Human activity monitoring device
DC CAFCFirst Claim
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1. A method of monitoring human activity using an inertial sensor, comprising:
- assigning a dominant axis with respect to gravity based on an orientation of the inertial sensor;
detecting a change in the orientation of the inertial sensor and updating the dominant axis based on the change; and
counting periodic human motions by monitoring accelerations relative to the dominant axis by counting the periodic human motions when accelerations showing a motion cycle that meets motion criteria is detected within a cadence window; and
updating the cadence window as actual cadence changes.
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Abstract
A method for monitoring human activity using an inertial sensor includes continuously determining an orientation of the inertial sensor, assigning a dominant axis, updating the dominant axis as the orientation of the inertial sensor changes, and counting periodic human motions by monitoring accelerations relative to the dominant axis.
184 Citations
19 Claims
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1. A method of monitoring human activity using an inertial sensor, comprising:
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assigning a dominant axis with respect to gravity based on an orientation of the inertial sensor; detecting a change in the orientation of the inertial sensor and updating the dominant axis based on the change; and counting periodic human motions by monitoring accelerations relative to the dominant axis by counting the periodic human motions when accelerations showing a motion cycle that meets motion criteria is detected within a cadence window; and updating the cadence window as actual cadence changes. - View Dependent Claims (2, 3, 4)
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5. A method of monitoring human activity using an inertial sensor, comprising:
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buffering a plurality of periodic human motions, each periodic human motion comprising a motion cycle; identifying a number of periodic human motions within an appropriate cadence window; counting each of the periodic human motions to enable the monitoring of human activity; and updating the cadence window as a cadence of the motion cycle changes. - View Dependent Claims (6, 7, 8, 9)
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10. An inertial sensor based device, comprising:
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a dominant axis logic to determine an orientation of a device with respect to gravity, to assign a dominant axis, and to update the dominant axis when the orientation of the device changes; and a counting logic to count periodic human motions by monitoring accelerations relative to the dominant axis by counting the periodic human motions when accelerations showing a motion cycle that meets motion criteria is detected within a cadence window; and a cadence logic to update the cadence window as actual cadence changes. - View Dependent Claims (11, 12, 13)
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14. A non-transitory machine readable medium containing executable computer program instructions which, when executed by a processing system, cause said system to perform a method for:
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assigning a dominant axis with respect to gravity based on an orientation of the inertial sensor; detecting a change in the orientation of the inertial sensor and update the dominant axis based on the change; and counting periodic human motions by monitoring accelerations relative to the dominant axis by counting the periodic human motions when accelerations showing a motion cycle that meets motion criteria is detected within a cadence window; and updating the cadence window as actual cadence changes. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification