ok its matrix encoded into a stereo signal and has to be processed later my mistake its still no where near as good as DD
Quote:
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Matrix encoding does not allow one to encode several channels in fewer channels without losing information: one cannot fit 5 channels into 2 (or even 3 into 2) without losing information, as this loses dimensions: the decoded signals are not independent. The idea is rather to encode something that will both be an acceptable approximation of the surround sound when decoded, and acceptable (or even superior) stereo.
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http://en.wikipedia.org/wiki/Matrix_decoder