Multi-channel echo cancellation method and related apparatus

A computer device comprising:

• a memory storing program codes;
• and
• a processor configured to execute the program codes to:
• obtain a plurality of far-end audio signals outputted by a plurality of channels, respectively;
• obtain a first filter coefficient matrix corresponding to a kth frame of microphone signal outputted by a target microphone, comprising:
• obtaining a second filter coefficient matrix corresponding to a (k-1)th frame of microphone signal outputted by the target microphone, the first and second filter coefficient matrices respectively including frequency domain filter coefficients of filter sub-blocks corresponding to the plurality of channels, and k being an integer greater than or equal to 1;
• and
• determining the first filter coefficient matrix according to the second filter coefficient matrix, a gain coefficient, and a residual signal prediction value corresponding to the kth frame of microphone signal, wherein the residual signal prediction value corresponding to the kth frame of microphone signal represents an echo signal corresponding to a next frame of microphone signal predicted based on the second filter coefficient matrix;
• perform frame-partitioning and block-partitioning processing on the plurality of far-end audio signals to determine a far-end frequency domain signal matrix corresponding to the kth frame of microphone signal, the far-end frequency domain signal matrix including far-end frequency domain signals of the filter sub-blocks;
• perform filtering processing according to the filter coefficient matrix and the far-end frequency domain signal matrix to obtain an echo signal in the kth frame of microphone signal;
• and
• perform echo cancellation according to a frequency domain signal of the kth frame of microphone signal and the echo signal in the kth frame of microphone signal to obtain a near-end audio signal outputted by the target microphone.

A non-transitory computer-readable storage medium storing program codes that, when executed by a processor, cause the processor to:

• obtain a plurality of far-end audio signals outputted by a plurality of channels, respectively;
• obtain a first filter coefficient matrix corresponding to a kth frame of microphone signal outputted by a target microphone, comprising:
• obtaining a second filter coefficient matrix corresponding to a (k-1)th frame of microphone signal outputted by the target microphone, the first and second filter coefficient matrices respectively including frequency domain filter coefficients of filter sub-blocks corresponding to the plurality of channels, and k being an integer greater than or equal to 1;
• and
• determining the first filter coefficient matrix according to the second filter coefficient matrix, a gain coefficient, and a residual signal prediction value corresponding to the kth frame of microphone signal, wherein the residual signal prediction value corresponding to the kth frame of microphone signal represents an echo signal corresponding to a next frame of microphone signal predicted based on the second filter coefficient matrix;
• perform frame-partitioning and block-partitioning processing on the plurality of far-end audio signals to determine a far-end frequency domain signal matrix corresponding to the kth frame of microphone signal, the far-end frequency domain signal matrix including far-end frequency domain signals of the filter sub-blocks;
• perform filtering processing according to the filter coefficient matrix and the far-end frequency domain signal matrix to obtain an echo signal in the kth frame of microphone signal;
• and
• perform echo cancellation according to a frequency domain signal of the kth frame of microphone signal and the echo signal in the kth frame of microphone signal to obtain a near-end audio signal outputted by the target microphone.