Method and apparatus for post-processing audio signal, storage medium, and electronic device

An apparatus for processing an audio signal, comprising a memory and a processor coupled to the memory, the processor being configured to:

• obtain a first speech signal acquired by a first device;
• perform frame blocking on the first speech signal, to obtain multiple speech signal frames;
• convert the multiple speech signal frames into multiple first frequency domain signal frames;
• perform aliasing processing on a first sub-frequency domain signal frame with a frequency lower than or equal to a target frequency threshold in each first frequency domain signal frame in the multiple first frequency domain signal frames, and reserve a second sub-frequency domain signal frame among the multiple first frequency domain signal frames with a frequency higher than the target frequency threshold in the each first frequency domain signal frames, to obtain multiple second frequency domain signal frames, the target frequency threshold being related to a sampling frequency of a second device, comprising:
• alternately enhancing and attenuating the first sub-frequency domain signal in the each first frequency domain signal frame, to obtain a third sub-frequency domain signal frame, and reserving the second sub-frequency domain signal in the each first frequency domain signal frame, to obtain the multiple second frequency domain signal frames, wherein a kth second frequency domain signal frame Xw′[k,n] of the multiple second frequency domain signal frames equals to the third sub-frequency domain signal frame obtained after aliasing processing is performed on the first sub-frequency domain signal frame in a kth first frequency domain signal frame of the first frequency domain signal frames when a frequency value n is less than or equal to the target frequency threshold;
• and
• perform frame fusion on the multiple second frequency domain signal frames, to obtain a second speech signal.

A non-transitory computer-readable storage medium, storing computer-readable instructions, the computer-readable instructions, when executed by a processor, causing the processor to perform operations comprising:

• obtaining a first speech signal acquired by a first device;
• performing frame blocking on the first speech signal, to obtain multiple speech signal frames;
• converting the multiple speech signal frames into multiple first frequency domain signal frames;
• performing aliasing processing on a first sub-frequency domain signal frame with a frequency lower than or equal to a target frequency threshold in each first frequency domain signal frame in the multiple first frequency domain signal frames, and reserving a second sub-frequency domain signal frame among the multiple first frequency domain signal frames with a frequency higher than the target frequency threshold in the each first frequency domain signal frame, to obtain multiple second frequency domain signal frames, the target frequency threshold being related to a sampling frequency of a second device, comprising:
• alternately enhancing and attenuating the first sub-frequency domain signal in the each first frequency domain signal frame, to obtain a third sub-frequency domain signal frame, and reserving the second sub-frequency domain signal in the each first frequency domain signal frame, to obtain the multiple second frequency domain signal frames, wherein a kth second frequency domain signal frame Xw′[k,n] of the multiple second frequency domain signal frames equals to the third sub-frequency domain signal frame obtained after aliasing processing is performed on the first sub-frequency domain signal frame in a kth first frequency domain signal frame of the first frequency domain signal frames when a frequency value n is less than or equal to the target frequency threshold;
• and
• performing frame fusion on the multiple second frequency domain signal frames, to obtain a second speech signal.