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Compact disc is a digital optical disc data storage format, co-developed by and and released in 1982. Samsung mobile pc suite download. The format was developed to store and play only sound recordings but was adapted for storage of data. Several other formats were further derived from these, including audio and data storage, rewritable media, Video, Super Video Compact Disc, PictureCD,; the first commercially available audio CD player, the, was released October 1982 in. Standard CDs have a diameter of 120 millimetres and can hold up to about 80 minutes of uncompressed audio or about 700 MiB of data; the has various diameters ranging from 60 to 80 millimetres.
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 hold 10 MB. By 2010, hard drives 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. From the early 2000s CDs were being replaced by other forms of digital storage and distribution, with the result that by 2010 the number of audio CDs being sold in the U. Had dropped about 50% from their peak. In 2014, revenues from digital music services matched those from physical format sales for the first time. American inventor has been credited with inventing the first system to record digital information on an optical transparent foil, lit from behind by a high-power lamp.
Russell's patent application was filed in 1966, he was granted a patent in 1970. Following litigation and Philips licensed Russell's patents in the 1980s; the compact disc is an evolution of 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 Sony independently in the late 1970s.
Although dismissed by management as a trivial pursuit, the CD became the primary focus for Philips as the LaserDisc format struggled.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 CD-DA standard was published in 1980. After their commercial release in 1982, compact discs and their players were popular. Despite costing up to $1,000, over 400,000 CD players were sold in the between 1983 and 1984. By 1988, CD sales in the United States surpassed those of LPs, by 1992 CD sales surpassed those of prerecorded music tapes; the success of the compact disc has been credited to the cooperation between Philips and Sony, which together agreed upon and developed compatible hardware. The unified design of the compact disc allowed consumers to purchase any disc or player from any company, allowed the CD to dominate the at-home music market unchallenged.
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In 1974, Lou, director of the audio division of Philips, started a small group with the aim to develop an analog optical audio disc with a diameter of 20 cm and a sound quality superior to that of the vinyl record.However, due to the unsatisfactory performance of the analog format, two Philips research engineers recommended a digital format in March 1974. In 1977, Philips established a laboratory with the mission of creating a digital audio disc; the diameter of Philips's prototype compact disc was set at 11.5 cm, the diagonal of an audio cassette., who developed an early digital audio 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 video recorder in 1973. After this, in 1974 the leap to storing digital audio on an optical disc was made. First publicly demonstrated an optical digital audio disc in September 1976. A year in September 1977, Sony showed the press a 30 cm disc that could play 60 minutes of digital audio 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, linear resolution, error correction code—specifications similar to those settled upon for the standard compact disc format in 1980.Technical details of Sony's digital audio disc were presented during the 62nd, held on 13–16 March 1979, in. Sony's AES technical paper was published on 1 March 1979.
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A week on 8 March, publicly demonstrated a prototype of an optical digital audio disc at a press conference called 'Philips Introduce ' in. Sony executive CEO and chairman of Sony, 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.
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Led by engineers and, 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 stand.