Alarm apparatus
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United States of America Patent
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-
Dec 12, 1989
Grant Date -
N/A
app pub date -
Mar 3, 1988
filing date -
Mar 31, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An alarm apparatus includes a plurality of sensors connected in parallel with each other between sensor lines extending from a receiver and sounding devices connected between the sensor lines in correspondence to at least one of the sensors. The receiver includes a unit for changing a voltage supply condition of the sensor lines. A control circuit is provided to each audio device so as to selectively control the audio devices when the voltage supply condition is changed, so that a audio device corresponding to an activated sensor, or all of the audio devices, can be arbitrarily controlled to generate audio alarm signals.
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