G. standards

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 G.723    (withdrawn)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