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Method and system for analyzing voices

  • US 6,349,277 B1
  • Filed: 10/29/1999
  • Issued: 02/19/2002
  • Est. Priority Date: 04/09/1997
  • Status: Expired due to Term
First Claim
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1. A method for analyzing voices by generating pitch mark information as time reference positions corresponding to a pitch cycle of voice waveforms comprising the steps of:

  • temporarily storing a portion of the voice waveforms using voice waveform storing means;

    generating rough pitch information from said voice waveforms stored temporarily by using pitch analyzing means;

    inputting said voice waveforms stored temporarily to an adaptive filter and changing a cut-off frequency or a center frequency of said adaptive filter according to said rough pitch information, and passing only a fundamental component extracted from the inputted voice waveforms; and

    detecting plural maximum points at one side of said fundamental component using peak detecting means, and generating a series of pitch mark information for a whole portion of the voice waveforms.

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