Patent ID: 7755493

Claim:
A method for remotely tracking a person's activity in a building, comprising the steps of: (i) obtaining, from a detection device configured to detect in said building's electrical power supply system at least one predefined electrical signal produced by a piece of electrical equipment of said building when a change of electrical operating state occurs in said piece of electrical equipment, tracking data relating to at least one detected electrical signal, said tracking data including: (a) information relating to a detection moment of said at least one detected electrical signal, (b) identification data derived from said at least one detected electrical signal of said piece of electrical equipment which produced said at least one detected electrical signal, the detected electrical signal comprising an identifying signature of said piece of electrical equipment that produced said at least one electrical signal, and (c) data relating to said change of electrical operating state which caused said at least one detected electrical signal which comprises the identifying signature of said piece of electrical equipment that produced said at least one electrical signal; and (ii) determining, from the tracking data generated during a predefined period of time, an estimate of said person's degree of activity; wherein said at least one electrical signal is a high frequency electrical signal representative of the electrical equipment and a nature of an action that triggered the signal.