Binaural rendering of a multi-channel audio signal

H - Electricity – 04 – S

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H04S 3/00 (2006.01) H04S 1/00 (2006.01)

Patent

CA 2739651

Binaural rendering a multi-channel audio signal into a binaural output signal (24) is described. The multi-channel audio signal comprises a stereo downmix signal (18) into which a plurality of audio signals are downmixed, and side information comprising a downmix information (DMG, DCLD) indicating, for each audio signal, to what extent the respective audio signal has been mixed into a first channel and a second channel of the stereo downmix signal (18), respectively, as well as object level information of the plurality of audio signals and inter-object cross correlation information describing similarities between pairs of audio signals of the plurality of audio signals. Based on a first rendering prescription, a preliminary binaural signal (54) is computed from the first and second channels of the stereo downmix signal (18). A decorrelated signal (X n,k d) is generated as an perceptual equivalent to a mono downmix (58) of the first and second channels of the stereo downmix signal (18) being, however, decorrelated to the mono downmix (58). Depending on a second rendering prescription (P2 1,m), a corrective binaural signal (64) is computed from the decorrelated signal (62) and the preliminary binaural signal (54) is mixed with the corrective binaural signal (64) to obtain the binaural output signal (24).

L'invention porte sur le rendu binaural d'un signal audio multicanal dans un signal de sortie binaural (24). Le signal audio multicanal comprend un signal de sous-mixage stéréo (18) dans lequel une pluralité de signaux audio sont sous-mixés, et des informations auxiliaires comprenant des informations de sous-mixage (DMG, DCLD) indiquant, pour chaque signal audio, dans quelle mesure le signal audio respectif a été mixé dans un premier canal et un second canal du signal de sous-mixage stéréo (18), respectivement, ainsi que des informations de niveau d'objet de la pluralité de signaux audio et des informations d'intercorrélation entre objets décrivant des similarités entre des paires de signaux audio de la pluralité de signaux audio. Sur la base d'une première prescription de rendu, un signal binaural préliminaire (54) est calculé à partir des premier et second canaux du signal de sous-mixage stéréo (18). Un signal décorrélé (Xn,kd) est généré en tant qu'équivalent perceptuel d'un sous-mixage mono (58) des premier et second canaux du signal de sous-mixage stéréo (18), ledit signal décorrélé étant toutefois décorrélé du sous-mixage mono (58). Selon une seconde prescription de rendu (P21,m), un signal binaural correctif (64) est calculé à partir du signal décorrélé (62) et le signal binaural préliminaire (54) est mixé avec le signal binaural correctif (64) afin d'obtenir le signal de sortie binaural (24).

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