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Acoustical proximity detection for mobile terminals and other devices

  • US 6,542,436 B1
  • Filed: 06/30/2000
  • Issued: 04/01/2003
  • Est. Priority Date: 06/30/2000
  • Status: Expired due to Term
First Claim
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1. A method for detecting if an object is in proximity to a communication device, comprising steps of:

  • generating a measurement signal;

    driving an output acoustic speech transducer of the communications device with the measurement signal, wherein the measurement signal is <

    20,000 Hz;

    monitoring an input acoustic speech transducer of the communications device to detect the measurement signal; and

    determining that an object is in proximity to the communications device based on a detected alteration of the measurement signal.

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