ALARM BROADCASTING SYSTEM

摘要

The present invention relates to an alarm broadcasting system. The alarm broadcasting system includes: a transmitter which wirelessly transmits an alarm signal; a receiver which wirelessly receives the alarm signal transmitted from the transmitter; a speaker which generates alarm according to the received alarm signal; a power supply part which supplies power to a speaker through a power cable; a battery which selectively supplies power to the speaker; and a first disconnection detection part which detects the disconnection of the power cable. The first disconnection detection part generates a first control signal to supply power from the battery to the speaker when the disconnection of the power cable occurs.