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Touch sensing method and apparatus

  • US 5,920,309 A
  • Filed: 01/04/1996
  • Issued: 07/06/1999
  • Est. Priority Date: 01/04/1996
  • Status: Expired due to Term
First Claim
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1. A method for detecting the presence of a finger or other appropriate object in proximate relationship to a touchpad comprisingproviding a modulator signal suitable for driving at least one trace of a touchpad sensor,providing a demodulator signal substantially in quadrature with the modulator signal for synchronously sensing the response of the at least one trace to the modulator signal, andconverting the response to a digital indicia.

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