videodisc


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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 recordervideocassette recorder
(VCR), device that can record television programs or the images from a video camera on magnetic tape (see tape recorder); it can also play prerecorded tapes.
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 (VCR) or recordable DVD (see digital versatile discdigital versatile disc
or digital video disc
(DVD), a small plastic disc used for the storage of digital data. The successor media to the compact disc (CD), a DVD can have more than 100 times the storage capacity of a CD.
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). 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 playerrecord player
or phonograph,
device for reproducing sound that has been recorded as a spiral, undulating groove on a disk. This disk is known as a phonograph record, or simply a record (see sound recording).
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, 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 That format fell into disuse, becoming superseded by the laser disc system, which uses a laserlaser
[acronym for light amplification by stimulated emission of radiation], device for the creation, amplification, and transmission of a narrow, intense beam of coherent light. The laser is sometimes referred to as an optical maser.
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 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.

videodisc

(1) An early optical disc used for full-motion video. See LaserDisc, CED and Video CD.

(2) An optical disc that contains video material. Today's video formats are DVD and Blu-Ray. See DVD and Blu-ray.
References in periodicals archive ?
Videodiscs stored analogue video signals and were controlled by programs executed on a computer to which the videodisc was attached.
remedial math, general math) and randomly assigned to either the basal program or videodisc instruction.
Further, the more we administered the TCB, the more we became interested in adapting the TCB to videodisc to capitalize on that medium's administration strengths and to build a foundation for future computer applications with the measure.
The videodisc photolog system is a key tool that allows users to have automatic computer access to all video images of the state-maintained roadway network.
Once teachers and students open the program, the instructions clearly explain how to use the videodisc and how to interact with the software.
The approach is called interactive videodisc (IVD).
Waterford built the first educational videodisc in history for McGraw Hill as well as the first educational videodisc for the National Science Foundation.
Also, Guy and Frisby (1992) found that the performance of pre-nursing and allied-health college students in a gross anatomy course did not differ significantly when using an interactive videodisc computer lab as compared to a traditional demonstration lab.
The National Gallery of Art's department of education resources has produced a new videodisc on the gallery's European collection.
He anticipated that patrons would have direct and immediate access to information stored on paper, videodisc, microform, or on regional, national, and international databases.
SEATTLE--The people who brought consumers the Breadman and the Juiceman are bringing demonstrations and tips to the kitchen in a '90s fashion-- with an integrated television, videodisc player and microprocessor.
Most teachers plan to use some of the new technologies within the next 1-3 years; 40% indicated that they were planning to use CD-ROM, videodisc and scanners within the next 3 years.