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Enhanced Variable Rate Codec C ... EVRC-C is a wideband version of EVRC standardized by 3GPP2 circa 2007. It may also be referred to as EVRC-WB.
The EVRC-C codec uses a 20ms frame size to encode 16-bit speech signals sampled at 8 kHzor 16 kHz and generates compressed bit-streams of 171, 80, 40, or 16 bits. The speech signal spectrum is split into two bands corresponding to a high frequency band and a low frequency band which are compressed independently.
The high frequency band is is encoded using an LPC based scheme and the low frequency band is encoded using the EVRC-B standard., thus allowing for easy backward compatibility with EVRC-B.
There is also a generic audio coding mode that can be used for handling non-speech signals such as hold music and custom ring back tones.
References
editEVRC EVRC-B EVRC-C
External links
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