TEMPORAL ENVELOPE SHAPING FOR SPATIAL AUDIO CODING USING FREQUENCY DOMAIN WIENER FILTERING.

摘要

Certain types of parametric spatial coding encoders use interchannel amplitudedifferences, interchannel time differences, and interchannel coherence orcorrelation to build a parametric model of a multichannel soundfield that isused by a decoder to construct an approximation of the original soundfield. However,such a parametric model does not reconstruct the original temporal envelopeof the soundfield's channels, which has been found to be extremely importantfor some audio signals. The present invention provides for the reshaping thetemporal envelope of one or more of the decoded channels in a spatial coding systemto better match one or more original temporal envelopes.