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  • Video and audio players designed to reproduce (playback) video and sound information stored in a special type of optical disk known as digital versatile disk (DVD). These recorders usually consist of an electromechanical device that includes an optical reader with a red light laser (typically 650 nm wavelength), data processors, controls, and a slot to place a DVD. The players may also include a digital/analog converter and other accessories such as a display and loudspeakers to playback both video and audio signals (typical in portable players) or provide output to video reproduction systems (e.g., monitors or television sets). Most DVD players have capabilities to play audio and video optical compact discs (CDs); some can also provide output for high-definition television sets (i.e., up-conversion to 720 or 1080 lines). DVD players are available in tabletop, rack mounted, and portable versions; most DVD recorders include also play-back capabilities.
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