Loudspeaker broadcasting system and loudspeaker broadcasting...

Details Loudspeaker broadcasting system and loudspeaker broadcasting... Loudspeaker broadcasting system and loudspeaker broadcasting...

2006-10-24

2006-10-24

Pendleton, Brian T. (Department: 2615)

Electrical audio signal processing systems and devices

Monitoring of sound

C340S692000, C340S577000, C340S628000

Reexamination Certificate

active

07127070

ABSTRACT:
To provide a loudspeaker broadcasting system and a loudspeaker broadcasting apparatus which can perform a loudspeaker broadcasting of appropriate contents at each block without reducing sound clearness. Bi-directional speakers1which performs sound-reinforcement having high intelligibility, and fire detecting sensors3which detect fire occurrence in a tunnel10a, 10band send fire occurrence signals are placed in the tunnel10a, 10bin the tunnel extending direction. In an emergency such as a fire, emergency broadcasting is performed through each bi-directional speaker1at each of the predetermined blocks5in the tunnel10a, 10b. The emergency broadcasting is different in contents at each block, and it is alternately performed at the adjacent blocks5. Further, the frequency components having a long reverberation time is removed from the loudspeaker broadcasting through the bi-directional speaker1.

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