Patent Document ID: 9489600
Application ID: 13266094
Patent Status: 1

Claim One:
1. A method for determining activity of a user having a mobile element coupled thereto, the mobile element comprising at least one motion sensor comprising an accelerometer having at least two measurement axes, the method comprising: using the mobile element to measure movement of the user along the at least two axes to generate a corresponding signal S(n) by the motion sensor at discrete times from zero to N when the mobile element is in a state E(n) characterizing a posture of the user; filtering the signal S(n) to obtain a first component y(n) of high-frequency portions of the signal S(n), said high frequency portions being above a first frequency threshold on each axis of the motion sensor, and a second component x(n) of low frequency portions of the signal S(n), said low frequency portions being below a second frequency threshold lower than the first frequency threshold on at least one axis of the motion sensor; calculating by a processor a combination θ(n) of a norm of the first component and a contribution of the second component; determining by the processor a list of the most likely states E(k i ) characterizing the postures of the user during a period between time zero and N from a calculation of: a probability function of obtaining θ(n) from the signal S(n) when the mobile element is in the E(n) state; a probability function of a transition from the E(n−1) state to the E(n) state; and probability functions of each state of the mobile element at time zero; and outputting a most likely activity of the user as a sequence of most likely postures.