Pertaining to frequencies of a normally audible sound wave (15 to 20000Hz). Audio has been, until recently, a very neglected side of video recording and processing. Very often, during videotape duplication and enhancement, the quality of the soundtrack is detrimentally affected. Several special soundtrack enhancement devices and integrated audio and video enhancers have recently appeared on the market (see Audio Equalization and Audio Exciter). New VCRs and TV systems employ Hi-Fi quality sound tracks, and are sometimes equipped with decoders for DOLBY SURROUND, AC-3 or other three-dimensional sound encoding devices.
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