ADPCM with a multiquantizer for speech coding
Taniguchi, T.; Unagami, S.; Iseda, K.; Tominaga, S.
Selected Areas in Communications, IEEE Journal on
Volume 6, Issue 2, Feb 1988 Page(s):410 - 424
Digital Object Identifier   10.1109/49.616
Summary:A speech coding algorithm with low complexity and a short processing delay is introduced. The proposed algorithm is ADPCM (adaptive digital pulse code modulation) with a multiquantizer (ADPCM-MQ). The input signal is processed in parallel by multiple ADPCM coders with different characteristics. Then the optimum ADPCM coder with minimum error power is dynamically selected for each frame. A 16-kb/s codec based on this algorithm has been implemented using two general-purpose digital signal processors (MB8764) with 8.3 ms of total processing delay. A segmental SNR of 19-21 dB was achieved at 16 kb/s; with postfiltering the segmental SNR was increased to 23-25 dB. Combined with the time domain compression scheme, the algorithm can be easily applied to 8-kb/s coding. It is also extensible to variable-rate coding

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