The Standard

ITU-T G.722.1 is the coder for wideband speech operating at bit rates of 24 and 32kbps. Like all wideband speech coders, in G.722.1 also, the speech signal is sampled at 16000 samples/second. G.722.1 can handle speech and audio signal bandwidth upto 7 kHz, compared to 3.6 kHz in narrow band speech coders.

G.722.1 coder is based on transform technology, using a modulated lapped transform (MLT). The coder operates on 20 msec frames (320 samples) of audio and has a look-ahead of 20 msec. The total algorithmic delay is 40 msec.

G.722.1 decoder can tolerate 2% FER (Frame Erasure Rate) in frame erasure conditions.

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