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Method and apparatus for recognizing deformed speech

  • US 6,006,180 A
  • Filed: 01/27/1995
  • Issued: 12/21/1999
  • Est. Priority Date: 01/28/1994
  • Status: Expired due to Term
First Claim
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1. A system for processing a non-deformed speech signal spectrum, the speech signal spectrum having a first and a second frequency which represent a respective formant of said speech signal, the system comprising:

  • extraction means responsive to said speech signal to extract therefrom an excitation signal representative of the sound and vibration sources of the speech;

    envelope determination means responsive to said speech signal to compute coefficients characteristic of the shape of the spectrum envelope of said speech signal;

    interpolation means responsive to said excitation signal to generate an interpolated excitation signal having a waveform that is identical to the waveform of said excitation signal and having a point density that is about two to three times the point density of said excitation signal;

    synthesizer means responsive to said interpolated excitation signal and said characteristic coefficients to synthesize a deformed speech signal;

    electronic means for linearly increasing the frequencies of the formants of said speech signal by a factor of about 2 to 3.

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