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Using multiple signals to detect touch input

  • US 10,444,909 B2
  • Filed: 03/17/2017
  • Issued: 10/15/2019
  • Est. Priority Date: 04/26/2011
  • Status: Active Grant
First Claim
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1. A system for detecting a location of a touch input, comprising:

  • a plurality of transmitters coupled to a propagating medium and each configured to emit a signal that is distinguishable from other signals emitted from other transmitters, wherein the plurality of transmitters are configured to emit the distinguishable signals through the propagating medium such that at least a portion of each of the distinguishable signals emitted from the plurality of transmitters propagate through the propagating medium without being directly guided in parallel directions by reflectors and each of the distinguishable signals ultrasonically encodes different binary data from other of the distinguishable signals to distinguish each of the distinguishable signals from each other; and

    a receiver coupled to the propagating medium and configured to receive the signals from the transmitters to detect the location of the touch input on a surface of the propagating medium as indicated by an effect of the touch input on each of the distinguishable signals, wherein the receiver is configured to receive the signals from the transmitters at least in part by being configured to receive a combined signal that includes at least a portion of each of the distinguishable signals disturbed by at least the same touch input at the location, each of the distinguishable signals that ultrasonically encodes different binary data from other of the distinguishable signals have been separately transmitted by a different transmitter of the plurality of transmitters, and the received combined signal is processed to separately identify each of the included portions of the distinguishable signals from the received combined signal, and the each of the included portions of the distinguishable signals that has been separately identified corresponds to at least a same single contact of the touch input provided at the same location, and for each of the separately identified included portions of the distinguishable signals, which specific corresponding transmitter of the plurality of transmitters transmitted the corresponding distinguishable signal and a corresponding relative location of the specific corresponding transmitter are identified for use in determining the location of the touch input.

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