Alarm system
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United States of America Patent
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Jul 29, 1997
Grant Date -
N/A
app pub date -
Dec 15, 1995
filing date -
Dec 15, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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