Patent ID: 8583424
Filing Date: 2013-11-12
Classification: G10L,H04S

Abstract:
1. A method implemented in an audio signal decoder for spatially synthesizing a downmix signal to obtain at least two output signals, the downmix signal together with spatialization parameters being output by a parametric coding by matrixing of an original multi-channel signal, the method comprising the steps, executed by a processor of the audio signal decoder, of: decorrelating the downmix signal to obtain a decorrelated signal; applying a synthesis matrix whose coefficients depend on the spatialization parameters, to the decorrelated signal and to the downmix signal so as to obtain said output signals, wherein for at least one value range of at least one spatialization parameter, the coefficients of the synthesis matrix are determined according to a criterion for minimizing a quantitative function, relating to the quantity of decorrelated signal in each of the output signals obtained by the step of applying the synthesis matrix, wherein the quantitative function is such that the increase in absolute value of the coefficients of the synthesis matrix that are applied to the decorrelated signal increases the value of said function applied to these same coefficients.