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Acoustic condition sensor employing a plurality of mutually non-orthogonal waves

  • US 7,683,894 B2
  • Filed: 01/20/2006
  • Issued: 03/23/2010
  • Est. Priority Date: 04/19/1995
  • Status: Expired due to Fees
First Claim
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1. A method of determining information relating to a contact on a contact sensitive device comprising:

  • providing a member capable of supporting mechanical propagation of a vibration having a vibration frequency and at least one sensor adapted for producing a signal at the vibration frequency representing vibrations in the member;

    applying a contact to the member at a location which perturbs the mechanical propagation of the vibration;

    producing the signal using the at least one sensor, representing the perturbed mechanical vibration at the vibration frequency, while preserving phase information therein; and

    digitally processing the signal at an oversampled rate with respect to the vibration frequency, to calculate the location of the contact based on at least a phase of the sensed signal representing the perturbed mechanical vibration.

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