| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an automatic fire alarm system by which personnel of a disaster prevention center can check conditions of a scene with minimum power consumption even when power failure occurs and no communication infrastructure functions.SOLUTION: A sound collecting unit for collecting sound around a fire sensor when power failure and fire occur is provided with a fire sensor. A loudspeaker unit for outputting an acoustic signal from the sound collecting unit as sound is also provided with a fire receiver, allowing personnel of a disaster prevention center to hear the sound. A loudspeaker unit is provided in the fire sensor for outputting a speech signal from the fire receiver to surroundings of the fire sensor when power failure and fire occur.</p> |
