CodecPro EVS Codec
3GPP new standard codec

The Enhanced Voice Services (EVS) coder consists of a multi-rate (5.9 to 128 kbps) audio coder optimized for operation with voice and music/mixed content signals, a source controlled rate scheme including a voice/sound activity detector and a comfort noise generation system, and an error concealment mechanism to combat the effects of transmission errors and lost packets. Jitter buffer management is also provided with EVS. The EVS coder also provides enhanced interoperation with AMR-WB over all nine source bitrates from 6.6 to 23.85 kbps. The EVS speech coder is capable of switching its bitrate every speech frame upon command.


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

Bandwidth 50 – 24000 Hz
Standardized 3GPP 2014
Technology ACELP & Transform Coding
Bit rate 5.9 to 128 kbps and interoperable with AMR-WB (6.6 to 23.85 kbps)
Delay (msec) 25 - 32
Frame size (msec) 20
Lookahead (msec) 5 - 12
Quality Narrowband, Wideband, SuperWideband and Fullband
Complexity (MIPS) 86
ROM (bytes) 285K
RAM (bytes) 175K

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