Automatically supervised alarm system

Details Automatically supervised alarm system Automatically supervised alarm system

1978-06-26

1980-12-23

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340527, 340511, G08B 1322

Patent

active

042413354

ABSTRACT:
An alarm system including an alarm which is actuated when a sensor such as a microphone detects an emergency condition. In one embodiment the output of the microphone is fed through a filter circuit tuned to frequencies characteristic of breaking glass. In conventional systems failure of the microphone may remain undetected but in the system of the present invention an alarm is instituted when the sensor detects any emergency signals and when the sensor fails to detect a reference signal. The reference signal is produced at regular intervals but the alarm instituting means includes a delay and is operable to switch off the reference signal within the delay period to avoid false alarms.

REFERENCES:
patent: 2779936 (1957-01-01), Loudon et al.

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