The audio coding system which American Dolby Laboratories developed. It is known generally with name of "Dolby sound". Because- it consists of channel 1 for silent playback in addition to the sound (front left and right, center and rear left and right) of channel 5 it becomes independent,also 5.1 are called. We are adopted by we are expressed per 1 second as the data of 384 kilobits.
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