G - Physics – 08 – B
Patent
G - Physics
08
B
349/30
G08B 29/00 (2006.01) G01S 7/52 (2006.01) G08B 29/14 (2006.01)
Patent
CA 1234211
Abstract Method and Circuitry for the Function Control of Ultrasonic Alarm Systems In an ultrasonic alarm system, in which ultrasonic waves are continuously radiated within a surveilled area (R) and a frequency shift caused by a moved object, e.g. an intruder, is by virtue of the Doppler-Effect determined to be cause for the giving of an alarm, the function control of the system is effected during a test phase by means of brief aperiodic modulation of the ultrasonic waves. The resulting brief broadening of the frequency produces in the same east circuit a signal (S2) if the system is functioning normally. The duration of the modulation is chosen to be short enough so that no standing waves can form; this ensures the trouble-free operation of the function control, even if the system, as a result of the vectorial addition of the received ultrasonic waves, accidentally experiences a lack of insensitivity; in this manner even the covering of the transmitter during a sabotage attempt can be identified and differentiated from a state of insensitivity.
474099
Genaehr Rudolf
Siegwart David
Steiner Peter
Cerberus Ag
Perley-Robertson Hill & Mcdougall Llp
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