Human activity monitoring device

  • US 8,712,723 B1
  • Filed: 01/31/2011
  • Issued: 04/29/2014
  • Est. Priority Date: 12/22/2006
  • Status: Active Grant
First 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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