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Acoustic Ranging

  • US 20080304361A1
  • Filed: 10/07/2007
  • Published: 12/11/2008
  • Est. Priority Date: 06/08/2007
  • Status: Active Grant
First Claim
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1. A method for a first device, the method comprising:

  • emitting a first acoustic signal;

    receiving the first acoustic signal at a first time;

    receiving a second acoustic signal at a second time, the second acoustic signal emitted by a second device;

    ascertaining a first value reflecting a difference between the first time and the second time;

    receiving from the second device at least a second value reflecting a difference between when the second device received the first acoustic signal and the second acoustic signal; and

    determining a distance between the first device and the second device responsive to at least the first value and the second value.

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