Digital speech decoder having a postfilter with diminished time variant spectral tilt

Digital speech decoder having a postfilter with diminished time variant spectral tilt

  • CN 1,078,371 C
  • Filed: 10/15/1990
  • Issued: 01/23/2002
  • Est. Priority Date: 10/17/1989
  • Status: Active Grant
First Claim
Patent Images

1. utilize the number language synthetic method of the postfilter that can reduce distortion spectrum may further comprise the steps:

  • A) provide a pumping signal to the LPC wave filter;

    B) provide a synthesized speech signal from the LPC wave filter;

    C) the synthetic postfilter of language of configuration, it requires to have first and second portion;

    D) provide a first of containing the first cover coefficient;

    E) at least a portion in the first cover coefficient is transformed to the set of parameter of replacing field of definition;

    F) handle the set of parameter of replacing field of definition, so that the corrected first cover coefficient to be provided;

    G) utilize the corrected first cover coefficient to obtain the second portion that the synthetic postfilter of language is used;

    H) with the synthesized speech signal in first and the synthetic postfilter of second portion filtering language, with the synthesized speech signal that provides to filter ripple.Wherein second portion is followed the trail of the general spectral shape of first adaptively, thereby reduces the time dependent spectral tilt of filter step introducing thus to greatest extent;

    I) synthesized speech signal with filtering becomes earcon.

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