Audio signal encoding method, decoding method, encoding device, and decoding device

An encoder comprising:

• a memory configured to store instructions;
• and
• one or more processors coupled to the memory and configured to execute the instructions to cause the encoder to:
• encode a plurality of frames;
• obtain a current frame of an audio signal, wherein the current frame comprises a high frequency band signal and a low frequency band signal;
• perform bandwidth extension processing based on the high frequency band signal, the low frequency band signal, and preset configuration information of a bandwidth extension to obtain a parameter of the bandwidth extension of the current frame;
• obtain tile information indicating a first frequency range in which tonal component detection is to be performed on the high frequency band signal,
• wherein the tile information comprises at least one of:
• relationship information indicating a value relationship between the first frequency range and a second frequency range when the first frequency range is different from the second frequency range, wherein the second frequency range corresponds to the bandwidth extension indicated by the preset configuration information;
• or a quantity of changed tiles in which there is a difference between the first frequency range and the second frequency range when the first frequency range is different from the second frequency range, wherein the tile information comprises a first quantity of tiles in the first frequency range, wherein a first lower limit of the first frequency range is the same as a second lower limit of the second frequency range,
• wherein a first distribution of one or more tiles in the first frequency range is the same as a second distribution of one or more tiles in the second frequency range when the first quantity of tiles is less than or equal to a second quantity of tiles in the second frequency range, and
• wherein when the first quantity of tiles is greater than the second quantity of tiles:
• a first frequency upper limit of the first frequency range is greater than a second frequency upper limit of the second frequency range;
• a third distribution of one or more tiles in an overlapping part of the first frequency range and the second frequency range is the same as the second distribution;
• and
• a fourth distribution of one or more tiles in a non-overlapping part of the first frequency range and the second frequency range is based on a preset manner;
• perform the tonal component detection in the first frequency range to obtain first tonal component information of the high frequency band signal;
• perform bitstream multiplexing with reference to the parameter of the bandwidth extension and the first tonal component information to obtain a payload bitstream for each of the plurality of frames;
• perform bitstream multiplexing with reference to the tile information to obtain a configuration bitstream comprising the tile information,
• wherein the configuration bitstream comprises configuration information shared by the plurality of frames;
• and
• send the tile information to a decoding device by using the configuration bitstream.

A non-transitory computer-readable storage medium comprising computer-executable instructions that, when executed by one or more processors, cause an encoder to:

• encode a plurality of frames;
• obtain a current frame of an audio signal, wherein the current frame comprises a high frequency band signal and a low frequency band signal;
• perform bandwidth extension processing based on the high frequency band signal, the low frequency band signal, and preset configuration information of a bandwidth extension to obtain a parameter of the bandwidth extension of the current frame;
• obtain tile information indicating a first frequency range in which tonal component detection is to be performed on the high frequency band signal,
• wherein the tile information comprises a first quantity of tiles in the first frequency range and identification information indicating whether the first frequency range is the same as a second frequency range corresponding to the bandwidth extension indicated by the preset configuration information, wherein a first lower limit of the first frequency range is the same as a second lower limit of the second frequency range,
• wherein a first distribution of one or more tiles in the first frequency range is the same as a second distribution of one or more tiles in the second frequency range when the first quantity of tiles is less than or equal to a second quantity of tiles in the second frequency range, and
• wherein when the first quantity of tiles is greater than the second quantity of tiles:
• a first frequency upper limit of the first frequency range is greater than a second frequency upper limit of the second frequency range;
• a third distribution of one or more tiles in an overlapping part of the first frequency range and the second frequency range is the same as the second distribution;
• and
• a fourth distribution of one or more tiles in a non-overlapping part of the first frequency range and the second frequency range is based on a preset manner;
• perform the tonal component detection in the first frequency range to obtain tonal component information of the high frequency band signal;
• perform bitstream multiplexing with reference to the parameter of the bandwidth extension and the tonal component information to obtain a payload bitstream for each of the plurality of frames;
• perform bitstream multiplexing with reference to the tile information to obtain a configuration bitstream comprising the tile information, wherein the configuration bitstream comprises configuration information shared by the plurality of frames;
• and
• send the tile information to a decoding device by using the configuration bitstream.