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

  • US 5,986,224 A
  • Filed: 12/23/1998
  • Issued: 11/16/1999
  • Est. Priority Date: 04/19/1995
  • Status: Expired due to Term
First Claim
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1. A substrate for an acoustic touch sensor system comprising:

  • an acoustically transmissive medium having a surface with a touch sensitive region having at least one side;

    at least two reflective arrays, disposed parallel to one another and on the same side of the touch sensitive region, together having a two dimensional Fourier transform with at least two useful spacing vector components.

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