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Speech signal processing apparatus for extracting a speech signal from a noisy speech signal

  • US 5,220,610 A
  • Filed: 05/28/1991
  • Issued: 06/15/1993
  • Est. Priority Date: 05/28/1990
  • Status: Expired due to Term
First Claim
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1. A signal processing apparatus comprising:

  • a band division means for performing a band division process including a Fourier transformation for an inputted speech signal and for outputting spectrum signals of plural channels;

    a cepstrum analysis means for performing a cepstrum analysis process for the spectrum signals of plural channels outputted from said band division means and for outputting a cepstrum analysis result;

    a speech judgment means for detecting a speech signal interval of the inputted noisy speech signal in response to the cepstrum analysis result outputted from said cepstrum analysis means and for outputting the detected speech signal interval; and

    a speech extracting means for extracting a speech signal from the inputted noisy speech signal according to the detected speech signal interval outputted from said speech judgment means, and for outputting the extracted speech signal;

    wherein said speech judgment means comprises;

    a peak detection means for detecting a peak of a cepstrum in response to the cepstrum analysis result outputted from said cepstrum analysis means;

    an average value calculation means for calculating an average value of the cepstrum in response to the cepstrum analysis result outputted from said cepstrum analysis means, and for outputting the calculated average value of the cepstrum; and

    a speech judgment circuit for detecting a speech signal interval in response to the detected peak of the cepstrum outputted from said peak detection means and the calculated average value of the cepstrum outputted from said average value calculation means;

    wherein said signal processing apparatus further comprises;

    a feature extraction means for extracting a speech feature from the extracted speech signal outputted from said speech extracting means, and for outputting the extracted speech feature;

    a storage means for initially storing standard speech features of plural speakers; and

    a feature comparison means for recognizing speech by comparing the extracted speech features outputted from said feature extraction means with the standard speech features stored in said storage means.

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