Audio signal coding method and apparatus, and audio signal decoding method and apparatus

An audio signal decoding method, comprising:

• parsing encoded data of a target audio frame to acquire low-frequency encoding information;
• decoding the low-frequency encoding information to acquire a low-frequency signal and a low-frequency residual signal;
• suppressing a frequency component in the low-frequency residual signal within a target frequency range to acquire a decoded suppression signal, wherein a center frequency of the target frequency range is a fundamental-tone frequency of the low-frequency residual signal;
• performing spectrum inversion on the decoded suppression signal to acquire a low-frequency excitation signal;
• performing signal reconstruction according to the low-frequency excitation signal to acquire a high-frequency signal;
• and
• generating an audio signal of the target audio frame according to the low-frequency signal and the high-frequency signal.

An electronic device, comprising a memory and a processor, wherein the memory is configured to store a computer program;

• and the processor is configured to, when executing the computer program, cause the electronic device to:
• acquire a high-frequency residual signal and a low-frequency residual signal of a target audio frame;
• suppress a frequency component in the low-frequency residual signal within a target frequency range to acquire an encoded suppression signal, wherein a center frequency of the target frequency range is a fundamental-tone frequency of the low-frequency residual signal;
• perform spectrum inversion on the encoded suppression signal to acquire a spectrum inversion signal;
• acquire a high-frequency energy gain of the target audio signal according to the spectrum inversion signal and the high-frequency residual signal;
• and
• generate encoded data of the target audio frame according to the high-frequency energy gain;
• or,
• parse encoded data of a target audio frame to acquire low-frequency encoding information;
• decode the low-frequency encoding information to acquire a low-frequency signal and a low-frequency residual signal;
• suppress a frequency component in the low-frequency residual signal within a target frequency range to acquire a decoded suppression signal, wherein a center frequency of the target frequency range is a fundamental-tone frequency of the low-frequency residual signal;
• perform spectrum inversion on the decoded suppression signal to acquire a low-frequency excitation signal;
• perform signal reconstruction according to the low-frequency excitation signal to acquire a high-frequency signal;
• and
• generate an audio signal of the target audio frame according to the low-frequency signal and the high-frequency signal.