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Controlling a weighting filter based on the spectral content of a speech signal

  • US 7,010,480 B2
  • Filed: 09/13/2001
  • Issued: 03/07/2006
  • Est. Priority Date: 09/15/2000
  • Status: Expired due to Term
First Claim
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1. A method for preparing a speech signal for encoding, the method comprising:

  • providing a pitch pre-processing weighting filter including a core weighting filter component and a low-pass filter;

    providing a fixed-codebook weighting filter including the core weighting filter component and a high-pass filter;

    providing an adaptive-codebook weighting filter including the core weighting filter component;

    determining whether a spectral content of the speech signal is representative of a defined spectral characteristic;

    controlling said low-pass filter and said high-pass filter based on a determination of the spectral content of the speech signal.

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