Multi-channel signal encoding method, multi-channel signal decoding method, encoder, and decoder

A multi-channel signal decoding method, comprising:

• obtaining a bitstream;
• obtaining a downmixed signal of a first channel signal and a second channel signal in a multi-channel signal, an initial reverberation gain parameter for both of the first channel signal and the second channel signal based on performing a spatial parameter analysis on the first channel signal and the second channel signal, and identification information of the first channel signal and the second channel signal based on the bitstream, wherein the identification information indicates identifies a target channel signal, from at least one of the first channel signal or the second channel signal, in which the initial reverberation gain parameter needs to be adjusted based on at least one of a first correlation between the first channel signal and the downmixed signal and a second correlation between the second channel signal and the downmixed signal, and wherein the initial reverberation gain parameter is associated with a reverberation effect of the first channel signal and second channel signal;
• adjusting the initial reverberation gain parameter of the target channel signal based on at least one of the first correlation or the second correlation to obtain an adjusted reverberation gain parameter;
• obtaining, based on the downmixed signal, a reconstructed first channel signal and a reconstructed second channel signal;
• and
• performing, based on the adjusted reverberation gain parameter, a reverberation processing on at least one of the reconstructed first channel signal and the reconstructed second channel signal.

An encoder, comprising:

• a memory comprising instructions;
• a processor coupled to the memory and configured to execute the instructions that when executed, cause the processor to be configured to:
• obtain a downmixed signal of a first channel signal and a second channel signal in a multi-channel signal;
• obtain an initial reverberation gain parameter for both of the first channel signal and the second channel signal by performing a spatial parameter analysis on the first channel signal and the second channel signal, wherein the initial reverberation gain parameter is associated with a reverberation effect of the first channel signal and second channel signal;
• obtain identification information of the first channel signal and the second channel signal based on a first correlation between the first channel signal and the downmixed signal, and a second correlation between the second channel signal and the downmixed signal, wherein the identification information identifies a target channel signal, from at least one of the first channel signal or the second channel signal, in which the initial reverberation gain parameter needs to be adjusted based on at least one of the first correlation or the second correlation;
• quantize, based on the downmixed signal, the initial reverberation gain parameter, and the identification information, the first channel signal and the second channel signal to obtain a quantized first channel signal and a quantized second channel signal;
• and
• write the quantized first channel signal and the quantized second channel signal into a bitstream.

A decoder, comprising:

• a memory comprising instructions;
• a processor coupled to the memory and configured to execute the instructions that when executed, cause the processor to be configured to:
• obtain a bitstream;
• and
• obtain a downmixed signal of a first channel signal and a second channel signal in a multi-channel signal, an initial reverberation gain parameter for both of the first channel signal and the second channel signal based on performing a spatial parameter analysis on the first channel signal and the second channel signal, and identification information of the first channel signal and the second channel signal based on the bitstream, wherein the identification information identifies a target channel signal, from at least one of the first channel signal or the second channel signal, which the initial reverberation gain parameter needs to be adjusted based on at least one of a first correlation between the first channel signal and the downmixed signal and a second correlation between the second channel signal and the downmixed signal, and wherein the initial reverberation gain parameter is associated with a reverberation effect of the first channel signal and second channel signal;
• adjust the initial reverberation gain parameter of the target channel signal based on at least one of the first correlation or the second correlation to obtain an adjusted reverberation gain parameter;
• obtain, based on the downmixed signal, a reconstructed first channel signal and a reconstructed second channel signal;
• and
• perform, based on the adjusted reverberation gain parameter, a reverberation processing on at least one of the reconstructed first channel signal and the reconstructed second channel signal.