Method and apparatus for avoiding unmasking of coding noise when mixing perceptually coded multi-channel audio signals

摘要

Playback of certain multi-channel audio signal representations on a particular loudspeaker set-up requires a special rendering, which usually consists of a matrixing operation. If a particular individual loudspeaker set-up on which the matrix of the matrixing operation depends is not known at the perceptual coding stage, a noise unmasking problem occurs. According to the invention, this problem can be solved by decorrelating the individual audio channel signals before perceptual encoding and recorrelating them after the perceptual decoding.