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Method and system for improved discontinuous speech transmission

  • US 5,978,760 A
  • Filed: 07/21/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 01/29/1996
  • Status: Expired due to Term
First Claim
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1. A method of transmitting speech signals in a discontinuous transmission system, comprising the steps of:

  • segmenting the speech signals into non-overlapping frames;

    detecting voice activity in each of said non-overlapping frames;

    classifying said each of said non-overlapping frames as either speech or noise in response to said detecting step;

    if said voice activity is classified as speech, computing and transmitting parameters representing said non-overlapping frames classified as speech; and

    if said voice activity is classified as noise,reclassifying a portion of said non-overlapping frames classified as noise to noise-analysis frames;

    computing auto-correlation values for said noise-analysis frames;

    computing a weighted average of said auto-correlation values to represent said noise-analysis flames; and

    transmitting said weighted average values as noise parameters for use in generating comfort noise.

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