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Method and apparatus for detecting speech

  • US 5,152,007 A
  • Filed: 04/23/1991
  • Issued: 09/29/1992
  • Est. Priority Date: 04/23/1991
  • Status: Expired due to Term
First Claim
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1. A method of generating a first signal representing the detection of speech on a second signal having background noise, a magnitude, a zero crossing rate and is divided in time by frames having a predetermined time period, the method comprising the steps of:

  • characterizing, in absence of speech, the background noise of the second signal comprising the steps of;

    computing an average of the magnitude of the second signal for a second predetermined number of frames, andcomputing an average of the zero crossing rate of the second signal for said second predetermined number of frames;

    computing background noise magnitude and zero crossing rate thresholds for the second signal;

    computing an average of the magnitude of the second signal for a first frame;

    computing a zero crossing rate of the second signal for said first frame;

    comparing said average of the magnitude of the second signal to said background noise magnitude threshold;

    comparing said zero crossing rate of the second signal to said background noise zero crossing rate threshold; and

    generating, upon said average of the magnitude or said zero crossing rate consecutively exceeding said background noise threshold a first predetermined number of frames, the first signal.

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