Methods and apparatus for pitch determination

  • US 7,124,075 B2
  • Filed: 05/07/2002
  • Issued: 10/17/2006
  • Est. Priority Date: 10/26/2001
  • Status: Active Grant
First Claim
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1. A method for determining the pitch of a sampled digitized speech signal, comprising the steps of:

  • embedding a portion of the sampled digitized speech signal into an m-dimensional state space to obtain a sequence of m-dimensional vectors;

    selecting closest pairs of vectors in state space from a plurality of possible pairs of m-dimensional vectors in said sequence of m-dimensional vectors;

    accumulating a total number of the selected closest pairs of vectors for each of a plurality of time separation values to produce a histogram of accumulated numbers; and

    locating at least a highest peak in a portion of said histogram to obtain a pitch period value for said portion of the sampled digitized speech signal.

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