H - Electricity – 04 – B
Patent
H - Electricity
04
B
349/30
H04B 11/00 (2006.01) G08B 1/08 (2006.01) G08B 21/02 (2006.01)
Patent
CA 1132678
ABSTRACT Police alerting systems are known to be activated by a switch, a push-button or a pedal. In this invention the activator is in the form of a ring-transmitter that can be squeezed readily to activate the alarm by ultrasonic sound waves. The ring will consist of an ultrasonic transmitter in a casing welded on an incomplete ring, inside the casing consisting of a power source, a time delay, an oscillator, a timer, and a ultrasonic sound generator, the tips of the incomplete ring being soldered to two silver plates, one on the tip, forming a normally open contact, an all-around clearance to permit the ring to be squeezed to short the normally open contact and to permit current flow from the power source through the time delay, energizing the timer which in turn will turn on the oscillator for a short time, the oscillator energizing the ultrasonic sound generator which will generate ultrasonic sound waves, the ultrasonic sound waves upon reaching a receiver including a transducer which will be turned into corresponding electrical impulses, the impulses being filtered by the band-pass filter to eliminate surrounding interference, and to make sure that only the chosen frequency can activate an alarm.
364327
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