The Standard

iLBC is a speech codec developed for robust voice communication over IP. It is based on block-independent linear-predictive coding (LPC) algorithm. It is designed for narrow band speech, with a sampling rate of 8 kHz. The iLBC codec supports two basic frame lengths, giving a bit-rate of 13.3 kbps with an encoding frame length of 30 ms and 15.2 kbps with an encoding frame length of 20 ms. The codec enables graceful speech quality degradation in the case of lost frames, which occurs in connection with lost or delayed IP packets.

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