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Method and device for encoding wideband speech capable of independently controlling the short-term and long-term distortions

  • US 20040073421A1
  • Filed: 07/17/2003
  • Published: 04/15/2004
  • Est. Priority Date: 07/17/2002
  • Status: Abandoned Application
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1. Wideband speech encoding method in which the speech is sampled in such a way as to obtain successive voice frames each comprising a predetermined number of samples, and with each voice frame are determined parameters of a code-excited linear prediction model, these parameters comprising a long-term excitation digital word extracted from an adaptive coded directory as well as a short-term excitation word extracted from a fixed coded directory, characterized in that the extraction of the long-term excitation word is performed using a first perceptual weighting filter comprising a first formantic weighting filter (PWF1), in that the extraction of the short-term excitation word is performed using the first perceptual weighting filter (PWF1) cascaded with a second perceptual weighting filter comprising a second formantic weighting filter (PWF2), and in that the denominator of the transfer function of the first formantic weighting filter is equal to the numerator of the second formantic weighting filter.

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