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System and method for performing pitch estimation and error checking on low estimated pitch values in a correlation based pitch estimator

  • US 5,774,836 A
  • Filed: 04/01/1996
  • Issued: 06/30/1998
  • Est. Priority Date: 04/01/1996
  • Status: Expired due to Term
First Claim
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1. A method for performing pitch error checking in a correlation-based pitch estimator, comprising:

  • receiving a speech waveform comprising a plurality of frames;

    performing a correlation calculation for a first frame of said plurality of frames of said speech waveform, wherein said correlation calculation produces one or more correlation peaks;

    determining a first determined pitch value for said first frame from said one or more correlation peaks, wherein said first determined pitch value corresponds to a first determined correlation peak;

    determining if said first determined pitch value is less than a pitch threshold value;

    setting said first determined pitch value as a pitch value for said first frame if said first determined pitch value is not less than said pitch threshold value;

    performing error checking on said first determined pitch value to determine if said first determined pitch value should be set as the pitch value for said first frame if said first determined pitch value is less than said pitch threshold value, wherein said performing error checking includes determining if any pitch multiples of said first determined pitch value have missing correlation peaks; and

    determining a new determined pitch value for said first frame from at least a subset of said one or more correlation peaks, wherein said determining said new determined pitch value does not use said first determined correlation peak, wherein said determining said new determined pitch value is performed if any pitch multiples of said first determined pitch value have missing correlation peaks.

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