Electronic surveillance system

Details Electronic surveillance system Electronic surveillance system

1993-12-03

1996-06-25

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

342192, G08B 1318

Patent

active

055304290

ABSTRACT:
An electronic surveillance system for detecting unauthorized persons within a building. The system comprising a microwave transmitting/receiving device which transmits a microwave signal into the area under surveillance and receives microwave signals reflected from the area. The microwave signal having frequencies corresponding to the life functions of any living beings present in the area. The transmitting/receiving device comprising a signal conditioning device, a memory device, and a comparator unit. The signal conditioning device adjusts the amplitude and phase of a portion of the outgoing microwave signal and adds it to the incoming microwave signal, eliminating the carrier wave. The resultant actual signal is transmitted to the comparator unit which also receives a signal from the memory device comprising characteristic frequencies representing authorized occupants. If the results of the comparison are above a predetermined threshold, an alarm is generated.

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European patent search for parent European patent application EP 93 25 0331, Apr. 19, 1994.

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