FAQ

Enhanced Variable Rate Codec

Known as: Evrc, IS-127 
Enhanced Variable Rate CODEC (EVRC) is a speech codec used in CDMA networks. It was developed in 1995 to replace the QCELP vocoder which used more… (More)
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Topic mentions per year

Topic mentions per year

1998-2014
02419982014

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Related topics

6 relations
4GVEnhanced Variable Rate Codec BFFmpegQualcomm code-excited linear prediction
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Related mentions per year

Related mentions per year

1994-2018
1990200020102020
Enhanced Variable Rate Codec
FFmpeg
Selectable Mode Vocoder
Qualcomm code-excited linear prediction
libavcodec
Enhanced Variable Rate Codec B

Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
2008
2008
RTP Payload Format for the Enhanced Variable Rate Wideband Codec (EVRC-WB) and the Media Subtype Updates for EVRC-B Codec
This document specifies Real-time Transport Protocol (RTP) payload formats to be used for the Enhanced Variable Rate Wideband… (More)
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2008
2008
Frame energy estimation based on speech codec parameters
This paper proposes an efficient method for estimating frame energy of speech from enhanced variable rate coder (EVRC) bitstream… (More)
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2007
2007
Enhancements to RTP Payload Formats for EVRC Family Codecs
This document updates the Enhanced Variable Rate Codec (EVRC) RTP payload formats defined in RFC 3558 with several enhancements… (More)
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2005
2005
Rate determination based on perceptual loudness
We describe a perceptually-motivated rate determination algorithm (RDA) for variable bit rate speech coding. Unlike existing rate… (More)
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2003
2003
A novel transcoding algorithm for AMR and EVRC speech codecs via direct parameter transformation
In this paper, a novel transcoding algorithm for the Adaptive Multi Rate (AMR) codec and the Enhanced Variable Rate Codec (EVRC… (More)
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2001
2001
An efficient transcoding algorithm for G.723.1 and EVRC speech coders
 
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Highly Cited
2000
Highly Cited
2000
Spectral enhancement based on global soft decision
In this letter, we propose a novel speech enhancement technique based on global soft decision. The proposed approach provides a… (More)
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2000
2000
Efficient codebook search method of EVRC speech codec
An efficient enhanced variable rate codec (EVRC) codebook search method based on a two-stage search is proposed. At the first… (More)
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Highly Cited
1999
Highly Cited
1999
Tracking speech-presence uncertainty to improve speech enhancement in non-stationary noise environments
Speech enhancement algorithms which are based on estimating the short-time spectral amplitude of the clean speech have better… (More)
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1998
1998
Robust speech mode based LSF vector quantization for low bit rate coders
Robust vector quantization of LSF parameters at a low bit rate is essential for voice coders operating below 5 Kbps. A novel… (More)
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