G.711.1 is defined in ITU-T Recommendation G.711.1: “Wideband embedded extension for G.711 pulse code modulation”

G.711 is an embedded wideband speech and audio coding algorithm operating at 64, 80 and 96 kbit/s.

When sampled at 16 kHz, the output of the G.711.1 coder can encode signal with a bandwidth of 50-7000 Hz (wideband) at 80 and 96 kbit/s, and for 8-kHz sampling, the output may produce signal with a bandwidth ranging from 50 up to 4000 Hz, operating at 64 and 80 kbit/s. At 64 kbit/s, G.711.1 is compatible with G.711, hence an efficient deployment in existing G.711 based Voice over IP (VoIP) infrastructures is foreseen. The coder operates on 5 ms frames, has a maximum algorithmic delay of 11.875 ms.

The encoder produces an embedded bitstream structured in three layers corresponding to three available bit rates: 64, 80 and 96 kbit/s. The bitstream can be truncated at the decoder side or by any component of the communication system to adjust the bit rate to the desired value.

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