Audio signal encoding and decoding method and apparatus

An audio signal decoding method, comprising:

• obtaining group information of M blocks of a current frame of an audio signal from a bitstream, wherein the group information indicates M transient state identifiers of the M blocks;
• decoding the bitstream using a decoding neural network to obtain a decoded spectra of the M blocks;
• performing inverse grouping and arranging on the decoded spectra of the M blocks based on the group information of the M blocks to obtain an inverse grouping arranged spectra of the M blocks;
• and
• obtaining a reconstructed audio signal of the current frame based on the inverse grouping arranged spectra of the M blocks;
• wherein the group information indicates a transient state identifier or a non-transient state identifier, wherein a spectrum of a block in the M blocks corresponds to the transient state identifier is arranged before a spectrum of a block in the M blocks corresponds to the non-transient state identifier in the bitstream.

A non-transitory computer-readable storage medium, comprising a bitstream stored thereon, wherein the bitstream is generated by the method comprising:

• obtaining, based on a spectra of M blocks of a current frame of a to-be-encoded audio signal, M transient state identifiers of the M blocks, wherein the M blocks comprise a first block, and a transient state identifier of the first block indicates that the first block is a transient state block or a non-transient state block;
• obtaining group information of the M blocks based on the M transient state identifiers of the M blocks;
• performing grouping and arranging on the spectra of the M blocks based on the group information of the M blocks to obtain a to-be-encoded spectrum of the current frame;
• encoding the to-be-encoded spectrum using an encoding neural network to obtain a spectrum encoding result;
• and
• writing the spectrum encoding result into a bitstream;
• wherein the performing grouping and arranging on the spectra of the M blocks based on the group information of the M blocks to obtain the to-be-encoded spectrum of the current frame comprises:
• allocating, to a transient state group, a spectrum of a block that is in the M blocks and that is indicated by the M transient state identifiers as a transient state block;
• allocating, to a non-transient state group, a spectrum of a block that is in the M blocks and that is indicated by the M transient state identifiers as a non-transient state block;
• and arranging the spectrum of the block allocated to the transient state group to be before the spectrum of the block allocated to the non-transient state group to obtain the to-be-encoded spectrum of the current frame;
• or
• arranging a spectrum of a block that is in the M blocks and that is indicated by the M transient state identifiers as a transient state block to be before a spectrum of a block that is in the M blocks and that is indicated by the M transient state identifiers as a non-transient state block to obtain the to-be-encoded spectrum of the current frame.