Title: Centralized monitor and alarm system for monitoring remote areas with acoustical electric transducers

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.

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Inventors: Bleeker, George H. (Chicago, IL, US)
Geis, David G. (Chicago, IL, US)

Application Number: 284743
Filing Date: 1972-08-30
Publication_date: 1976-08-10
Assignee:
Primary Class(es): 340/514 340/502, 340/511, 340/517, 340/566
Other Classes:
US Patent Ref:

2436047	Feb, 1948	Martin	340/261.
2709251	May, 1955	Schmidt	340/261.
3437759	Apr, 1969	McKinzie	340/261.
3503062	Mar, 1970	Witzke et al.	340/331.
3513465	May, 1970	Titherington	340/261.
3553669	Jan, 1971	Merchant et al.	340/261.
3705401	Dec, 1972	Scott	340/261.

Other Refs:
Primary Examiner: Swann, III, Glen R.
Assistant Examiner:
Attorney: Fitch, Even, Tabin & Luedeka