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modem
modem [ mo dulator/ dem odulator], an external device or internal electronic circuitry used to transmit and receive digital data over a communications line normally used for analog signals. A modem attached to a computer converts digital data to an analog signal that it uses to modulate a carrier...
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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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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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tape recorder
tape recorder device for recording information on strips of plastic tape (usually polyester) that are coated with fine particles of a magnetic substance, usually an oxide of iron, cobalt, or chromium. The coating is normally held on the tape with a special binder. Tape recorders can store many diff...
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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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camera
camera lightproof box or container, usually fitted with a lens, which gathers incoming light and concentrates it so that it can be directed toward the film (in an optical camera) or the imaging device (in a digital camera) contained within. Today there are many different types of camera in use, all...
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analog-to-digital conversion
analog-to-digital conversion the process of changing continuously varying data, such as voltage, current, or shaft rotation, into discrete digital quantities that represent the magnitude of the data compared to a standard or reference at the moment the conversion is made. There are two types of con...
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computer
computer device capable of performing a series of arithmetic or logical operations. A computer is distinguished from a calculating machine, such as an electronic calculator , by being able to store a computer program (so that it can repeat its operations and make logical decisions), by the numbe...
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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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