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The Compact Disc (CD), which is based on MCA/Philips Laserdisc technology, was developed by a taskforce of Sony and Philips in 1979–1980. Toshi Doi and Kees Schouhamer Immink created the digital technologies that turned the analog Laserdisc into a high-density low-cost digital audio disc. [14]
Unlike DVDs, which carry Dolby Digital audio in digital form, LaserDiscs stored Dolby Digital in a frequency modulated form within a track normally used for analog audio. Extracting Dolby Digital from a LaserDisc required a player equipped with a special "AC-3 RF" output and an external demodulator in addition to an AC-3 decoder.
Videodisc (or video disc) is a general term for a laser- or stylus-readable random-access disc that contains both audio and analog video signals recorded in an analog form. Typically, it is a reference to any such media that predates the mainstream popularity of the DVD format.
A LaserDisc player is a device designed to play video and audio (analog or digital) stored on LaserDisc. LaserDisc was the first optical disc format marketed to consumers; it was introduced by MCA DiscoVision in 1978. From 1978 until 1984, all LaserDisc player models read discs by using a helium–neon laser.
The LaserDisc format stored analog video signals for the distribution of home video, but commercially lost to the VHS videocassette format, due mainly to its high cost and non-re-recordability; other first-generation disc formats were designed only to store digital data and were not initially capable of use as a digital video medium.
Although the term “digicam” originated as a syllabic abbreviation for “digital camera”, it is now used primarily to refer to an old compact digital camera or, in other words, a discontinued point-and-shoot camera with a fixed lens. [32] [33] [34] Digicams emphasize portability and ease of use, and they often include a built-in flash. [35]
The LaserDisc play quality is average but is superior to the other mid range and low end models produced in the early '90s. Noise level is low and image is sharp and stable. DVD play quality is however not even catching up to the cheaper DVD players that can be bought at discount stores today.
The LaserDisc provided picture quality nearly double that of VHS tape and analog audio quality far superior to cheap mono VHS recorders (although the difference to the more expensive VHS HiFi stereo recorders was minuscule). Philips later teamed up with Sony to develop a new type of disc, the compact disc or CD.
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