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Method and apparatus for active ultrasonic touch devices

  • US 9,477,350 B2
  • Filed: 04/19/2012
  • Issued: 10/25/2016
  • Est. Priority Date: 04/26/2011
  • Status: Active Grant
First Claim
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1. A system for determining a user indication, comprising:

  • a communication interface configured to send a signal to be used to propagate from a single transmitter, a freely propagating signal through a propagating medium with a surface and receive a first received signal including the freely propagating signal that has been disturbed by a disturbance on the surface, wherein the freely propagating signal has been allowed to freely propagate through the propagating medium in multiple directions to a plurality of receivers on a plurality of axes of the propagating medium without guiding the freely propagating signal through a specific directional path on the propagating medium; and

    a processor coupled to the communication interface and configured to process the first received signal to at least in part determine a user indication associated with the disturbance,wherein determining the user indication associated with the disturbance includes correlating with a first reference signal at least a first portion of the first received signal including a first binary sequence content to determine a first correlation result, correlating a second portion of the first received signal with a third reference signal to determine a third correlation result, and correlating with a second reference signal at least a portion of a second received signal including a second binary sequence content to determine a second correlation result, and the first reference signal, the second reference signal and the third reference signal are different reference signals.

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