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Touch pad

  • US 7,411,581 B2
  • Filed: 02/05/2003
  • Issued: 08/12/2008
  • Est. Priority Date: 02/06/2002
  • Status: Expired due to Term
First Claim
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1. A touch pad for acquiring acoustic signals resulting from touch events, comprising:

  • a surface having an area in which said touch events may be formed;

    a plurality of transducers for acquiring said acoustic signals at a plurality of different locations in said surface;

    an output for supplying representations of said acoustic signals to an analog to digital converter; and

    an arrangement for electrically combining said acoustic signals from a plurality of said different locations into a combined signal for said output, said arrangement including connections for connecting together a plurality of said transducers in antiphase so as to electrically combine preferred components of said acoustic signals and a resistance connected in parallel with an intrinsic capacitance of at least one of said transducers to form a high pass filter that emphasizes said preferred components.

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