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Voiced/unvoiced estimation of an acoustic signal

  • US 5,216,747 A
  • Filed: 11/21/1991
  • Issued: 06/01/1993
  • Est. Priority Date: 09/20/1990
  • Status: Expired due to Term
First Claim
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1. A method for encoding an acoustic signal, the method comprising the steps of:

  • A. breaking the signal into segments, each of the segments representing one of a succession of time intervals;

    B. breaking each of said segments into a plurality of frequency bands; and

    C. considering in turn each of the segments as the current segment, and for each of a plurality of said frequency bands of the current segment making a voiced/unvoiced decision by a method comprising the steps of;

    evaluating a voicing measure for said frequency band;

    making the voiced/unvoiced decision for said frequency band based upon a comparison between the voicing measure and a threshold;

    determining an energy measure of the current segment;

    determining a measure of the signal energy of one or more recent prior segments;

    comparing the energy measure of the current segment to the measure of the signal energy of the one or more recent prior segments; and

    adjusting the threshold to make a voiced decision more likely when the energy measure of the current segment is greater than the measure of the signal energy of the one or more recent prior segments.

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