they are known as either Mini CDs or 80 mm CDs.
Mini CD
The first shirt-pocket CD player was the Sony D-88 (ca. 1990). It only played standard PCM audio (Red Book) CDs. It could play 120 mm discs if a guard was moved to allow the disc to protrude from the unit.
CD player
The Sony CDP-101, released in 1982, was the world's first commercially released compact disc player.
AppleCD
The AppleCD SC was the first CD-ROM by Apple Computer Company, introduced in 1988. It originally contained a fan but in 1990 they removed it because it was unneeded and attracted dust onto the optical disk head which could cause problems. It uses a front-loading caddy 1x CD-ROM and is only capable of Read Only Media. This accessory device was only able to read compact disks up to a 650 MB capacity in five formats, CD-Audio, CD-ROM, HFS, ProDOS, and High Sierra. On the front of the device it has an eject button, mini-phono sound out jack, and a volume knob. On the rear it has a power switch, power input, two Centronics 50-pin SCSI outputs, and an audio RCA connector. With appropriate software it would run on any Macintosh with a DB-25 connector, or an Apple II with an Apple II SCSI interface card.
Jordi Ustrell Aguilà
The development in 1982 of the Compact Disc (CD) by Sony and Philips, and its later version designed to contain date, the CD-ROM, drew the attention of Publishing Companies due to the large capacity and low cost of these discs. At this time, Publisher Marin founded an engineering company called "ComCal" SA with the objective of making major reference works and large document datebases available through microcomputers. Jordi Ustrell had been the technical director of the Company since its foundation.
Compact disc
Philips established the Polydor Pressing Operations plant in Langenhagen near Hannover, Germany, and quickly passed a series of milestones.
The Japanese launch was followed in March 1983 by the introduction of CD players and discs to Europe and North America (where CBS Records released sixteen titles). This 1983 event is often seen as the "Big Bang" of the digital audio revolution. The new audio disc was enthusiastically received, especially in the early-adopting classical music and audiophile communities, and its handling quality received particular praise. As the price of players gradually came down, and with the introduction of the portable Discman the CD began to gain popularity in the larger popular and rock music markets. One of the first CD markets was devoted to reissuing popular music whose commercial potential was already proven. An advantage of the format was the ability to produce and market boxed sets and multi-volume collections. The first artist to sell a million copies on CD was Dire Straits, with their 1985 album "Brothers in Arms". The first major artist to have their entire catalogue converted to CD was David Bowie, whose first fourteen studio albums of (then) sixteen were made available by RCA Records in February 1985, along with four greatest hits albums; his fifteenth and sixteenth albums had already been issued on CD by EMI Records in 1983 and 1984, respectively. On February 26, 1987, the first four UK albums by The Beatles were released in mono on compact disc. In 1988, 400 million CDs were manufactured by 50 pressing plants around the world.
Kees Schouhamer Immink
Around 1976, Philips and Sony showed prototypes of digital audio disc players, which were based on optical videodisc technology. In the interview by Tekla Perry for the IEEE Spectrum, May 2017, Immink explains that he got involved in the CD project at the end of 1979 when Sony and Philips had decided to jointly settle one design. Both Philips and Sony had shown prototype CD players to the press in 1978. The team at Philips, he says, "needed someone to do measurements of the two competing systems, the quality, how they coped with scratches, how they coped with imperfections of the disc. My job with the LaserDisc was finished, so I said, 'Sure, I could do it.'" Both Philips and Sony had come up with different rules for translating digital audio data to sequences of pits and lands. After a lot of experimentation, Immink improved the playing time by thirty percent by inventing a code that could better cope with the servo systems. The encoding system Immink devised came to be called Eight-to-fourteen modulation (EFM).
DVD
DVD (an abbreviation of digital versatile disc) is a digital optical disc storage format invented and developed in 1995. The medium can store any kind of digital data and is widely used for software and other computer files as well as video programs watched using DVD players. DVDs offer higher storage capacity than compact discs while having the same dimensions.
CD publishing
The term "CD publishing" is believed to have been coined by the Rimage Corporation as part of a marketing program which referred to CD-R discs as "digital paper." Automated disc production and printing systems, such as those made by Rimage, can be shared on a computer network much like an office printer to facilitate the creation of unique discs. This is the root of both the digital paper and CD publishing terms.
LaserDisc
LaserDisc was first available on the market, in Atlanta, Georgia, on December 11, 1978, two years after the introduction of the VHS VCR, and four years before the introduction of the CD (which is based on laser disc technology). Initially licensed, sold, and marketed as "MCA DiscoVision" (also known as simply ""DiscoVision"") in 1978, the technology was previously referred to internally as "Optical Videodisc System", "Reflective Optical Videodisc", "Laser Optical Videodisc", and "Disco-Vision" (with a dash), with the first players referring to the format as ""Video Long Play"".
Cassette tape
The compact cassette technology was originally designed for dictation machines, but improvements in fidelity led the Compact Cassette to supplant the Stereo 8-track cartridge and reel-to-reel tape recording in most non-professional applications. Its uses ranged from portable audio to home recording to data storage for early microcomputers. The first cassette player (although mono) designed for use in car dashboards was introduced in 1968. Between the early 1970s and the early 2000s, the cassette was one of the two most common formats for prerecorded music, first alongside the LP record and later the compact disc (CD).
History of optical storage media
Although research into optical data storage has been ongoing for many decades, the first popular system was the Compact Disc, introduced in 1982, adapted from audio (CD-DA) to data storage (the CD-ROM format) with the 1985 "Yellow Book", and re-adapted as the first mass market optical storage medium with CD-R and CD-RW in 1988. Compact Disc is still the "de facto" standard for audio recordings, although its place for other multimedia recordings and optical data storage has largely been superseded by DVD.
Find the Colour
CD
CD player
A 2005 book stated that after Apple Computers entered the music industry, within ten years it became the dominant seller of portable digital audio music players (its iPod line), "...while former giant Sony (maker of the [portable] Walkman and [CD] Discman [was] struggling." This market change was initiated in 1998, when the first portable digital audio player, the Rio personal digital music player, was introduced. Portable MP3 players like the Rio competed with portable CD players. The 64 MB version of the Rio MP3 player enabled users to store about 20 songs on the player. One of the benefits of the Rio over portable CD players was that since the Rio had no moving parts, it offered skip-free playback. Since 1998, the price of portable digital audio players has dropped and the storage capacity has increased significantly. In the 2000s, users can "carry [their] entire music collection in a [digital audio] player the size of a cigarette package." The 4 GB iPod, for example, holds over 1,000 songs.
DVD
There were several formats developed for recording video on optical discs before the DVD. Optical recording technology was invented by David Paul Gregg and James Russell in 1958 and first patented in 1961. A consumer optical disc data format known as LaserDisc was developed in the United States, and first came to market in Atlanta, Georgia in 1978. It used much larger discs than the later formats. Due to the high cost of players and discs, consumer adoption of LaserDisc was very low in both North America and Europe, and was not widely used anywhere outside Japan and the more affluent areas of Southeast Asia, such as Hong-Kong, Singapore, Malaysia and Taiwan.
History of sound recording
The third wave of development in audio recording began in 1945, when the allied nations gained access to a new German invention - magnetic tape recording. The technology was invented in the 1930s, but remained restricted to Germany (where it was widely used in broadcasting) until the end of World War II. Magnetic tape provided another dramatic leap in audio fidelity — indeed, Allied observers first became aware of the existence of the new technology because they noticed that the audio quality of obviously pre-recorded programs was practically indistinguishable from live broadcasts. From 1950 onwards, magnetic tape quickly became the standard medium of audio master recording in the radio and music industries, and led to the development of the first hi-fi stereo recordings for the domestic market, the development of multi-track tape recording for music, and the demise of the disc as the primary mastering medium for sound. Magnetic tape also brought about a radical reshaping of the recording process — it made possible recordings of far longer duration and much higher fidelity than ever before, and it offered recording engineers the same exceptional plasticity that film gave to cinema editors — sounds captured on tape could now easily be manipulated sonically, edited, and combined in ways that were simply impossible with disc recordings. These experiments reached an early peak in the 1950s with the recordings of Les Paul and Mary Ford, who pioneered the use of tape editing and "multi-tracking" to create large 'virtual' ensembles of voices and instruments, constructed entirely from multiple taped recordings of their own voices and instruments. Magnetic tape fueled a rapid and radical expansion in the sophistication of popular music and other genres, allowing composers, producers, engineers and performers to realize previously unattainable levels of complexity. Other concurrent advances in audio technology led to the introduction of a range of new consumer audio formats and devices, on both disc and tape, including the development full-frequency-range disc reproduction, the change from shellac to polyvinyl plastic for disc manufacture, the invention of the 33rpm, 12-inch long-playing (LP) disc and the 45rpm 7-inch "single", the introduction of domestic and professional portable tape recorders (which enabled high-fidelity recordings of live performances), the popular 4-track cartridge and compact cassette formats, and even the world's first "sampling keyboards" - the pioneering tape-based keyboard instrument the Chamberlin, and its more famous successor, the Mellotron.
History of supercomputing
In 1957, a group of engineers left Sperry Corporation to form Control Data Corporation (CDC) in Minneapolis, Minnesota. Seymour Cray left Sperry a year later to join his colleagues at CDC. In 1960, Cray completed the CDC 1604, one of the first solid-state computers, and the fastest computer in the world at a time when vacuum tubes were found in most large computers.
Around 1960, Cray decided to design a computer that would be the fastest in the world by a large margin. After four years of experimentation along with Jim Thornton, and Dean Roush and about 30 other engineers Cray completed the CDC 6600 in 1964. Cray switched from germanium to silicon transistors, built by Fairchild Semiconductor, that used the planar process. These did not have the drawbacks of the mesa silicon transistors. He ran them very fast, and the speed of light restriction forced a very compact design with severe overheating problems, which were solved by introducing refrigeration, designed by Dean Roush. Given that the 6600 outran all computers of the time by about 10 times, it was dubbed a "supercomputer" and defined the supercomputing market when one hundred computers were sold at $8 million each.
History of Wikipedia
The first CD version containing a selection of articles from the English Wikipedia was published in April 2006 by as the "2006 Wikipedia CD Selection". In April 2007, "Wikipedia Version 0.5", a CD containing around 2000 articles selected from the online encyclopedia was published by the Wikimedia Foundation and Linterweb. The selection of articles included was based on both the quality of the online version and the importance of the topic to be included. This CD version was created as a test-case in preparation for a DVD version including far more articles. The CD version can be purchased online, downloaded as a DVD image file or , or accessed online at the project's website.
Video game console
In the mid-1990s, various manufacturers shifted to optical media, specifically CD-ROM, for games. Although they were slower at loading game data than the cartridges available at that time, they were significantly cheaper to manufacture and had a larger capacity than the existing cartridge technology. NEC released the first CD-based gaming system, the TurboGrafx-CD (an add-on for the TurboGrafx-16), in December 4, 1988 in Japan and August 1, 1990 in the United States. Sega followed suit with the Sega CD (an add-on for the Sega Genesis) in Japan on December 12, 1991; Commodore stepped into the ring shortly after with the Amiga-CD32, the first 32-bit game console, on September 17, 1993. During the later half of the 1990s, optical media began to supplant cartridges due to their greater storage capacity and cheaper manufacturing costs, with the CD-based PlayStation significantly outpacing the cartridge-based Nintendo 64 in terms of sales. By the early 21st century, all of the major home consoles used optical media, usually DVD-ROM or similar discs, which are widely replacing CD-ROM for data storage. The PlayStation 3, PlayStation 4, and Xbox One systems use even higher-capacity Blu-ray optical discs for games and movies, while the Xbox 360 formerly used HD DVDs in the form of an external USB player add-on for video playback before it was discontinued. However, Microsoft still supports those who bought the accessory. Nintendo's GameCube, Wii, and Wii U, meanwhile, use proprietary disc formats based on then-current industry standard discs—the GameCube's discs are based on mini-DVDs, the Wii's on DVDs and the Wii U's are believed to be based on Blu-rays. These discs offer somewhat smaller storage capacities compared to the formats they are based on, though the difference is significantly smaller compared to the gap between the N64's cartridges and CDs.
History of science and technology in Japan
In 1984, Sony introduced a LaserDisc format that could store any form of digital data, as a data storage device similar to CD-ROM, with a larger capacity of 3.28 GiB. The DVD format was developed by Sony, Panasonic and Toshiba in 1994. The same year, Sony and Tatung Company released the first DVD player.Flash memory (both NOR and NAND types) was invented by Dr. Fujio Masuoka while working for Toshiba around 1980.Dr. Norikazu Sawazaki invented a prototype video tape recorder in 1953, based on helical scan technology.In Japan, the computer was using digital video disks to display color pictures at 256x256 image resolution in 1972.
Clarinet
Johann Christoph Denner is generally believed to have invented the clarinet in Germany around the year 1700 by adding a register key to the earlier chalumeau. Over time, additional keywork and airtight pads were added to improve the tone and playability.
Kees Schouhamer Immink
After the CD standard was set in 1980, Immink and his co-workers conducted pioneering experiments with magneto-optical audio recording on pre-grooved discs. They also found a simple method to extend the analog videodisc standard with digital sound. The new systems were brought to market as MiniDisc and CD Video. Laserdisc’s fabricated after 1984 have digitally encoded sound signals.
Ice dance
Many of the first CDs were developed during the 1930s by teams from Great Britain, which dominated ice dance internationally throughout the 1950s, during the period before it became an Olympic sport in 1972. Early in ice dance history, the CD contributed 60% of the total score.
Charge-coupled device
The charge-coupled device was invented in 1969 in the United States at AT&T Bell Labs by Willard Boyle and George E. Smith.
The lab was working on semiconductor bubble memory when Boyle and Smith conceived of the design of what they termed, in their notebook, "Charge 'Bubble' Devices".
The device could be used as a shift register. The essence of the design was the ability to transfer charge along the surface of a semiconductor from one storage capacitor to the next. The concept was similar in principle to the bucket-brigade device (BBD), which was developed at Philips Research Labs during the late 1960s. The first patent () on the application of CCDs to imaging was assigned to Michael Tompsett.
Sony Canada
World's first CD player, the CDP-101 is introduced
Optical recording
Standard CDs have a diameter of 120 mm and can hold up to 80 minutes of audio (700 MB of data). The Mini CD has various diameters ranging from 60 to 80 mm; they are sometimes used for CD singles or device drivers, storing up to 24 minutes of audio. The technology was later adapted and expanded to include data storage CD-ROM, write-once audio and data storage CD-R, rewritable media CD-RW, Super Audio CD (SACD), Video Compact Discs (VCD), Super Video Compact Discs (SVCD), PhotoCD, PictureCD, CD-i, and Enhanced CD. CD-ROMs and CD-Rs remain widely used technologies in the computer industry. The CD and its extensions have been extremely successful: in 2004, worldwide sales of CD audio, CD-ROM, and CD-R reached about 30 billion discs. By 2007, 200 billion CDs had been sold worldwide.
David Paul Gregg
In 1968 the Gregg and Gauss patents were purchased by MCA (Music Corporation of America), which helped develop the technology further. His designs and patents paved the way for the Laserdisc, which helped with the creation of the DVD, compact discs, and MiniDisc. In 1963 he also invented a video disk camera which could store several minutes worth of images onto an optical video disk. There was no patent files for the camera and only little is known about it. Dr. Gregg died in Culver City, California in November 2001 at the age of 78.
Cambridge Audio
In 1985 a major innovative step was made with the launch of the CD1, the world's first two-box CD player. At the time this CD player was widely recognised as the best player available and its design featured many new ideas and a ground-breaking specification. Apart from putting the DAC stages into a separate case, the transport was mounted on a lead beam suspension to reduce disc reading errors; a unique audio stage offered the choice of six alternative playback filters; and the digital-to-analogue conversion was performed by six matched DACs to give linearity down to −120 dB at a time when most players were only linear down to about −94 dB.
Sega Genesis
By 1991, compact discs had gained in popularity as a data storage device for music and software. PCs and video game companies had started to make use of this technology. NEC had been the first to include CD technology in a game console with the release of the TurboGrafx-CD add-on, and Nintendo was making plans to develop its own CD peripheral as well. Seeing the opportunity to gain an advantage over its rivals, Sega partnered with JVC to develop a CD-ROM add-on for the Genesis. Sega launched the Mega-CD in Japan on December 1, 1991, initially retailing at JP¥49,800. The CD add-on was launched in North America on October 15, 1992, as the Sega CD, with a retail price of US$299; it was released in Europe as the Mega-CD in 1993. In addition to greatly expanding the potential size of its games, this add-on unit upgraded the graphics and sound capabilities by adding a second, more powerful processor, more system memory, and hardware-based scaling and rotation similar to that found in Sega's arcade games. It provided battery-backed storage RAM to allow games to save high scores, configuration data, and game progress.
Sony CDP-101
The Sony CDP-101 is the world's first commercially released compact disc player. The system was launched in Japan on October 1, 1982 at a list price of 168,000 yen (approx US$730).
Sound recording and reproduction
The next major technical development was the invention of the gramophone record, generally credited to Emile Berliner and patented in 1887, though others had demonstrated similar disk apparatus earlier, most notably Alexander Graham Bell in 1881. Discs were easier to manufacture, transport and store, and they had the additional benefit of being marginally louder than cylinders. Sales of the gramophone record overtook the cylinder ca. 1910, and by the end of World War I the disc had become the dominant commercial recording format. Edison, who was the main producer of cylinders, created the Edison Disc Record in an attempt to regain his market. The double-sided 78 rpm shellac disc was the standard consumer music format from the early 1910s to the late 1950s. In various permutations, the audio disc format became the primary medium for consumer sound recordings until the end of the 20th century.
History of photography
The charge-coupled device (CCD) is the image-capturing optoelectronic component in first-generation digital cameras. It was invented in 1969 by Willard Boyle and George E. Smith at AT&T Bell Labs as a memory device. The lab was working on the Picturephone and on the development of semiconductor bubble memory. Merging these two initiatives, Boyle and Smith conceived of the design of what they termed "Charge 'Bubble' Devices". The essence of the design was the ability to transfer charge along the surface of a semiconductor. It was Dr. Michael Tompsett from Bell Labs however, who discovered that the CCD could be used as an imaging sensor. The CCD has increasingly been replaced by the active pixel sensor (APS), commonly used in cell phone cameras. These mobile phone cameras are used by billions of people worldwide, dramatically increasing photographic activity and material and also fueling citizen journalism.The web has been a popular medium for storing and sharing photos ever since the first photograph was published on the web by Tim Berners-Lee in 1992 (an image of the CERN house band Les Horribles Cernettes). Since then sites and apps such as Facebook, Flickr, Instagram, Picasa (discontinued in 2016), Imgur and Photobucket have been used by many millions of people to share their pictures.
CD player
Philips coined the term "compact disc" in line with another audio product, the Compact Cassette, and contributed the general manufacturing process, based on video LaserDisc technology. Philips also contributed eight-to-fourteen modulation (EFM), which offers a certain resilience to defects such as scratches and fingerprints, while Sony contributed the error-correction method, CIRC. The "Compact Disc Story", told by a former member of the task force, gives background information on the many technical decisions made, including the choice of the sampling frequency, playing time, and disc diameter. The task force consisted of around four to eight persons, though according to Philips, the Compact Disc was "invented collectively by a large group of people working as a team."
Capacitance Electronic Disc
RCA began videodisc research in 1964, in an attempt to produce a phonograph-like method of reproducing video. Research and development was slow in the early years, as the development team originally comprised only four men, but by 1972, the CED team at RCA had produced a disc capable of holding ten minutes of color video (a portion of the "Get Smart" episode "A Tale of Two Tails", re-titled "Lum Fong").
Compact Disc Digital Audio
The creators of the CD originally aimed at a playing time of 60 minutes with a disc diameter of 100 mm (Sony) or 115 mm (Philips). Sony vice-president Norio Ohga suggested extending the capacity to 74 minutes to accommodate the recording of Wilhelm Furtwängler conducting Ludwig van Beethoven's Ninth Symphony at the 1951 Bayreuth Festival. The additional 14-minute playing time subsequently required changing to a 120 mm disc. Kees Schouhamer Immink, Philips' chief engineer, however, denies this, claiming that the increase was motivated by technical considerations, and that even after the increase in size, the Furtwängler recording would not have fit on one of the earliest CDs.
Active pixel sensor
Image sensor elements with in-pixel amplifiers were described by Noble in 1968, by Chamberlain in 1969, and by Weimer "et al." in 1969, at a time when "passive-pixel sensors" – that is, pixel sensors without their own amplifiers or active noise cancelling circuitry – were being investigated as a solid-state alternative to vacuum-tube imaging devices. The MOS passive-pixel sensor used just a simple switch in the pixel to read out the photodiode integrated charge. Pixels were arrayed in a two-dimensional structure, with an access enable wire shared by pixels in the same row, and output wire shared by column. At the end of each column was an amplifier. Passive-pixel sensors suffered from many limitations, such as high noise, slow readout, and lack of scalability. The addition of an amplifier to each pixel addressed these problems, and resulted in the creation of the active-pixel sensor. Noble in 1968 and Chamberlain in 1969 created sensor arrays with active MOS readout amplifiers per pixel, in essentially the modern three-transistor configuration. The CCD was invented in October 1969 at Bell Labs. Because the MOS process was so variable and MOS transistors had characteristics that changed over time (Vth instability), the CCD's charge-domain operation was more manufacturable and quickly eclipsed MOS passive and active pixel sensors. A low-resolution "mostly digital" N-channel MOSFET imager with intra-pixel amplification, for an optical mouse application, was demonstrated in 1981.
History of Sega
By 1991, compact discs had gained in popularity as a data storage device for music and software. PCs and video game companies had started to make use of this technology. NEC had been the first to include CD technology in a game console with the release of the TurboGrafx-CD add-on, and Nintendo was making plans to develop its own CD peripheral as well. Seeing the opportunity to gain an advantage over its rivals, Sega partnered with JVC to develop a CD-ROM add-on for the Genesis. Sega launched the Mega-CD in Japan on December 1, 1991, initially retailing at JP¥49,800. The CD add-on was launched in North America on October 15, 1992, as the Sega CD, with a retail price of US$299; it was released in Europe as the Mega-CD in 1993. In addition to greatly expanding the potential size of its games, this add-on unit upgraded the graphics and sound capabilities by adding a second, more powerful processor, more system memory, and hardware-based scaling and rotation similar to that found in Sega's arcade games. The Mega-CD sold only 100,000 units during its first year in Japan, falling well below expectations. Although many consumers blamed the add-on's high launch price, it also suffered from a small software library; only two games were available at launch. This was due in part to the long delay before Sega made its software development kit available to third-party developers. Sales were more successful in North America and Europe, although the novelty of full motion video (FMV) and CD-enhanced games quickly wore off as many of the Sega CD's later games were met with lukewarm or negative reviews.
Crystal detector
Invented in 1906 by Henry H. C. Dunwoody, this consisted of a piece of silicon carbide (SiC, then known by the trade name "carborundum"), either clamped between two flat metal contacts, or mounted in fusible alloy in a metal cup with a contact consisting of a hardened steel point pressed firmly against it with a spring. Carborundum, an artificial product of electric furnaces produced in 1893, required a heavier pressure than the cat whisker contact. The carborundum detector was popular because its sturdy contact did not require readjustment each time it was used, like the delicate cat whisker devices. Some carborundum detectors were adjusted at the factory and then sealed and did not require adjustment by the user. It was not sensitive to vibration and so was used in shipboard wireless stations where the ship was rocked by waves, and military stations where vibration from gunfire could be expected. Another advantage was that it was tolerant of high currents, and could not be "burned out" by atmospheric electricity from the antenna. Therefore, it was the most common type used in commercial radiotelegraphy stations.
CD player
The Compact Disc is an evolution of LaserDisc technology, where a focused laser beam
is used that enables the high information density required for high-quality digital audio signals.
Prototypes were developed by Philips and Sony independently in the late 1970s. In 1979, Sony and Philips set up a joint task force of engineers to design a new digital audio disc. After a year of experimentation and discussion, the "Red Book" CD-DA standard was published in 1980. After their commercial release in 1982, compact discs and their players were extremely popular. Despite costing up to $1,000, over 400,000 CD players were sold in the United States between 1983 and 1984. The success of the compact disc has been credited to the cooperation between Philips and Sony, who came together to agree upon and develop compatible hardware. The unified design of the compact disc allowed consumers to purchase any disc or player from any company, and allowed the CD to dominate the at-home music market unchallenged.
Willard Boyle
In 1969, Boyle and George E. Smith invented the charge-coupled device (CCD), for which they have jointly received the Franklin Institute's Stuart Ballantine Medal in 1973, the 1974 IEEE Morris N. Liebmann Memorial Award, the 2006 Charles Stark Draper Prize, and the 2009 Nobel Prize in Physics. However, Eugene Gordon and Mike Tompsett, two now-retired colleagues from Bell labs, claim that its application to photography was not invented by Boyle. The CCD allowed NASA to send clear pictures to Earth back from space. It is also the technology that powers many digital cameras today. Smith said of their invention: "After making the first couple of imaging devices, we knew for certain that chemistry photography was dead."
CD Video
CD Video (also known as CDV, CD-V, or CD+V) is a format of optical media disc that was introduced in 1987 that combines the technologies of standard compact disc and LaserDisc. CD-V discs are the same size as a standard 12-cm audio CD, and contain up to 20 minutes' worth of CD Audio that can be played on any audio CD player. It also contains up to 5 minutes of LaserDisc video information with digital CD-quality sound, which can be played back on a newer LaserDisc player capable of playing CD-V discs. One of the first LaserDisc players that can play CD-V discs is the Pioneer CLD-1010 from 1987. Though it is a CD-based format, CD Video was never given a rainbow book designation; the idea of encoding analogue video, which is incompatible between different regions, was poorly received by CD stakeholders other than Philips, who had not consulted them prior to demonstrating the format to the music industry.
Mini CD
Most CD players in the late 1980s and early 1990s didn't handle the Mini CD circular indentation and required the use of an adapter, or very careful placement of the CD in the exact middle of the tray. Not until after the major record labels discontinued them, did the CD Players start to have the 80 mm circular indentation as standard.
Discman
The Discman was Sony's first portable CD player, the D-5 (North America and various other countries)/D-50, which was the first on the market in 1984, and adopted for Sony's entire portable compact disc player line. The name was changed to CD Walkman worldwide in 2000 along with a redesigned "Walkman".
Album
The Compact Cassette was a popular medium for distributing pre-recorded music in the late 1970s through to the 1990s. The very first "Compact Cassette" was introduced by Philips in August 1963 in the form of a prototype. Compact Cassettes became especially popular during the 1980s after the advent of the Sony Walkman, which allowed the person to control what they listened to. The Walkman was convenient because of its size, the device could fit in most pockets and often came equipped with a clip for belts or pants. Compact cassettes also saw the creation of mixtapes, which are tapes containing a compilation of songs created by any average listener of music. The songs on a mixtape generally relate to one another in some way, whether it be a conceptual theme or an overall sound. The compact cassette used double-sided magnetic tape to distribute music for commercial sale. The music is recorded on both the "A" and "B" side of the tape, with cassette being "turned" to play the other side of the album. Compact Cassettes were also a popular way for musicians to record "Demos" or "Demo Tapes" of their music to distribute to various record labels, in the hopes of acquiring a recording contract. The sales of Compact Cassettes eventually began to decline in the 1990s, after the release and distribution Compact Discs. After the introduction of Compact discs, the term "Mixtape" began to apply to any personal compilation of songs on any given format. Recently there has been a revival of Compact Cassettes by independent record labels and DIY musicians who prefer the format because of its difficulty to share over the internet.
Edison Disc Record
The record industry began in 1889 with some very-small-scale production of professionally recorded wax cylinder records. At first, costly wet-cell-powered, electric-motor-driven machines were needed to play them, and the customer base consisted solely of entrepreneurs with money-making nickel-in-the-slot phonographs in arcades, taverns and other public places. Soon, some affluent individuals who could afford expensive toys were customers, too. By the late 1890s, relatively inexpensive spring-motor-driven phonographs were available and becoming a fixture in middle-class homes. The record industry boomed. At the same time, the Berliner Gramophone Company was marketing the first crude disc records, which were simpler and cheaper to manufacture, less bulky to store, much less fragile, and could play louder than contemporary wax cylinders, although they were of markedly inferior sound quality. Their quality was soon greatly improved, and by about 1910 the cylinder was clearly losing this early format war. In 1912, Thomas Edison, who had previously made only cylinders, entered the disc market with his Diamond Disc Phonograph system, which was incompatible with other makers' disc records and players.
VHS
The Video CD (VCD) was created in 1993, becoming an alternative medium for video, in a CD-sized disc. Though occasionally showing compression artifacts and color banding that are common discrepancies in digital media, the durability and longevity of a VCD depends on the production quality of the disc, and its handling. The data stored digitally on a VCD theoretically does not degrade (in the analog sense like tape). In the disc player, there is no physical contact made with either the data or label sides. When handled properly, a VCD will last a long time.
Cambridge Audio
The CD1 soon became a three-box player with the arrival of a Quality Assurance Module, which monitored all the errors on the disc and quantified those that could not be corrected. This proved popular with many audiophile enthusiasts and also with specialist record companies around the world. The player used Philips' digitally filtered 14-bit 4x DACs, but with a difference: three DACs were used per channel, two in parallel and one for ranging, rounding the result up to 16 bits overall. While the CD1 remained an audiophile player, there was also demand from both customers and distributors for a more affordable model, which arrived in 1986 with the launch of the CD2. At the time many of the best CD players still used a 14-bit, 4 times oversampling conversion technique, so the Cambridge Audio team set out to achieve a step change in performance by offering for the first time a model with 16-bit 16 times oversampling: a massive improvement in the resolution of the fine detail on the disc. Magazine reviews were outstanding and the company found itself in the enviable position of being back-ordered by six months even before the first unit was delivered.
Video CD
The VCD format was very popular throughout Asia
(except Japan and South Korea) in the late 1990s through the 2000s, with 8 million VCD players sold in China in 1997 alone,
and more than half of all Chinese households owning at least one VCD player by 2005. A big reason for the popularity is that Chinese engineer Wanmeng Jiang, founder of Wanyan Inc., developed the first VCD player. However, popularity has declined over the years, as the number of Hong Kong factories that produced VCDs dropped from 98 in 1999 to 26 in 2012.
List of Dutch inventions and innovations
Laserdisc technology, using a transparent disc, was invented by David Paul Gregg in 1958 (and patented in 1961 and 1990). By 1969, Philips developed a videodisc in reflective mode, which has great advantages over the transparent mode. MCA and Philips decided to join forces. They first publicly demonstrated the videodisc in 1972. Laserdisc entered the market in Atlanta, on 15 December 1978, two years after the VHS VCR and four years before the CD, which is based on Laserdisc technology. Philips produced the players and MCA made the discs.
Pin insulator
Pin insulators have become collectible items. All glass pin insulators are assigned a Consolidated Design (CD) number, a system first implemented by hobbyist N.R. Woodward in 1954. Each CD number corresponds to a specific glass style, shape or manufacturer. Also, CD numbers are only hobby-specific for collectors, and are not used or recognised by insulator manufacturers.
Video CD
Philips later teamed up with Sony to develop a new type of disc, the compact disc or CD. Introduced in 1982 in Japan (1983 in the U.S. and Europe), the CD is about in diameter, and is single-sided. The format was initially designed to store digitized sound and proved to be a success in the music industry.
Compatible Discrete 4
Compatible Discrete 4, also known as Quadradisc or CD-4 (not to be confused with compact disc) was as a discrete four-channel quadraphonic system for phonograph records. The system was created by JVC and RCA in 1971 and introduced in May 1972.
Music technology (electric)
The long-playing 33 rpm microgroove vinyl record, or "LP", was developed at Columbia Records and introduced in 1948. The short-playing but convenient 7-inch 45 rpm microgroove vinyl single was introduced by RCA Victor in 1949. In the US and most developed countries, the two new vinyl formats completely replaced 78 rpm shellac discs by the end of the 1950s, but in some corners of the world the "78" lingered on far into the 1960s. Vinyl was much more expensive than shellac, one of several factors that made its use for 78 rpm records very unusual, but with a long-playing disc the added cost was acceptable and the compact "45" format required very little material. Vinyl offered improved performance, both in stamping and in playback. If played with a good diamond stylus mounted in a lightweight pickup on a well-adjusted tonearm, it was long-lasting. If protected from dust, scuffs and scratches there was very little noise. Vinyl records were, over-optimistically, advertised as "unbreakable". They were not, but they were much less fragile than shellac, which had itself once been touted as "unbreakable" compared to wax cylinders.
Mass communication
Recordings, developed in the 1870s, became the first non-print form of mass communication.  The invention of the phonograph by Thomas Edison in the late 19th century, the graphophone by Alexander Graham Bell and Charles Tainter, and the gramophone by The Victor Talking Machine Company were the first competing mass media forms that brought recorded music to the masses. Recording changed again in the 1950’s with the invention of the LP (long play) vinyl record, then eight track-tapes, followed by vinyl, and cassettes in 1965. Compact discs (CDs) followed and were seen as the biggest invention in recorded arts since Edison.
CD single
A CD single (sometimes abbreviated to CDS) is a music single in the form of a compact disc. The standard in the Red Book for the term "CD single" is an 8cm (3 inch) CD (or Mini CD). It now refers to any single recorded onto a CD of any size, particularly the CD5, or 5-inch CD single. The format was introduced in the mid-1980s but did not gain its place in the market until the early 1990s. With the rise in digital downloads in the early 2010s, sales of CD singles have decreased.
De Wolfe Music
Digital technology bought changes to the music industry in the 1980's, particularly with the evolution of CDs. In 1985 de Wolfe launched its DWCD collection of 6 CDs, becoming the world's first digital production music library. De Wolfe ultimately ended the production of its vinyl series in 1988, and the end of the production of CDs would come in 2014 as de Wolfe shifted focus to online delivery.
Cluster of differentiation
The CD nomenclature was proposed and established in the 1st International Workshop and Conference on Human Leukocyte Differentiation Antigens (HLDA), which was held in Paris in 1982. This system was intended for the classification of the many monoclonal antibodies (mAbs) generated by different laboratories around the world against epitopes on the surface molecules of leukocytes (white blood cells). Since then, its use has expanded to many other cell types, and more than 370 CD unique clusters and subclusters have been identified. The proposed surface molecule is assigned a CD number once two specific monoclonal antibodies (mAb) are shown to bind to the molecule. If the molecule has not been well characterized, or has only one mAb, it is usually given the provisional indicator "w" (as in "CDw186").
CD player
In 1983 Philips, at the US and European launch of the CD format, showcased the first top loading CD tray designs with their CD100 CD player. (Philips audio products were sold as Magnavox in the US at the time.) The design had a clamp on the lid which meant the user had to close this over the CD when it was placed inside the machine. Later, Meridian introduced their MCD "high end" CD player, with Meridian electronics in the Philips CD100 chassis.
Do You Want To
CD
Music centre
The compact disc appeared in the early 1980s and the integrated hi-fi system came into its own, because the small size of a CD player compared to a turntable meant that this function could be reintegrated into the main unit without compromising its small size.
SPARS code
These albums with common SPARS codes (AAD, ADD, DDD) are arranged by year of release on CD, where known:
Many older recordings previously issued on vinyl were reissued on CD, beginning with the format's commercial introduction in late 1982 (see Digital recording for a timeline). Reissue CDs often only have the original LP's copyright dates on them, so it's not obvious when the CDs were actually made. If they bear a SPARS code, though, the manufacture date was no earlier than 1984. Most of these older recordings were analog, so it's not unusual to see AAD and ADD codes, but occasional examples of digital-recording codes appear on later CD editions, such as these:
AppleCD
AppleCD is a range of SCSI-based CD-ROM drives for Apple Macintosh personal computers, manufactured and sold by Apple Computer from the late 1980s to late 1990s. Earlier AppleCD drives required a CD caddy in order to be used, while later models used a tray-loading mechanism. The original model introduced in 1988 was simply called the AppleCD SC. There was also a version of the CD drive that did not have the Apple logo.
Wire recording
In 1949 at Fuld Hall in Rutgers University, Paul Braverman made a 75-minute recording of a Woody Guthrie concert using a wire recorder. The recording only came to light in 2001, and appears to be the only surviving live recording of Woody Guthrie; it was restored over several years and released on CD in 2007. The CD, "", subsequently won the 2008 Grammy Award for Best Historical Album.
One of the world's first stored-program computers, SEAC, built in 1950 at the U.S. National Bureau of Standards, used wire recorders to store digital data.
Timeline of United States inventions (1946–1991)
A charge-coupled device (CCD) is a device for the movement of electrical charge, usually from within the device to an area where the charge can be manipulated. This is achieved by "shifting" the signals between stages within the device one at a time. CCDs move charge between capacitive bins in the device, with the shift allowing for the transfer of charge between bins. Often the device is integrated with an image sensor, such as a photoelectric device to produce the charge that is being read, thus making the CCD a major technology for digital imaging. First conceived in its usefulness for computer memory, the charge coupled device was co-invented in 1969 by American physicist George E. Smith and Canadian physicist Willard Boyle at AT&T Bell Laboratories.
PS Audio
In the early 1980s and with the advent of the Compact Disc, PS was one of the first American high-end audio manufacturers to modify one of the few CD players of the day by replacing its internal audio amplification stage following the internal D to A player. The first and only modified CD player introduced by the company was the CD-1 based on the Philips Magnavox line of CD players. The company engineers chose the Magnavox unit because the belief at the time was it sounded better to its only rival in the marketplace, the Sony. Inside the CD 1 PS engineers added a discrete high voltage line stage and power supply, replacing the NE 5532 op amps used as the output amplification stage of the Magnavox. This unit was a stopgap product designed to get the company "in the game" of this new format that would someday challenge vinyl, the company's core products addressed. In the background, PS engineers were working to figure out a way to utilize the CD player's digital output and create a standalone D to A converter. In late 1982, the company succeeded in releasing the first high-end standalone D to A converter known as the Digital Link. Other manufacturers such as Arcam and Theta were also on the same path and both companies released competing D to A processors within several months of the Digital Link's introduction. From this point onwards, the company has produced a succession of DACs with the same goal in mind - that of supplanting the built in DAC and line stage of CD players. Later advances in CD technology led the high-end audio industry to release a new category of product called a CD Transport that contained no DAC and meant to use as a pair which became known as a DAC and Transport combination.
Computer mouse
The trackball, a related pointing device, was invented in 1946 by Ralph Benjamin as part of a post-World War II-era fire-control radar plotting system called Comprehensive Display System (CDS). Benjamin was then working for the British Royal Navy Scientific Service. Benjamin's project used analog computers to calculate the future position of target aircraft based on several initial input points provided by a user with a joystick. Benjamin felt that a more elegant input device was needed and invented what they called a "roller ball" for this purpose.
CD player
Sony executive Norio Ohga, later CEO and chairman of Sony, and Heitaro Nakajima were convinced of the format's commercial potential and pushed further development despite widespread skepticism. As a result, in 1979, Sony and Philips set up a joint task force of engineers to design a new digital audio disc. Led by engineers Kees Schouhamer Immink and Toshitada Doi, the research pushed forward laser and optical disc technology. After a year of experimentation and discussion, the task force produced the "Red Book" CD-DA standard. First published in 1980, the standard was formally adopted by the IEC as an international standard in 1987, with various amendments becoming part of the standard in 1996.
Declare Independence
CD
CD player
Heitaro Nakajima, who developed an early digital audio recorder within Japan's national public broadcasting organization NHK in 1970, became general manager of Sony's audio department in 1971. His team developed a digital PCM adaptor audio tape recorder using a Betamax video recorder in 1973. After this, in 1974 the leap to storing digital audio on an optical disc was easily made. Sony first publicly demonstrated an optical digital audio disc in September 1976. A year later, in September 1977, Sony showed the press a 30 cm disc that could play 60 minutes of digital audio (44,100 Hz sampling rate and 16-bit resolution) using MFM modulation. In September 1978, the company demonstrated an optical digital audio disc with a 150-minute playing time, 44,056 Hz sampling rate, 16-bit linear resolution, and cross-interleaved error correction code—specifications similar to those later settled upon for the standard Compact Disc format in 1980. Technical details of Sony's digital audio disc were presented during the 62nd AES Convention, held on 13–16 March 1979, in Brussels. Sony's AES technical paper was published on 1 March 1979. A week later, on 8 March, Philips publicly demonstrated a prototype of an optical digital audio disc at a press conference called "Philips Introduce Compact Disc" in Eindhoven, Netherlands.
CDDB
CDDB was invented by Ti Kan around late 1993 as a local database that was delivered with his popular xmcd music player application. The application's change history first mentions the acronym CDDB in version 1.1 released on February 25, 1994. Users would submit new entries to the database via e-mail to Kan.