Patent Document ID: 20120101785
Application ID: 13266100
Patent Flag: 0

Claim One:
1. A system for determining the activity of a person lying down, comprising at least two processing pathways of signals at the output of at least one motion sensor substantially affixed to said person, wherein a first of said at least two processing pathways processes a first component comprising signals of low frequencies and a second processing pathway processes a second component of signals of high frequencies, said system further comprising: first calculation means for calculating a first variable (x(n)) representing a temporal variation of said first component, for at least an axis of said motion sensor; second calculation means for calculating a second variable (y(n)) comprising the Euclidean noun, along at least one measurement axis, of said second component; and analysis means configured for determining an activity of said person as a function of time using a hidden Markov model having N states corresponding to N activities respectively, said analysis means being configured for combining: conjoint probability density functions of said first and second variables, said probability density functions being defined for each state of the model in question; and probabilities of transitions between at least two successive states.