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ICASSP
2008
IEEE

Perceptually weighted distortion measures and the tandem connection of speech codecs

11 years 6 months ago
Perceptually weighted distortion measures and the tandem connection of speech codecs
Tandem connections of voice codecs can occur today in mobileto-mobile calls and for certain VoIP connections. While postfiltering in tandem encodings is well-understood, the effects of the perceptual weighting filter in CELP codecs in tandem encodings has not been investigated. We study the impact of perceptual weighting filters on tandem coding using the rate distortion theory of discrete-time autoregressive (AR) sources with a frequency weighted error criterion and by examining tandem connections involving the AMR-NB codec. We show that for the usual method of calculating the perceptual weighting based upon the codec input, the perceptual weighting has a cumulative effect that is more pronounced at lower bit rates.
Niranjan Shetty, Jerry D. Gibson
Added 30 May 2010
Updated 30 May 2010
Type Conference
Year 2008
Where ICASSP
Authors Niranjan Shetty, Jerry D. Gibson
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