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Soft decision signal estimation

  • US 6,349,278 B1
  • Filed: 08/04/1999
  • Issued: 02/19/2002
  • Est. Priority Date: 08/04/1999
  • Status: Expired due to Term
First Claim
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1. A method for estimating a speech signal contained within a received signal including both a speech component and a noise component, said method comprising:

  • a) inputting the received signal to a receiver filter and a voice activity detector;

    b) computing a likelihood ratio within said voice activity detector based on the power of said received signal;

    c) computing a speech probability estimate within said voice activity detector based on said likelihood ratio and the a priori probability of speech;

    d) outputting said speech probability estimate from said voice activity detector;

    d) filtering said received signal within said receiver filter to obtain a filter output signal; and

    e) combining said filter output signal with said speech probability estimate output from said voice activity detector to produce a soft estimate of said speech signal.

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