Centralized monitor and alarm system for monitoring remote areas

Details Centralized monitor and alarm system for monitoring remote areas Centralized monitor and alarm system for monitoring remote areas

1972-08-30

1976-08-10

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340258D, 340409, G08B 1300

Patent

active

039744892

ABSTRACT:
A centralized system for simultaneously monitoring a plurality of predetermined remote areas and selectively indicating an unauthorized intrusion into any of the areas. A preamplifier is placed in each of the areas for amplifying the electrical signals from each of a set of microphones in that area and the amplified signal is coupled to a central monitoring and alarm station. The central station may provide a sound level indicating lamp for each area, an alarm lamp to indicate when the sound in each area exceeds a predetermined background or threshold level, and a system for simultaneously listening to the actual sound in all of the remote areas or selectively listening to the sound in any one of the areas.

REFERENCES:
patent: 2436047 (1948-02-01), Martin
patent: 2709251 (1955-05-01), Schmidt
patent: 3437759 (1969-04-01), McKinzie
patent: 3503062 (1970-03-01), Witzke et al.
patent: 3513465 (1970-05-01), Titherington
patent: 3553669 (1971-01-01), Merchant et al.
patent: 3705401 (1972-12-01), Scott

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