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 That format fell into disuse, becoming superseded by the laser disc system, which uses a laserlaser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 ?
Are your VCR or videodisc movies more interactive than your old projector movies?
Accordingly, in a second project (Bullis, Thorkildsen, & Reiman, 1989), discussed here, we (a) examined the efficacy of group versus individual administration modes and three-option multiple choice versus true/false item formats and (b) transferred the TCB to a Level I videodisc (a form that is in many ways similar to videotape, because there is no connection to a computer, but is durable, has rapid access, and could be used in conjunction with computer programs).
Movement between screens is easy and interaction between software and videodisc is smooth and quick.
The difference between videodisc and CD is in the way they store information.
We helped Amway design an interactive videodisc kiosk for their internal trade show attended by their distributors; this game-like program quizzed users on product knowledge, and printed out their scores and certificates that could be used to enter a drawing for a prize.
Sometimes called a laser disc, a videodisc is another silvery platter, the size of a long-playing record.
The more interesting and relevant types of training media that came to prominence in the 1980s included videotape, audiotape, and videodisc.
It will also examine a new approach to security training, interactive videodisc training.
Leaders in the toy, video game, education, publishing, and computing worlds agree and these divisions are blurring; David Shefrin, Chairman of the Interactive Video Industry Association and an interactive videodisc pioneer formerly with IBM, says broadcasters are recognizing that they can be publishers, too.
The division took on computer software development; a videodisc project; an NGS-Apple Computer-Lucasfilm co-production for the classroom; and a collaboration with the American Association of Geographers and school districts around the country.
They include his rating from "bomb" to four stars with brief reviews, release date in country of origin, running time, whether made in color, director, principal cast, MPAA rating, and availability on videodisc, laserdisc, or DVD.