US 2018/0003855 A1 · WRIST-DETECTION ALGORITHM

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.

Claims20

Dependent claims

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.

4 more elements

Dependencies are inferred from the claim text.

Wrist-detection algorithm

Life of this patent

Wrist-detection algorithm

Life of this patent

Abstract

Claims20