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Voiced/unvoiced decision based on frequency band ratio

  • US 5,960,388 A
  • Filed: 06/09/1997
  • Issued: 09/28/1999
  • Est. Priority Date: 03/18/1992
  • Status: Expired due to Term
First Claim
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1. A method for processing an audio signal, comprising the steps of:

  • generating frequency domain data by dividing an input audio signal on a block-by-block basis thereby determining blocks of data, and performing time domain to frequency domain conversion on each of the blocks thereby generating the frequency domain data;

    dividing the frequency domain data for at least one of the blocks into plural bands;

    deciding, for each of the bands for one of the blocks, whether said each of the bands is voiced or unvoiced;

    if at least one of the bands for said one of the blocks is voiced, identifying as a highest frequency voiced band a voiced band whose center frequency is F, where F is the highest center frequency among said at least one of the bands for said one of the blocks which are voiced; and

    generating boundary point data indicative of a boundary point between a voiced sound region and an unvoiced sound region of said one of the blocks in accordance with the number BVH of bands of the frequency domain data for said one of the blocks which have center frequency less than the center frequency F.

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