ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec
The present document contains an electronic copy of the ANSI‑C code for the GSM Enhanced Full Rate codec. The ANSI‑C code is necessary for a bit exact implementation of the Enhanced Full Rate speech transcoder (GSM 06.60 [3]), Voice Activity Detection (GSM 06.82 [7]), comfort noise (GSM 06.62 [5]), Discontinuous Transmission (GSM 06.81 [6]) and example solutions for substituting and muting of lost frames (GSM 06.61 [4]).