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CodecPro EVRC family Codecs
3GPP2 CDMA standard codec

EVRC (Speech Service Option 3) is a source codec and operates three different engines/rates depending on the source signal: full rate (8.3 kbps), half rate (4 kbps), and eighth rate (800 bps). The lowest rate is for background noise. The EVRC typical average bitrate is around 6 kbps.

EVRC-B (Speech Service Option 68) is a source codec. EVRC-B operates with the same engines/rates as EVRC. EVRC-B includes a new feature of being able to operate at eight average rates or capacity operating points ranging from 4 to 8.3 kbps.

EVRC-C or EVRC-WB (Speech Service Option 70) is a source codec. EVRC-C is the same codec as EVRC-B with a wideband extension. EVRC-C supports two operating points of EVRC-B (4 and 8.3 kbps) and a new wideband operating point at 7.5 kbps.

EVRC-D or EVRC-NW (Speech Service Option 73) is the same codec as EVRC-C except it has additional operating points.

EVRC-E or EVRC-NW2K (Speech Service Option 77) is the same codec as EVRC-D. EVRC-E has modified operating points and a new 2K bps rate. EVRC-E supports EVRC-B, EVRC-C (EVRC-WB) and EVRC-D (EVRC-NW).

EVRC-A/B/C/D/E CODEC OVERVIEW

The memory and CPU details are generic Standard specifications, for more detail and information about CodecPro's EVRC family optimisation, please contact us at sales@codecpro.com.

  EVRC EVRC-B EVRC-C EVRC-D EVRC-E
Bandwidth 200–3400 Hz 200–3400 Hz 50–7000 Hz 50–7000 Hz 50–7000 Hz
Standardized TIA 1997 3GPP2 2006 3GPP2 2007 3GPP2 2009 3GPP2 2011
Technology RCELP/ACELP CELP/PPP/NELP CELP/LPC/PPP/NELP CELP/LPC/PPP/NELP CELP/LPC/PPP/2K/NELP
Bitrate(kbps) 6 4 to 8.3 4 to 7.5 4 to 7.5 2 to 7.5
Delay(ms) 23 23 23 23 23
Frame(ms) 20 20 20 20 20
Lookahead(ms) 3 3 3 3 3
Quality Narrowband Narrowband Wideband Wideband Wideband
Complexity 30 MIPS 40 MIPS      
ROM(bytes) 200K 200K      
RAM(bytes) 20K+10K/ch 20K+10K/ch      

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


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