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Method and system for updating noise estimates during pauses in an information signal

  • US 6,108,610 A
  • Filed: 10/13/1998
  • Issued: 08/22/2000
  • Est. Priority Date: 10/13/1998
  • Status: Expired due to Fees
First Claim
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1. A method for estimating the power of frequency components of an information signal from an input signal containing both the information signal and noise and updating an estimation of noise power of the frequency components, said method comprising:

  • producing a set of frequency components of the information signal;

    calculating the total power in each frequency component of the set of frequency components;

    estimating the power of a previous noise reduced output;

    calculating a gain for each frequency component as a function of the total power in each frequency component of the information signal, the estimated power of the previous noise reduced output and an estimate of a noise power of the noise;

    multiplying each frequency component of the set of frequency components by a corresponding said gain to produce an estimate of the power of each frequency component of said information signal;

    detecting a pause in the information signal, further comprising for each frequency component;

    determining whether the total power in each frequency component of said information signal exceeds a first predetermined threshold, andif the total power in each frequency component of said information signal exceeds the first predetermined threshold, then determining whether a threshold value exceeds a second predetermined thresholds wherein the pause is detected if the threshold value exceeds the second predetermined threshold, andupdating the estimate of the noise power during the pause detected in the information signal.

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