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Automatic speaker volume and microphone gain control in a portable handheld radiotelephone with proximity sensors

  • US 6,853,850 B2
  • Filed: 12/04/2000
  • Issued: 02/08/2005
  • Est. Priority Date: 12/04/2000
  • Status: Expired due to Fees
First Claim
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1. A method for controlling operation of a radiotelephone, the method comprising:

  • determining if a radiotelephone is activated for use;

    when the radiotelephone is activated, determining when the radiotelephone is within a selected proximity zone of a radiotelephone user;

    when the radiotelephone is activated and is within the proximity zone, estimating a distance d between the radiotelephone and the user and adjusting a volume control for a radiotelephone speaker according to the estimated distance, providing a minimum value Vs(min) of the sneaker volume control and a maximum value Vs(max) of the speaker volume control, and allowing the sneaker volume control to vary monotonically with the distance d between the values Vs(min) and Vs(max).

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