Broadcast apparatus for closed space
AssigneeKabushiki Kaisha Toshiba
InventorsMasaru Mitsuhashi, Hideki Nagao
Life of this patent
Estimating the term…
Abstract
When a tunnel has no problem therein, a reception wave of a broadcast is retransmitted into the tunnel. At this moment, terminal registers prevent a retransmission signal from leaking from the tunnel and do not influence an adverse effect to a broadcast wave outside the tunnel. When an accident occurs in the tunnel, sensors sense this fact, and a monitoring center issues an emergency operation instruction to broadcast equipment for an emergency. At this moment, the broadcast equipment stops the retransmission of the reception wave to broadcast emergency alarm information into the tunnel and also controls transmitting antennas to emit broadcast signals to broadcast the alarm information also nearby tunnel mouths.
Claims4
A broadcast apparatus for a closed space, comprising:
- reception means for receiving a normal broadcast signal;
- broadcast equipment for emergency which generates emergency information to transmit it as an emergency broadcast signal;
- and
- transmission means for retransmitting the normal broadcast signal received by the reception means to transmit the emergency broadcast signal transmitted from the broadcast equipment for the emergency, instead of the normal broadcast signal in an emergency.
Dependencies are inferred from the claim text.