Signal detector employing mean energy and variance of energy content comparison for noise detection

  • US 5,323,337 A
  • Filed: 08/04/1992
  • Issued: 06/21/1994
  • Est. Priority Date: 08/04/1992
  • Status: Expired due to Term
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First Claim
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1. A signal detector for discriminating between signals manifesting noise and signals manifesting information appearing at an input, said signal detector comprising:

  • means for sampling said signals at said input;

    filter means for determining for each signal sample, energy content of each of a plurality of frequency cells in said signal sample; and

    processor means for determining the mean energy content and variance of the energy content, as determined by said filter means, across all frequency cells in a signal sample, said processor means also deriving a comparison signal by comparing said mean energy content and variance of energy content in a signal sample, a comparison signal indicating an approximate equality and manifesting said sample as probable noise.

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