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Voice activity detector for half-duplex audio communication system

  • US 5,598,466 A
  • Filed: 08/28/1995
  • Issued: 01/28/1997
  • Est. Priority Date: 08/28/1995
  • Status: Expired due to Term
First Claim
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1. A method of locating a noise floor for qualifying a signal, comprising the steps of:

  • establishing a noise power density function (NPDF), based on;

    a relationship between an approximate peak level of the signal and a current level of the signal, anda plurality of standard deviation values of the signal, each of the standard deviation values corresponding to one of a plurality of time intervals;

    repeatedly updating the NPDF to produce a current state of the NPDF; and

    using the current state of the NPDF to locate the noise floor.

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