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Voice operated switch for use in high noise environments

  • US 6,141,426 A
  • Filed: 05/15/1998
  • Issued: 10/31/2000
  • Est. Priority Date: 05/15/1998
  • Status: Expired due to Term
First Claim
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1. A method for using a voice operated switch in changing high noise environments, the method comprising the steps of:

  • a) determining a relative energy of background noise by calculating a long-term average, a short-term average, and a short-term difference of the background noise, wherein;

    i) calculating the short-term average comprises summing an absolute value of a plurality of samples of audio data and applying a smoothing algorithm thereto;

    ii) calculating the long-term average comprises summing a plurality of short-term averages; and

    iii) calculating the short-term difference comprises computing a difference between consecutive short-term averages;

    b) calculating a VOX threshold;

    c) calculating a voice threshold;

    d) calculating a delta threshold;

    e) comparing the VOX threshold to an amplitude of an incoming data sample;

    f) when the amplitude of the incoming data sample is greater than the VOX threshold, then comparing the delta threshold to the short-term average delta;

    g) when the amplitude of the short-term average delta is greater than the delta threshold, then comparing the voice threshold to the short-term average; and

    h) when the short-term average is greater than the voice threshold, then the incoming data sample is determined to be voice and the voice operated switch is actuated.

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