Wrist-detection algorithm
First Claim
1. A device comprising:
- a sensor comprising a light emitter and a light detector configured to generate signal samples, wherein each signal sample includes a first signal generated when the light emitter is on and a second signal generated when the light emitter is off; and
processing circuitry coupled to the sensor capable of;
performing one or more variance calculations for each signal sample, the one or more variance calculations for each signal sample indicative of a first condition or a second condition;
in accordance with a threshold number of signal samples within a threshold period of time indicating the first condition, determining that the device is not secured to an object; and
in accordance with fewer than the threshold number of signal samples within the threshold period of time indicating the first condition, determining that the device is secured to the object.
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Accused Products
Abstract
Algorithms for detecting whether a device is properly secured to a user'"'"'s skin are described. The operation of a device, such as a wearable device, can be adjusted based on whether the device is properly secured to a user'"'"'s skin (e.g., on-wrist) or not properly secured to the user'"'"'s skin (e.g., off-wrist). For example, certain functions can be disabled for power-saving, security or other purposes if the device is off-wrist. In order to avoid falsely identifying the device as off-wrist or on-wrist, algorithms for detecting whether the device is on-wrist or off-wrist can calculate one or more variances based on signals measured by a light sensor and compare the one or more variances with one or more thresholds. Comparing the one or more variances to the one or more threshold can improve the accuracy of wrist-detection algorithms.
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Citations
20 Claims
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1. A device comprising:
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a sensor comprising a light emitter and a light detector configured to generate signal samples, wherein each signal sample includes a first signal generated when the light emitter is on and a second signal generated when the light emitter is off; and processing circuitry coupled to the sensor capable of; performing one or more variance calculations for each signal sample, the one or more variance calculations for each signal sample indicative of a first condition or a second condition; in accordance with a threshold number of signal samples within a threshold period of time indicating the first condition, determining that the device is not secured to an object; and in accordance with fewer than the threshold number of signal samples within the threshold period of time indicating the first condition, determining that the device is secured to the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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generating a plurality of signal samples, wherein each signal sample includes a first signal generated when a light emitter is on and a second signal generated when the light emitter is off; performing one or more variance calculations for each signal sample, the one or more variance calculations for each signal sample indicative of a first condition or a second condition; in accordance with a threshold number of signal samples within a threshold period of time indicating the first condition, determining that a device is not secured to an object; and in accordance with fewer than the threshold number of signal samples within the threshold period of time indicating the first condition, determining that the device is secured to the object. - View Dependent Claims (10, 11, 12)
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13. A non-transitory computer readable storage medium, the computer readable medium containing instructions that, when executed by an electronic device including a processor and a sensor comprising a light emitter and a light detector, performs a method comprising:
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generating a plurality of signal samples, wherein each signal sample includes a first signal generated when the light emitter is on and a second signal generated when the light emitter is off; performing one or more variance calculations for each signal sample, the one or more variance calculations for each signal sample indicative of a first condition or a second condition; in accordance with a threshold number of signal samples within a threshold period of time indicating the first condition, determining that the device is not secured to an object; and in accordance with fewer than the threshold number of signal samples within the threshold period of time indicating the first condition, determining that the device is secured to the object. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification