Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1995-10-20
1997-03-04
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
With particular system function
340565, 340566, 340429, 340690, 367197, G08B 2900
Patent
active
056083777
ABSTRACT:
A method of supervising the operation of an intrusion detector having a housing, the method including periodically generating in the housing at least one sound wave signal, sensing an acoustic image formed in the housing in response to the at least one sound wave signal, constructing a sensed signal envelope responsive to the sensed acoustic image, periodically comparing the sensed signal envelope with a reference signal envelope to determine whether a predetermined criterion of similarity between the sensed signal envelope and the reference signal envelope is met and, if the similarity criterion is not met, providing a predetermined, sensible, indication.
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Moldavsky Mark
Zhevlev Boris
Hofsass Jeffery
Pope Daryl C.
Visonic Ltd.
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