Audio coding method and apparatus, and electronic device and storage medium

An audio decoding method, performed by a decoder and comprising:

• receiving an encoded stream sent by an encoder, wherein the encoded stream comprises encoded information of a plurality of channel groups, the plurality of channel groups are obtained by performing a grouping on a channel sequence sequentially, each of the plurality of the channel groups comprises a plurality of consecutive channels in the channel sequence, and adjacent channel groups comprise one or more identical channels;
• decoding the plurality of channel groups sequentially, and determining, for a current channel group decoded, a target decoding matrix corresponding to the current channel group in each frequency band in a frequency band set according to encoded information of the current channel group;
• obtaining a decoded frequency domain coefficient of the current channel group for the encoded information of the current channel group based on the target decoding matrix for the current channel group in each frequency band;
• and
• obtaining a decoded audio signal in each channel in the channel sequence according to the decoded frequency domain coefficients of the plurality of channel groups.

An encoder, comprising:

• a processor;
• and
• a memory for storing instructions executable by the processor,
• wherein the processor is configured to;
• obtain a plurality of channel groups by performing a grouping on a channel sequence, wherein each of the plurality of channel groups comprises a plurality of consecutive channels in the channel sequence, and adjacent channel groups comprise one or more identical channels;
• obtain a frequency domain coefficient of each frame in each channel by performing a frequency domain conversion on an audio signal in each channel in the channel sequence frame by frame;
• determine a target transformation matrix corresponding to the channel group in each frequency band in a frequency band set from a transformation matrix set according to the frequency domain coefficient of each channel;
• obtain encoded information of the channel group by performing an identical-band decorrelation processing on the frequency domain coefficient of the channel in the channel group based on the target transformation matrix in each frequency band;
• and
• obtain an encoded stream based on the encoded information of the channel group, and send the encoded stream to a decoder for decoding.