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Dolby Digital
Formerly known as 'AC-3' or 'Dolby Digital AC-3', Dolby Digital is a versatile, high-quality audio compression system. Dolby Digital allows five discrete full-range (20Hz to 20kHz) channels (left, center, right, left surround, right surround), and a limited frequency (20Hz to 120Hz) LFE or Low Frequency Effects channel to fit into one quarter of the space previously needed to reproduce CD's two channels. Dolby Digital's first theatrical appearance was in the 1992 release Batman Returns; its first domestic appearance was on the 1995 LaserDisc release of Clear And Present Danger. Dolby Digital is one of DVD-Video's audio standards, and is used on virtually all DVDs.
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