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G726 decoder - asm.js
4.0
These routines comprise an implementation of the CCITT G.726 16 Kbps ADPCM coding algorithm. Essentially, this implementation is identical to the bit level description except for a few deviations which take advantage of workstation attributes, such as hardware 2's complement arithmetic.
The ITU-T G.726 coder is an adaptive differential pulse code modulation (ADPCM) waveform coding algorithm, suitable for coding of digitized telephone bandwidth (0.3-3.4 kHz) speech or audio signals sampled at 8 kHz. This coder operates on a sample-by-sample basis. Input samples may be represented in linear PCM or companded 8-bit G.711 (m-law/A-law) formats
(i.e., 64 kbps). For 32 kbps operation, each sample is converted into a 4-bit quantized difference
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