Alarm system

Details Alarm system Alarm system

1995-12-15

1997-07-29

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340508, 340514, 340692, 367199, 381 58, 381 59, 381 85, G08B 2900, H04R 2900

Patent

active

056525664

ABSTRACT:
A redundant alarm system including a central controller that interfaces with a first alarm, a second alarm, a visual indicator and an acoustic sensor. When an alarm condition exists, the controller activates the primary alarm causing the primary alarm to generate an audible first alarm signal. The audible first alarm signal is transmitted from the primary alarm to the acoustical sensor. The acoustical sensor detects the audible first alarm signal and transduces the audible first alarm signal into a first feedback signal that is relayed to the controller. If the controller does not receive the first feedback signal from the acoustical sensor within a predetermined time after activating the primary alarm, the controller activates the secondary alarm and the visual indicator.

REFERENCES:
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patent: 3893092 (1975-07-01), Kessler
patent: 3989908 (1976-11-01), Budrys et al.
patent: 4012728 (1977-03-01), Fowler
patent: 4037222 (1977-07-01), Solomon
patent: 4241335 (1980-12-01), Barnes
patent: 4803465 (1989-02-01), Prysby
patent: 5103206 (1992-04-01), Yu
patent: 5345510 (1994-09-01), Singhi et al.
patent: 5361305 (1994-11-01), Easley et al.
patent: 5574437 (1996-11-01), Schwinn et al.

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