Patent ID: 8976972
Filing Date: 2015-03-10
Classification: G10L,H04S

Abstract:
1. A method for processing sound data encoded in a sub-band domain, for dual-channel playback of binaural or Transaural® type, wherein a matrix filtering is applied so as to pass from a sound representation with N channels with N>0, to a dual-channel representation, said sound representation with N channels consisting in considering N virtual loudspeakers surrounding the head of a listener, and, for each virtual loudspeaker of at least some of the loudspeakers: the matrix filtering applied comprising a multiplicative coefficient defined by the spectrum, in the sub-band domain, of the second transfer function deconvolved with the first transfer function, and wherein the coefficients of the matrix are expressed, for a contralateral path, at least as a function of respective spatialization gains of the M channels on the N virtual loudspeakers situated in a hemisphere around a first ear, and of the spectra of the contralateral transfer function, relating to the second ear of the listener, deconvolved with the ipsilateral transfer function, relating to the first ear, while, for an ipsilateral path, the coefficients of the matrix are expressed as a function of spatialization gains of the M channels on the N virtual loudspeakers situated in a hemisphere around a first ear, and wherein the representation with N channels comprises, per hemisphere around an ear, at least one direct virtual loudspeaker and one ambience virtual loudspeaker, the coefficients of the matrix being expressed, in a sub-band domain as time-frequency transform, by: where: