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Matrix Surround

An analog approach to surround sound in which third and sometimes fourth channels of sound are folded into the two front stereo channels and later partially decoded in a reverse operation. Examples are SQ, QS, and Dolby Surround. Only a small portion of the original additional-channel information can be recovered, as opposed to Dolby Digital and DTS, where each of the six discrete channels can be totally recovered without mixing with the others.

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