Patent ID: 7009516
Filing Date: 2006-03-07
Classification: G08B

Abstract:
1. An electronic sensor system for monitoring activity of an object comprising: a central electronic unit means; at least one transponder means being interactive with said central electronic unit means; wherein said central electronic unit means exchanges encoded activity information through radio frequencies with the transponder means; and wherein said transponder means is associated with the object; and an alarm means being interactive with said central electronic unit means, wherein said central electronic unit directs said alarm means to emit an alarm upon receipt of selected encoded activity information from the transponder means; wherein said transponder means has a stand-by mode and an active phase mode, said transponder means being selectively set in stand-by mode during operation of the system, and said central electronic unit means selectively corresponding with the transponder means and controlling said stand-by mode and said active phase mode of said transponder means; a calibration means interactive with said central electronic unit means, said calibration means for monitoring activity of the transponder means within the defined volume and recording activity status of the transponder means in a memory of said central electronic unit means among a set of transponders referenced in said memory; a protection means interactive with said central electronic unit means for querying successively in a loop the transponder means in said memory and for transmitting an activation signal to said alarm means if activity status of a transponder means is reported outside of pre-determined parameters; a detection means interactive with said central electronic unit means for successively querying the transponder means in a loop and for triggering said alarm means at an instant when a transponder means responds with activity information outside of pre-determined parameters; and an initialization means interactive with said central electronic unit means for introducing additional transponders during a time period at a beginning of the querying of the transponder means, said initialization means for referencing the additional transponders into said memory, the identified transponder means being in said stand-by mode during said time period.