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POSITION-BASED STYLUS COMMUNICATION

  • US 20170344174A1
  • Filed: 05/31/2016
  • Published: 11/30/2017
  • Est. Priority Date: 05/31/2016
  • Status: Active Grant
First Claim
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1. A touch-sensitive device, comprising:

  • a plurality of sense channels configured to receive signals from an input device at a plurality of touch sensors;

    a plurality of digital signal processors coupled to outputs of the plurality of sense channels, wherein the plurality of digital signal processors includes a plurality of first demodulators configured to demodulate the received signals;

    a position estimation processor configured to estimate a location of the input device based on a first plurality of received signals processed by the plurality of digital signal processors, and configured to select a subset of the plurality of sense channels coupled to one or more touch sensors proximate to the input device based on the estimated location of the input device; and

    one or more correlators couplable to the selected subset of the plurality of sense channels, wherein the one or more correlators comprise a plurality of second demodulators, the second demodulators configured to demodulate a second plurality of received signals from the selected subset of the plurality of sense channels, the one or more correlators configured to determine frequency content of the demodulated signals.

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