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Speech dialogue system for realizing improved communication between user and system

  • US 5,548,681 A
  • Filed: 08/13/1992
  • Issued: 08/20/1996
  • Est. Priority Date: 08/13/1991
  • Status: Expired due to Term
First Claim
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1. A speech dialogue system, comprising:

  • microphone means for receiving a speech input uttered by a human speaker and outputting microphone output signals;

    speech recognition means for receiving input signals and recognizing the speech input received by the microphone means;

    synthetic speech response generation means for generating a synthetic speech response appropriate for the speech input recognized by the speech recognition means;

    loudspeaker means for outputting the synthetic speech response to the human speaker; and

    synthetic speech response cancellation means for cancelling the synthetic speech response, which is outputted from the loudspeaker means and then received by the microphone means, from the microphone output signals, to obtain input signals to be supplied to the speech recognition means from which the speech recognition means recognizes the speech input, the synthetic speech response cancellation means further comprising;

    look-up table means for memorizing speech characteristic information on the synthetic speech response to be outputted from the loudspeaker means;

    adaptive filter means for adapting the synthetic speech response generated by the synthetic speech response generation means by multiplying the synthetic speech response with filter coefficients calculated according to the speech characteristic information memorized in the look-up table means, to obtain an adapted synthetic speech response; and

    subtractor means for subtracting the adapted synthetic speech response obtained by the adaptive filter means from the microphone output signals, to obtain the input signals supplied to the speech recognition means.

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