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Speech recognition and synthesis systems which distinguish speech phonemes from noise

  • US 5,966,690 A
  • Filed: 06/07/1996
  • Issued: 10/12/1999
  • Est. Priority Date: 06/09/1995
  • Status: Expired due to Fees
First Claim
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1. A speech recognition system for recognizing speech in an environment of noise and disturbing sound, comprising:

  • means for receiving a sound signal, the sound signal including at least one of phonemes and time series of phonemes, and the sound signal further including at least one of noise and disturbing sound;

    an analysis means for analyzing the sound signal received by the means for receiving; and

    a recognition means for recognizing a signal representative of said phonemes and time series of phonemes;

    wherein the analysis means analyzes the sound signal by performing a frequency analysis and the result of the frequency analysis is treated as a time series in determining if a feature point of the sound signal moves in a prescribed direction in a frequency analysis space relative to a time index axis for a prescribed time period; and

    wherein the analysis means separates said noise and disturbing sound from said phonemes and time series of phonemes based upon said analyzing and outputs a signal representative of said phonemes and time series of phonemes to the recognition means.

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