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Method and apparatus for automatically adjusting speaker and microphone gains within a mobile telephone

  • US 6,744,882 B1
  • Filed: 03/30/1999
  • Issued: 06/01/2004
  • Est. Priority Date: 07/23/1996
  • Status: Expired due to Fees
First Claim
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1. An apparatus for adjusting the gain of a speaker of a mobile telephone, said apparatus comprising:

  • means for detecting the background noise level of the environment in which the mobile telephone is operating, wherein the background noise level for a current frame of speech is a function of a background noise level of a past frame of speech and a frame energy level of the current frame of speech;

    means for compressing a current frame of speech using a compression threshold value to limit signal values;

    means for determining available headroom, the available headroom dependent on the compression threshold value;

    means for determining a target speaker volume based on the background noise level;

    means for comparing the available headroom to the target speaker volume; and

    means for setting the gain of the speaker of the mobile telephone based upon comparing the available headroom to the target speaker volume.

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