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Speech recognition system for an automotive vehicle

  • US 4,538,295 A
  • Filed: 08/16/1982
  • Issued: 08/27/1985
  • Est. Priority Date: 08/16/1982
  • Status: Expired due to Fees
First Claim
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1. A speech recognition system for an automotive vehicle for activating vehicle actuators in response to a spoken instruction signal received through a microphone, comprising:

  • (a) a voice input section including notch filter means for attenuating frequency components of the signals received through the microphone at approximately 400 Hz;

    (b) voice detection means connected to said notch filter means for detecting beginning and end of spoken instruction signals and outputting instruction start and end signals for identifying, respectively, start and end of an instruction;

    (c) a plurality of bandpass filter means connected to said notch filter means for further filtering signals filtered through said notch filter means to human speech frequency components and to noise frequency components due to noise resulting from engine operation; and

    (d) voice analysis means connected to said bandpass filter means and responsive to the instruction start and end signals for analyzing the signals filtered through said bandpass filter means, comparing analyzed results with predetermined reference values corresponding to at least one spoken instruction, and for activating at least one actuator when the analyzed results match predetermined reference values associated with the actuator.

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