Audio signal encoding method, apparatus and computer readable medium

An audio signal encoding apparatus, comprising:

• at least one processor;
• and
• a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, wherein the programming instructions instruct the at least one processor to:
• allocate bits to sub-bands of a current frame of the audio signal, such that at least a part of the sub-bands have bits allocated;
• select, from the sub-bands having bits allocated, sub-bands for secondary bit allocation according to a secondary bit allocation parameter, wherein the sub-bands for secondary bit allocation are only a part of the sub-bands having bits allocated;
• perform, based on a quantity of bits allocated for each of the sub-bands having bits allocated other than the sub-bands for secondary bit allocation, a pulse quantity determination operation on each of the sub-bands having bits allocated other than the sub-bands for secondary bit allocation to determine a quantity of surplus bits of the current frame and a quantity of pulses for each of the sub-bands having bits allocated other than the sub-bands for secondary bit allocation;
• allocate the surplus bits to the sub-bands for secondary bit allocation;
• and
• perform, based on a quantity of bits allocated for each of the sub-bands for secondary bit allocation, a pulse quantity determination operation on each of the sub-bands for secondary bit allocation to determine a quantity of pulses for each of the sub-bands for secondary bit allocation.

A non-transitory computer readable medium storing a program causing a computer to execute audio signal encoding process, the audio signal encoding process comprising:

• allocating bits to sub-bands of a current frame of the audio signal, such that at least a part of the sub-bands have bits allocated;
• selecting, from the sub-bands having bits allocated, sub-bands for secondary bit allocation according to a secondary bit allocation parameter, wherein the sub-bands for secondary bit allocation are only a part of the sub-bands having bits allocated;
• performing, based on a quantity of bits allocated for each of the sub-bands having bits allocated other than the sub-bands for secondary bit allocation, a pulse quantity determination operation on each of the sub-bands having bits allocated other than the sub-bands for secondary bit allocation to determine a quantity of surplus bits of the current frame and a quantity of pulses for each of the sub-bands having bits allocated other than the sub-bands for secondary bit allocation;
• allocating the surplus bits to the sub-bands for secondary bit allocation;
• and
• performing, based on a quantity of bits allocated for each of the sub-bands for secondary bit allocation, a pulse quantity determination operation on each of the sub-bands for secondary bit allocation to determine a quantity of pulses for each of the sub-bands for secondary bit allocation.