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Method and apparatus for off-body detection for wearable device

  • US 10,181,021 B2
  • Filed: 02/01/2016
  • Issued: 01/15/2019
  • Est. Priority Date: 02/01/2016
  • Status: Active Grant
First Claim
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1. A method of operating a wearable device, the wearable device comprising one or more biometric sensors including a capacitive sensor, the method comprising:

  • attenuating, via a filter, defined frequencies in an output signal of the capacitive sensor;

    determining, based at least on the output signal, a capacitance value indicative of a distance of the wearable device to a user, the capacitive sensor comprising a capacitive sensor electrode and being configured to generate the capacitance value based on the distance between the capacitive sensor electrode and the user;

    determining a change in the capacitance value within a defined time interval, the change being greater than or equal to a threshold change indicative of the wearable device not being proximate to the user'"'"'s skin;

    determining that the wearable device has been removed from the user in response to detecting that the change in the capacitance value within the defined time interval is greater than or equal to the threshold change; and

    de-authenticating the user from the wearable device in response to determining that the wearable device has been removed from the user.

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