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Combining frequency warping and spectral shaping in HMM based speech recognition

  • US 5,930,753 A
  • Filed: 03/20/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 03/20/1997
  • Status: Expired due to Term
First Claim
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1. A signal processing method for recognizing unknown speech signals, comprising the following steps:

  • (A) receiving an unknown speech signal;

    (B) generating a frequency warped sequence of feature vectors characterizing the unknown speech signal;

    (C) simultaneously adapting a set of recognition unit models to the unknown speech signal using a linear transformation while generating said frequency warped sequence of feature vectors; and

    (D) recognizing the unknown speech signal based on said frequency warped sequence of feature vectors and the set of adapted recognition unit models.

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