Concept for bridging the space between parametric multichannel audio coding and matrix surround multichannel coding

摘要

Multichannel audio decoder (200) for processing a downmix audio signal (204) derived in a manner compatible with matrix envelope and for processing first parametric data (206) describing a first portion of a multichannel signal, in which for a second portion of the multichannel signal does not process parametric data or second parametric data (208), the second parametric data (208) requiring less information units than the first parametric data (206) when an identical portion of the multichannel signal is described , comprising: a processor (202) to derive an intermediate signal (210) from the downmix audio signal (204), using a first derivation rule to derive a first portion of the intermediate signal, the first corresponding portion of the intermediate signal to the first portion of the multichannel audio signal, on which the first derivation rule depends d e the first parametric data (206) and comprises a first set of matrix elements of a predecorrelation matrix (M1) or a mixing matrix (M2); and using a second derivation rule to derive a second portion of the intermediate signal, using the second derivation rule no parametric data or the second parametric data (208), in which the processor (202) is operative to calculate the second derivation rule from the information in the downmix audio signal (204) or from the second parametric data (208) and comprises a second set of matrix elements of the predecorrelation matrix (M1) or the matrix of mixture (M2), in which the first portion and the second portion are a portion of time or a portion of frequency.