Encoding of multichannel digital audio signals

摘要

A method for coding a multi-channel audio signal representing a sound scene comprising a plurality of sound sources is provided. This method comprises decomposing the multi-channel signal into frequency bands and, per frequency band, obtaining directivity information per sound source of the sound scene, the information being representative of the spatial distribution of the sound source in the sound scene, of selecting a set of sound sources of the sound scene constituting principal sources, of matrixing the selected principal sources to obtain a sum signal with a reduced number of channels and, of coding the directivity information and of forming a binary stream comprising the coded directivity information, the binary stream being transmittable in parallel with the sum signal. A decoding method is also provided that is able to decode the sum signal and the directivity information to obtain a multi-channel signal, to an adapted coder and an adapted decoder.

主权项

1. A method for coding a multi-channel audio signal representing a sound scene comprising a plurality of sound sources, comprising a step of decomposing the multi-channel signal into frequency bands and the following steps per frequency band:
obtaining directivity information for identified sound sources of the sound scene, each identified sound source having a direction and an angular width and the directivity information being representative of at least the direction and the angular width of the respective sound source in the sound scene; selecting from among said identified sound sources a set of sound sources of the sound scene constituting principal sources; matrixing only the selected principal sources to obtain a sum signal with a reduced number of channels; and coding the directivity information and forming a binary stream comprising the coded directivity information, the binary stream being transmittable in parallel with the sum signal.