Patent ID: 8433583
Filing Date: 2013-04-30
Classification: G10L,H04S

Abstract:
1. An audio decoder comprising: receiver for receiving input data comprising an N-channel signal corresponding to a down-mixed signal of an M-channel audio signal, M>N, having complex valued subband encoding matrices applied in frequency subbands and parametric multi-channel data associated with the down-mixed signal; generator for generating frequency subbands for the N-channel signal, at least some of the frequency subbands being real-valued frequency subbands; determiner for determining real-valued subband decoding matrices for compensating the application of the encoding matrices in response to the parametric multi-channel data; and generator for generating down-mix data corresponding to the down-mixed signal by a matrix multiplication of the real-valued subband decoding matrices and data of the N-channel signal in the at least some real-valued frequency subbands.