Synthetic sub-band filtering method for audio decoding and synthetic sub-band filter
An audio decoding and synthesizer technology, applied in the field of audio decoding, can solve the problems of difficult chip cost and large area occupied by storage units, and achieve the effects of saving computing resources and storage resources, reducing area overhead, and good scalability.
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[0053] During audio decoding, the SubBand Synthesis Filter is usually used to map the demultiplexed multiple (for example, 32) subband frequency domain samples to the time domain, and finally superimpose and output, for example, 32 PCM samples. Complete the audio decoding inverse mapping (inverse mapping) part, which is the largest and most complex unit in the entire MPEG decoding algorithm.
[0054] In the MPEG decoding algorithm, the IDCT coefficient matrix size is, for example, 32*64, and the IDCT coefficient generation formula is as follows:
[0055] IM [ i ] [ k ] = cos [ ( i + 16 ) * ( 2 * k ...
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