The Standard

The Enhanced Variable Rate Coder (EVRC) for CDMA is based on 3 codecs: full rate at 8.5 kbps, half rate at 4 kbps, and eighth rate at 800 bps.

The coder works on a frame of 160 speech samples (20 msec) and requires a look ahead of 80 samples (10 msec) for noise-suppression. So the total algorithmic delay for the coder is 30 msec.

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