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Pitch or periodicity estimation

  • US 8,280,725 B2
  • Filed: 05/28/2009
  • Issued: 10/02/2012
  • Est. Priority Date: 05/28/2009
  • Status: Active Grant
First Claim
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1. A method of estimating a pitch period of a first portion of a signal inputted to a signal processing apparatus, the first portion overlapping a previous portion of said signal, the method comprising the signal processing apparatus performing the following:

  • computing a first autocorrelation value for part of the first portion not overlapping the previous portion;

    retrieving a stored second autocorrelation value for part of the first portion overlapping the previous portion, the second autocorrelation value having been computed during estimation of a pitch period of the previous portion;

    forming a combined autocorrelation value using the first and second autocorrelation values; and

    selecting the estimated pitch period in accordance with the combined autocorrelation value.

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