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| CD | |
|---|---|
| Name | Compact Disc |
| Caption | A compact disc reflecting light |
| Introduced | 1982 |
| Developer | Sony and Philips |
| Capacity | 650–700 MB, 74–80 minutes (audio) |
| Use | Audio, data storage, video |
CD
The compact disc is an optical disc format developed in the early 1980s for digital audio and later adapted for data storage, video playback, and archival uses. Conceived through collaboration between Sony and Philips, the format became a foundational medium in consumer electronics, influencing devices by Panasonic, Toshiba, Hitachi, Sharp and shaping markets in Japan, United States, United Kingdom, and Germany. Driven by standards bodies such as the IEC and corporations such as Matsushita Electric (Panasonic), the compact disc catalyzed shifts in production, distribution, and copyright practices involving organizations like IFPI and RIAA.
The compact disc emerged as a consumer-ready optical storage medium enabling high-fidelity digital audio and subsequent data formats. Early demonstrations and market launches involved Sony and Philips executives, with product rollouts coordinated across major electronics manufacturers including Yamaha and Kenwood. The format dovetailed with digital audio technologies developed at institutions such as Bell Labs and standards promulgated by IEC committees. Its uptake altered industries dominated by companies like EMI and Warner Music Group and impacted retail chains such as Tower Records and HMV.
Development began from research on optical audio and laser playback technologies pursued by corporations and research labs including Philips Research and Sony. Negotiations between Phillips and Sony in the late 1970s led to a joint specification, addressing work by engineers from Matsushita Electric (Panasonic) and researchers previously associated with Telefunken. The formal announcement in 1982 followed demonstrations at trade shows like Consumer Electronics Show and releases by manufacturers such as Denon and Pioneer. The initial market focused on recordings by labels including EMI and Columbia Records and saw early adoption among listeners who purchased hardware from Sharp and JVC. Standardization efforts by IEC and licensing by Sony and Philips ensured interoperability and encouraged the rise of compatible drives in IBM PC-compatible computers and consumer players from Kenwood.
The optical medium spawned multiple disc families standardized by organizations such as ISO. Audio-focused variants include the original Red Book audio format defined by Philips and Sony. Data-oriented derivatives standardized later include the Yellow Book CD-ROM used by software publishers like Microsoft and Sierra Entertainment; the Orange Book for writable formats such as CD-R and CD-RW produced by manufacturers like Verbatim and Taiyo Yuden; the White Book for video-related Video CD popular in markets including China and Hong Kong; and extensions like Enhanced CD combining audio and data tracks from labels like Warner Music Group. Specialized discs such as Photo CD from Kodak catered to photography workflows, while archival proposals influenced optical media standards developed by entities such as ISO and IEC.
Production processes involve mastering, stamper creation, injection molding, metallization, and protective lacquer application, executed in factories run by companies like Mitsui and Ritek. Substrate materials primarily include polycarbonate resins supplied by chemical firms such as BASF and Covestro. Reflective layers commonly use aluminum or gold applied via sputtering techniques developed in collaboration with equipment makers like Applied Materials. Quality control and anti-scratch coatings involve suppliers and research from organizations like DuPont and 3M. Pressing plants historically located in regions including Japan, Taiwan, South Korea, and Germany handled mass replication for record labels and software publishers.
Originally intended for consumer audio distribution by labels such as Sony Music and Universal Music Group, compact discs became repositories for computer software from publishers like Adobe Systems and Electronic Arts (EA). The format supported distribution of multimedia encyclopedias and educational titles by firms like Encarta and Broderbund. In professional contexts, audio mastering houses and studios associated with companies like Abbey Road Studios and Capitol Studios used the medium for reference masters. Video CD found popularity for cinema distribution and home video in regions where DVD adoption lagged, affecting markets overseen by distributors like Golden Harvest. Scientific and archival communities used CD-ROM and disc images in projects by institutions such as NASA and Library of Congress for dataset dissemination and long-term preservation experiments.
Key specifications are codified across standards bodies including IEC and ISO. The Red Book defines 16-bit linear PCM at 44.1 kHz sampling for audio, while Yellow Book details sector structures and error-correction schemes like CIRC and EFM encoding implemented by chipmakers such as Texas Instruments and Philips. Physical dimensions (120 mm diameter, 1.2 mm thickness) align with tooling developed by industry consortia including Sony. Writable media standards (e.g., Orange Book Part II/III) specify dye chemistry, write strategies, and defect management employed by recorder hardware from Pioneer and Plextor. Compliance and logo licensing involve bodies like IFPI and testing laboratories including Intertek.
Environmental concerns include material sourcing from chemical companies like BASF and the lifecycle implications assessed by agencies such as the Environmental Protection Agency and European Environment Agency. Polycarbonate substrates and metal layers complicate recycling streams managed in regions by firms like Sims Recycling Solutions and national programs in Japan and Germany. Discarded discs contribute to plastic waste and are sometimes processed through mechanical recycling or energy recovery at facilities operated by companies such as Veolia. Preservation programs at institutions like Library of Congress and initiatives by UNESCO examine long-term storage versus digital migration to mitigate obsolescence and environmental impact.
Category:Optical disc media