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Tuning algorithm for noise reduction in an active stylus

  • US 8,581,886 B2
  • Filed: 03/22/2012
  • Issued: 11/12/2013
  • Est. Priority Date: 10/28/2011
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving a signal at a stylus, the stylus being operable to wirelessly transmit signals to and receive signals from a device, the stylus comprising a plurality of electrodes disposed in a tip of the stylus;

    comparing a first value of the signal to a first threshold;

    determining whether to start a timing period based at least in part on comparing the first value of the signal to the first threshold;

    if the timing period is started;

    comparing a second value of the signal to a second threshold;

    determining whether to stop the timing period based at least in part on comparing the second value of the signal to the second threshold;

    if the timing period is stopped;

    determining whether a duration of the timing period is within a pre-determined range of timing period values;

    processing the signal if the duration of the timing period is within the pre-determined range of timing period values; and

    receiving a second signal at the stylus if the duration of the timing period is not within the pre-determined range of timing period values;

    if the timing period is not stopped, receiving a second signal at the stylus if the duration of the timing period meets or exceeds a pre-determined time-out length.

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