DOLBY (Surround/digital)
An analog/digital transmitted audio system developed by Dolby™ Laboratories for encoding audio surround channels within a videocassette / DVD / TV transmission mainly for home or cinema theatre use. The analog system adds three additional channels - center and delayed back right and left. The digital AC-3 system have the surround channels separated and digitally encoded. In both cases a special decoder is needed to retrieve the additional audio channels.
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