CodecPro AMR Codec
3GPP mandatory standard codec

AMR was designed to allow transcoder-free connectivity between GSM, US-TDMA and PDC networks; AMR is the 3GPP mandatory standard codec for narrowband speech over GSM, WCDMA, GPRS and EDGE networks. AMR operates at 8 bitrates in the range of 4.75 to 12.2 kbps and was specifically designed to improve link robustness. AMR supports dynamic adaptation to network conditions, using lower bitrates during network congestion or degradation while preserving audio quality. AMR provides toll quality speech starting at 7.4 kbps, with near-toll quality at lower rates and greater robustness and better reproduction of non-speech sounds at higher rates.

The memory and CPU details are generic Standard specifications, for more detail and information about CodecPro's AMR optimisation, please contact us at

Bandwidth 200-3400 Hz
Standardized ETSI / 3GPP 1999
Technology ACELP
Bit rate 4.75/5.15/5.9/6.7/7.4/7.95/10.2/12.2 kbps
Delay (msec) 25
Frame size (msec) 20
Lookahead (msec) 5
Quality Narrowband / PSTN
Complexity (MIPS) 20
ROM (bytes) 150K
RAM (bytes) 20K

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2162 Laurier E. Montreal, QC Canada, H2H 1C2 Montreal, Canada
Phone: +1.514.916.3663