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optical disk
optical 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). WORM [ W rite O nce/ R ead M any] ...
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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 ...
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compact disc
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...
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multimedia
multimedia in personal computing, software and applications that combine text, high-quality sound, two- and three-dimensional graphics, animation, photo images, and full-motion video. In order to work with multimedia, a personal computer typically requires a powerful microprocessor, large memory an...
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slipped disc
slipped disc rupture or herniation of an intervertebral disc. These discs separate and cushion the vertebrae, the segments of the spinal column . They are composed of an outer rim of fibrous connective tissue and a gelatinlike inner core. If the fibrous rim breaks the core may leak into the spinal...
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videocassette recorder
videocassette 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. A VCR converts the separate audio and video portions of a television or video camera signal to magnetic flux variati...
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anemometer
anemometer, an instrument used to measure the velocity of the wind. It consists of a number of wind-driven cups connected to a vertical spindle which, as it rotates, moves a pointer on a scale marked in knots or miles an hour. In another type of anemometer, known as a ventimeter, the wind enters th...
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vertebral column
vertebral column (backbone; spinal column; spine) A flexible bony column in vertebrates that extends down the long axis of the body and provides the main skeletal support. It also encloses and protects the spinal cord and provides attachment for the muscles of the back. The vertebral column consists...
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digital circuit
digital circuit electronic circuit that can take on only a finite number of states. That is contrasted with analog circuits , whose voltages or other quantities vary in a continuous manner. Binary (two-state) digital circuits are the most common. The two possible states of a binary circuit are rep...
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code
code in communications, set of symbols and rules for their manipulation by which the symbols can be made to carry information. By this extended definition all written and spoken languages are codes. While these are sufficient and actually quite efficient in transmission of information, they are at ...
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