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LIMITED VOCABULARY SPEECH RECOGNITION CIRCUIT FOR MACHINE AND TELEPHONE CONTROL

  • US 3,742,143 A
  • Filed: 03/01/1971
  • Issued: 06/26/1973
  • Est. Priority Date: 03/01/1971
  • Status: Expired due to Term
First Claim
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1. Speech recognition apparatus for machine control comprising, in combination, first means for translating audio speech into a corresponding electrical analog signal, second means for translating said analog signal into a plurality Of binary signals comprising, a first circuit including zero crossing counter means, frequency-to-voltage converter means and first comparator means in a first serial combination, amplifier means, envelope detector means and second comparator means in a second serial combination, said first and second combinations being connected in parallel relation, said electrical analog signal being applied to said combinations from said first translating means, said binary signals each having a waveform presenting a first and a second level, each of said levels in each of said waveforms being indicative of the magnitude of a respective preselected speech parameter as being either above or below a respective preselected threshold level of said last named parameter, said combinations of said second translating means being responsive to a transition from either one of said levels to the other in any of said waveforms to generate a distinctive signal indicative of said transition, and word recognition logic circuitry responsive to a combination of said distinctive signals for generating an output signal uniquely indicative of a word or command as determined from said audio speech.

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