| 摘要 |
PROBLEM TO BE SOLVED: To enable a loudspeaker inspection system for sound radiation facilities, having a plurality of dispersed loudspeakers to inspect the loudspeakers with simple arrangement, without using filters, etc. SOLUTION: A warning device 1-1 and the plurality of loudspeakers 1-3 and 1-4 are connected by a cable 1-2 for sound emination and a return line 1-5 and a tone signal from a sound generator 1-11 or a transmitter 1-12 of the warning device 1-1 is eminated by the loudspeakers 1-3 and 1-4, and a loudspeaker; and eminated tone signals are extracted by a transformer tertiary coil Tr3 and returned to the warning device 1-1 via the return line 1-5 by contacts of relays 1-31, 1-41, and 1-42 having timers operating at different timings, loudspeaker by loudspeaker. The warning device 1-1 is equipped with a switch SW1, which feeds a DC current driving the relays with the timers to the return line 1-5 and a detector 1-15, which detects whether there is a tone signal sent back from the return line 1-5.
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