GSM-FR is a 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 13 kbps.

This coder uses the principle of Regular Pulse Excitation-Long Term Prediction-Linear Predictive coding.

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.

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