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Method and apparatus for formant tracking using a residual model

  • US 7,424,423 B2
  • Filed: 04/01/2003
  • Issued: 09/09/2008
  • Est. Priority Date: 04/01/2003
  • Status: Expired due to Fees
First Claim
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1. A method of tracking formants in a speech signal, the method comprising:

  • defining a formant search space comprising sets of formants;

    identifying formants in a first frame of the speech signal using the entirety of the formant search space by utilizing a residual model that models a difference between an input feature vector representing a frame of the speech signal and a feature vector mapped from a set of formants, wherein utilizing the residual model comprises sequentially applying feature vectors mapped from each of the sets of formants in the formant search space to the residual model to identify a probability for each set of formants; and

    identifying formants in a second frame of the speech signal using the entirety of the formant search space.

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