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Systems, methods, and apparatus for gain factor attenuation

  • US 9,043,214 B2
  • Filed: 04/21/2006
  • Issued: 05/26/2015
  • Est. Priority Date: 04/22/2005
  • Status: Active Grant
First Claim
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1. A method of signal processing, said method being implemented by a wireless communications device, the method comprising:

  • calculating an envelope of a first signal that is based on a low-frequency portion of a speech signal;

    calculating an envelope of a second signal that is based on a high-frequency portion of the speech signal;

    calculating a plurality of gain factor values according to a time-varying relation between the calculated envelopes, wherein each of the plurality of gain factor values is based on a calculated value of the time-varying relation over a different corresponding time period, and wherein the time-varying relation is one among a difference between the calculated envelopes and a ratio between the calculated envelopes;

    calculating a value of a change in a relation between the calculated envelopes, wherein the change is a change over time; and

    based on the calculated value of the change, attenuating at least one of the plurality of gain factor values.

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