| 摘要 |
PROBLEM TO BE SOLVED: To provide a broadcasting system capable of easily preventing inhabitants from failing in catching or comprehending important announcement.SOLUTION: Before beginning simultaneous broadcasting to sub-station devices 200, a key station device 100 transmits a simultaneous radio call signal regarding the broadcasting. A house-to-house alarm device 300 installed in each house receives the simultaneous radio call signal transmitted from the key station device 100. Receiving the simultaneous radio call signal, the house-to-house alarm devices 300 outputs a predetermined notification. |
