In the decade since 1970 (corresponding to 2513 to 2522), researchers of Philips. The technology of laser discs and disc. The experimental optical disc for storing audio only. Initially used to encode audio and wideband FM in digital PCM form at a later time. The late, Philips, Sony and other companies displayed prototypes of digital audio discs in 2522, Philips and Sony decided to cooperate. Established a joint engineering team With the mission to design the new digital audio disc. A key member of the team is Toshitada Doi Kees Immink and after trial and argued a year. The team has issued Red Book standard. This is a standard compact disc At Philips supports the manufacturing process. Based on the technology of producing laser disc. Philips also supports EFM modulation method, which can save a lot of noise. And resistance to abrasion Or fingerprints While Sony's support to solve code errors (error correction) CIRC in Compact Disc Story telling by one member of the team. Provide information about the source of many technical decisions. Including the choice of sampling frequency. Time to play And diameter discs Phillips described the compact disc "was invented jointly by a group of people working together as a team" ("invented collectively by a large group of people working as a team.") The CD was produced in the industry. The world first on August 17, 2525 By the time it was produced a CD for the music (Audio CD) later in the year, 2528 was a CD for storage (CD-ROM) followed, and the CD-flipping method. the life of the world may happen in the next few years after the maturity of the CD-ROM That was in 2533 a CD-R or CD that can write data to it by writing it happen. This is the work of two great companies is invented Sony (Sony) and Phillip sites (Phillips).
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