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Method and apparatus for discriminating non-sounds and voiceless sounds of speech signals from each other

  • US 6,070,135 A
  • Filed: 08/12/1996
  • Issued: 05/30/2000
  • Est. Priority Date: 09/30/1995
  • Status: Expired due to Fees
First Claim
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1. A method for discriminating non-sounds and voiceless sounds of speech signals, recorded on a recording medium, from each other when playing back the speech signals at a varied play-back speed, comprising the steps of:

  • setting a reference voltage level to be a predetermined value between a voltage level corresponding to the non-sounds and a voltage level corresponding to the voiceless sounds;

    detecting a pitch component of each waveform of the speech signals;

    comparing the absolute value of a voltage level of the detected pitch component with the reference voltage level; and

    distinguishing a portion of the speech signal associated with the detected pitch component based on the result of the comparing step to determine whether the portion of the speech signal is a non-sound or a voiceless.

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