Temporal envelope shaping for spatial audio coding using...

G - Physics – 10 – L

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G10L 19/00 (2006.01) G10L 19/02 (2006.01)

Patent

CA 2589623

Certain types of parametric spatial coding encoders use interchannel amplitude differences, interchannel time differences, and interchannel coherence or correlation to build a parametric model of a multichannel soundfield that is used by a decoder to construct an approximation of the original soundfield. However, such a parametric model does not reconstruct the original temporal envelope of the soundfield's channels, which has been found to be extremely important for some audio signals. The present invention provides for the reshaping the temporal envelope of one or more of the decoded channels in a spatial coding system to better match one or more original temporal envelopes.

Certains types de codeurs à codage spatial paramétrique utilisent des différences d'amplitude entre canaux, des différences temporelles entre canaux et une cohérence ou corrélation entre canaux pour former un modèle paramétrique d'un champ acoustique multicanaux qui est utilisé par un décodeur pour effectuer une approximation du champ acoustique d'origine. Toutefois, ce modèle paramétrique ne rétablit pas l'enveloppe temporelle d'origine des canaux du champ acoustique qui s'est avéré être extrêmement importante pour certains signaux audio. Cette invention porte également sur la reconfiguration de l'enveloppe temporelle d'un ou plusieurs des canaux décodés d'un système de codage spatial de sorte que celle-ci s'adapte mieux à une ou plusieurs enveloppes temporelles d'origine.

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