Method for parametric spatial audio coding and decoding, parametric spatial audio coder and parametric spatial audio decoder

摘要

A method for parametric spatial audio coding of a multi-channel audio signal comprising a plurality of audio channel signals is provided, the method comprising: calculating at least two different spatial coding parameters for an audio channel signal of the plurality of audio channel signals, selecting at least one spatial coding parameter of the at least two different spatial coding parameters associated with the audio channel signal on the basis of the values of the calculated spatial coding parameters; including a quantized representation of the selected spatial coding parameter into a parameter section of an audio bitstream; and setting a parameter type flag in the parameter section of the audio bitstream indicating the type of the selected spatial coding parameter being included into the audio bitstream.

主权项

1. A method implemented in a non-transitory computer-readable medium for parametric spatial audio coding of a multi-channel audio signal comprising a plurality of audio channel signals, the method comprising: calculating at least two different spatial coding parameters for an audio channel signal of the plurality of audio channel signals, wherein the at least two different spatial coding parameters are of at least two different types of spatial coding parameters and are calculated with regard to a reference audio signal, and wherein the reference audio signal is another audio channel signal of the plurality of audio channel signals or a downmix audio signal derived from at least two audio channel signals of the plurality of audio channel signals; selecting at least one spatial coding parameter of the at least two different spatial coding parameters associated with the audio channel signal on the basis of the values of the calculated spatial coding parameters; including a quantized representation of the selected spatial coding parameter into a parameter section of an audio bitstream; and setting a parameter type flag in the parameter section of the audio bitstream indicating the type of the selected spatial coding parameter being included into the audio bitstream wherein selecting the at least one spatial parameter comprises: selecting a first spatial coding parameter of a first spatial coding parameter type from the at least two spatial coding parameters in case the value of the first spatial coding parameter fulfills a predetermined first selection criterion associated to the first spatial coding parameter type; or selecting a second spatial coding parameter of a second spatial coding parameter type from the at least two spatial coding parameters in case the value of the first spatial coding parameter does not fulfill the predetermined first selection criterion associated to the first spatial coding parameter type and the value of the second spatial coding parameter fulfills a predetermined second selection criterion associated to the second spatial coding parameter type.