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Sub-band coding - Wikipedia
https://en.wikipedia.org/wiki/Sub-band_coding#:~:text=Subband%20coding%20resides%20at%20the%20heart%20of%20the,ADPCM%29%20within%20a%20bit%20rate%20of%2064%20kbit%2Fs.
Subband Coding - McMaster University
https://www.ece.mcmaster.ca/~shirani/multi12/subband.pdf
subband coding. • MPEG has proposed three coding schemes: Layer1, Layer2, Layer 3 • Coders are upward compatible: a layer N decoder is able to decode bitstream generated by the layer N-1 encoder • Layer1 and 2 coders use a bank of 32 filters. • Sampling frequencies are 32,000, 44,100, and 48,000. • Each subband is quantized with a variable number of bits.
Fast subband filtering in MPEG audio coding | IEEE ...
https://ieeexplore.ieee.org/document/300309/
Fast subband filtering in MPEG audio coding Abstract: Subband filtering is one of the most compute-intensive operations in the MPEG audio coding standard. The author proves that the matrixing operations in MPEG subband filtering can be efficiently computed using fast 32-point DCT or inverse DCT (IDCT) algorithms.
EE-597 Class Notes – Sub-Band Coding
https://www2.ece.ohio-state.edu/~schniter/ee597/handouts/subband_coding.pdf
• Of the major “signal-processing tools” used in MPEG-style audio coding schemes (see Fig. 1), sub-band coding is the last which we have yet to cover. input sub-band analysis freq. data quant. data psycho-acoustic model bit alloc & quantization stream formatting output Figure 1: Simplified MPEG-style audio coding system.
MPEG-1 Audio - Carnegie Mellon University
https://course.ece.cmu.edu/~ee899/lecture8.pdf
MPEG-1 Audio • Outline – Background – Psychoacoustics – Subband coding – Layer I and II – Layer III – Frame structure and packetization 18-899/Spring 1998/Chen MPEG-1 Audio • ISO/IEC 11172-3 (1988~1991) • First high quality audio compression standard • CD quality two-channel audio at 256 kbits/s
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