Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1976-12-08
1978-10-31
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340310A, 340538, 343 5PD, G08B 1316
Patent
active
041237480
ABSTRACT:
Burglar alarms utilizing ultrasonic waves in which ultrasonic waves transmitted from a wave transmitting oscillator are reflected by such objects as doors, windows, floors, walls, etc. and such reflected ultrasonic waves will be received by a wave receiving oscillator. Then, when those received ultrasonic waves are disturbed by an illegal intruder, a change in signal will be detected and become an input signal for actuating alarms. Remote units each consisting of an amplifier, wave transmitting oscillator, wave receiving oscillator, etc. will be installed directed at doors, windows, etc., and such remote units are connected to a main unit consisting of a high-frequency voltage generator installed in an watching room or a control room. In this case, the generation of beating between the main unit and each remote unit when sending signals from the main unit in each power source line is prevented by means of filters as is the generation of beating between the remote units is prevented, is simplified, and the intrusion of electrical noise is prevented by means of an impedance transducer.
REFERENCES:
patent: 3680074 (1972-07-01), Lieser
patent: 3781859 (1973-12-01), Hermans
patent: 3986182 (1976-10-01), Hackett
Nippon Prosensor Co., Ltd.
Swann III Glen R.
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