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videodisc

videodisc or videodisk, disk used with a special player and television to reproduce both pictures and sound. A videodisc player cannot record television programs off the air for later playback, unlike a videocassette recorder (VCR) or recordable DVD (see digital versatile disc). Videodiscs generally produce pictures that are clearer in detail and truer in color than those produced by VCR tapes, and they also offer better sound quality, but the introduction of the DVD led to their becoming obsolete. Two quite different videodisc systems were developed. One operates much like a record player, using a mechanical stylus that senses varying patterns of electrical capacitance imprinted in grooves on the disc surface. That format fell into disuse, becoming superseded by the laser disc system, which uses a laser to read a track cut in a spiral pattern on the inside surface of the disc. On a laser disc, video is recorded as an analog signal and the soundtrack is either an analog or, in later versions, a digital signal.

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"videodisc." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

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"videodisc." The Columbia Encyclopedia, 6th ed.. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/videodisc

video disc

video disc Vinyl disc coated with a reflective, metallic surfacing. On one side of the reflective surface is etched a spiral of microscopic pits corresponding to digital information that can be picked up by a laser scanner and converted electronically to video pictures and sound. Since the late 1980s, video discs have been almost entirely superseded by the smaller, more comprehensive type of compact disc (CD) called a CD-ROM.

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"video disc." World Encyclopedia. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"video disc." World Encyclopedia. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/video-disc

"video disc." World Encyclopedia. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/video-disc

videodisk

videodisk A form of read-only optical disk, devised for recording TV programs but also used for education and training. A write-once version is also available. Videodisks have been used for recording data, particularly when it is in image form, for computer systems; CD-ROM or DVD is now preferred for most such applications.

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"videodisk." A Dictionary of Computing. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"videodisk." A Dictionary of Computing. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/videodisk

"videodisk." A Dictionary of Computing. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/videodisk

videodisc

vid·e·o·disc / ˈvidēōˌdisk/ (also vid·e·o·disk) • n. a CD-ROM or other disk used to store visual images and sound.

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"videodisc." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"videodisc." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/videodisc

"videodisc." The Oxford Pocket Dictionary of Current English. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/videodisc