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Intelligibility control using ambient noise detection

  • US 8,744,091 B2
  • Filed: 11/12/2010
  • Issued: 06/03/2014
  • Est. Priority Date: 11/12/2010
  • Status: Active Grant
First Claim
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1. A method for modifying intelligibility of speech in a downlink voice signal during a call, comprising:

  • computing a current noise level estimate based on a) sampling ambient acoustic noise during the call, and b) a previously estimated noise level, by

         1) calculating a delta noise based on the sampled ambient acoustic noise and based on the previously estimated noise level,

         2) determining a slew rate.

         3) calculating a slew delta by multiplying the slew rate and a noise sampling period, and

         4) selecting the sampled ambient acoustic noise to be the current noise level estimate when the delta noise does not exceed the slew delta;

    determining an overall output gain based on the current noise level estimate and based on a user-selected volume setting;

    determining a frequency response based on the current noise level estimate and based on the user-selected volume setting; and

    modifying the downlink voice signal during the call in accordance with the overall output gain and the frequency response.

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