compact disc

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compact disc

(CD), a small plastic disc used for the storage of digital data. As originally developed for audio systems, the sound signal is sampled at a rate of 44,100 times a second, then each sample is measured and digitally encoded on the 4 3-4 in (12 cm) disc as a series of microscopic pits on an otherwise polished surface. The disc is covered with a transparent coating so that it can be read by a laser beam. Since nothing touches the encoded portion, the CD is not worn out by the playing process. Introduced in 1982, the CD offered other advantages over the phonograph record and recording tape—smaller size, greater dynamic range, extremely low distortion—and met with rapid consumer acceptance; the CD became the music carrier of choice by 1991, when sales exceeded those of audiocassettes.

Other CD formats include CD-ROM [Compact Disc–Read Only Memory], a form of CD that is read (but not written to) by computer using a CD-ROM drive and that can contain computer programs and digitized text, sound, photographs, and video; CD-R [Compact Disc–Recordable] and CD-RW [Compact Disc–ReWritable], which can be written to one time and multiple times, respectively. Interactive CDs (CD-I, CDTV, and other formats) can store video, audio, and data. Photo CD is a format that holds digitized photographs and sound. There are also CD-ROMs that require special players with built-in microcomputers.

Other optical diskoptical disk,
any of a variety of information storage disks that are played or read using a laser. Optical disks include compact discs (CDs and CD-ROMs), laser discs (see videodisc), and digital versatile discs (or digital video discs; DVDs and DVD-ROMs).
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 formats include digital versatile (or video) discs and videodiscs. A digital versatile diskdigital 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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 (DVD) holds far more information than a CD. DVD players are backward compatible to existing technologies, so they can also play a CD (or CD-ROM), but a CD player cannot be used with a DVD (or DVD-ROM). The videodiscvideodisc
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
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, or laser disk system, uses 12-in. (30-cm) disks for video recording. Its technology, unlike that of the CD, is an analog system that uses a laser to read a variable-width track, much like a conventional phonograph record.

compact disc

a small digital audio disc on which sound is recorded as a series of metallic pits enclosed in PVC; the disc is spun by the compact disc player and read by an optical laser system

Compact Disc

(CD) (Not "disk", this spelling is part of the standard).

A 4.72 inch disc developed by Sony and Philips that can store, on the same disc, still and/or moving images in monochrome and/or color; stereo or two separate sound tracks integrated with and/or separate from the images; and digital program and information files.

The same fabrication process is used to make both audio CDs and CD-ROMs for storing computer data, the only difference is in the device used to read the CD (the player or drive).

CD Information Center.
References in periodicals archive ?
The plastic used in compact discs can be recycled into other everyday items, including household products, building materials, and auto parts.
Compact discs hold 650-700 megabytes of data, movies or music, which puts them on the low end of the capacity-scale when compared with magnetic tape, hard drive, and other data storage options.
Another compression algorithm is being used to create audio/video files small enough to be played on most computers equipped with a compact disc player and speakers.
In 1994, China was the world's largest exporter of pirated compact discs, digital video discs and software on CD-ROM, said U.
Presently, the Company is one of the leaders in the sale of Audiophile compact discs and albums by such artists as Frank Sinatra, Ray Charles, Bob Dylan, The Doors, the Eagles, Paul McCartney, Cream, Miles Davis, Creedence Clearwater Revival and others.
Sullivan said recordable compact discs answer a consumer demand.
Last week, I was in a huge Manhattan music store shopping for compact discs.
MRC Polymers, which also uses compact discs as part of its feedstock, makes extensive use of impact modifiers, according to Staniulis.
JVC Disc America, a leading manufacturer and distributor of compact discs, CD-ROMs and DVDs, implemented the HighJump solution at its Kennesaw, Ga.
Folks who burn compact discs at home as collections of MP3 digital music files are usually stymied when it comes to listening to them easily on the go.
Taking a different tack in Christmas decorating, Hank and Joani Waring strung more than 1,000 silvery, glittery compact discs around their home.
14 /PRNewswire/ -- Corel Corporation (Nasdaq-NNM: COSFF; TSE:COS)announced today the release of Corel(R) CD Creator, CD writer software that allows users to easily produce digital audio, data or mixed mode compact discs in a Windows 3.

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