The following is a summary of digital voice standards from the ITU. These standards are used in the speech codecs that sample voice and convert it into digital code. See G.711.
Codec Sampling G. Coding Rate Number Method (kHz) Bit Rates (kBps) G.711 Mu-Law PCM 8 64 G.711 A-Law PCM 8 64 G.721 ADPCM 8 32 G.722 ASPCM 7 48, 56, 64 G.722.1 MLT 16 24, 32 G.722.2 ACELP 16 9 bit rates (6.6-23.85) G.723 (withdrawn) G.723.1 MP-MLQ 8 6.3 G.723.1 ACELP 8 5.3 G.726 ADPCM 8 16, 24, 32, 40, 64 G.727 ADPCM 8 16, 24, 32, 40, 64 G.728 LD-CELP 8 16 G.729 CS-ACELP 8 8
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
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