Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-10-23
1998-04-28
Hofsass, Jeffey
Communications: electrical
Condition responsive indicating system
Specific condition
340584, 340691, 340693, 367199, 381 56, G08B 1710
Patent
active
057450404
ABSTRACT:
An outdoor alerting device for smoke alarms including an alarm detecting and alerting device drive unit and an exterior alerting device including a loudspeaker installed within a housing and a light display unit attached to the housing and having a light bulb. The alarm detecting and alerting device drive unit includes an alarm detection circuit including a microphone having a microphone output in electrical connection with an amplifier circuit for converting the audible alarm into an amplified electrical microphone signal. The amplified electrical microphone signal is then passed through a band pass filter that is tuned to the main audible output frequency of the audible alarm of the smoke detector to produce a filtered microphone signal. The filtered microphone signal is the passed through a rectifier circuit to convert the filtered microphone signal into a DC microphone signal. The DC microphone signal is then output to the signal input of a comparator. The reference input of the comparator is supplied with a predetermined reference voltage such as through a voltage divider circuit. The output of the comparator is used to trigger the exterior alerting device after being passed through a delay network.
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Breaux Joseph N.
Hofsass Jeffey
Wu Daniel J.
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