GSM-EFR is a Enhanced Full Rate speech coder standardized by the European Telecommunications Standards Institute (ETSI) for compressing toll quality speech (8000 samples /second). The coder has a bit rate of 12.2kbps. This is a very robust speech coder, with very good speech quality better than 32 kbps ADPCM coder.

This coder uses the principle of Algebraic Code Excited Linear Prediction (ACELP).

The coder works on a frame of 160 speech samples (20 msec), and no look ahead is required. So the algorithmic delay for the coder is 20 msec.

Currently Encore’s G.711 is available on TI’s TMS320C64x (c64x), TMS320C62x (c62x) platforms.

GSM-EFR Product Brief - Download PDF

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