The Standard

ITU-T G.722 is the benchmark coder for wideband speech coding quality. Like all wideband speech coders, in G.722 also, the speech signal is sampled at 16000 samples/second. G.722 can handle speech and audio signal bandwidth upto 7 kHz, compared to 3.6 kHz in narrow band speech coders.

G.722 coder is based on the principle of Sub Band - Adaptive Differential Pulse Code Modulation (SB-ADPCM). The signal is split into two sub bands and samples from both bands are coded using ADPCM techniques. The system involving G.722 coder can be used to work in three modes 64, 56 and 48 kbit/s. The latter two modes will allow an auxiliary data channel of 8 and 16 kbit/s respectively, within the 64 kbit/s channel.

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