Method and apparatus for off-body detection for wearable device
First Claim
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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Abstract
A method and apparatus for capacitive off-wrist detection for wearable device are disclosed. In one aspect, the wearable device includes one or more biometric sensors including a capacitive sensor. The method may involve measuring, based on output of the capacitive sensor, a capacitance value indicative of proximity of the wearable device to a user. The method may also involve detecting 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. The method may further involve 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.
42 Citations
28 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 27)
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24. A wearable device, comprising:
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a capacitive sensor configured to generate an output signal 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 output signal based on the distance between the capacitive sensor electrode and the user; a filter; at least one processor; and a memory storing computer-executable instructions for controlling the at least one processor to; attenuate, via the filter, defined frequencies in the output signal of the capacitive sensor; determine, based at least on the output signal, a capacitive value indicative of the distance of the wearable device to the user; determine that a change in the capacitance value within a defined time interval is greater than or equal to a threshold change indicative of the wearable device not being proximate to the user'"'"'s skin; determine 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-authenticate the user from the wearable device in response to determining that the wearable device has been removed from the user. - View Dependent Claims (25, 26, 28)
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Specification