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Speech signal decoding method and apparatus, speech signal encoding/decoding method and apparatus, and program product therefor

  • US 6,910,009 B1
  • Filed: 10/31/2000
  • Issued: 06/21/2005
  • Est. Priority Date: 11/01/1999
  • Status: Active Grant
First Claim
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1. A speech signal decoding method for decoding information concerning at least a sound source signal, gain and linear prediction coefficients from a received signal, generating an excitation signal and linear prediction coefficients from decoded information, and driving a filter, which is constituted by the linear prediction coefficients, by the excitation signal to thereby decode a speech signal, comprising:

  • smoothing the gain using a past value of the gain;

    limiting the value of the smoothed gain based upon an amount of fluctuation calculated from the gain and the smoothed gain; and

    decoding the speech signal using the gain that has been smoothed and limited.

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