JP2853196B2 - Municipal disaster prevention radio system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention aims to further improve the accuracy of information transmission by reliably turning on and off a display of a rebroadcast notice for a fixed-door receiver of a municipal emergency management radio system. A rebroadcast indicator for displaying a rebroadcast notice, rebroadcast display lighting means for lighting the rebroadcast indicator when a rebroadcast notice signal is received from the master station, and a rebroadcast end signal from the master station. And a rebroadcasting display extinguishing means for extinguishing the rebroadcasting display when receiving the broadcast message.

[Industrial applications]

The present invention relates to a municipal emergency management radio system fixed system.

The municipal disaster prevention administrative radio system fixed system is composed of a master station installed in the city hall, town hall or village office, an outdoor receiver installed outdoors, and a door-to-door receiver provided in each home, and transmits information related to disaster. Its main purpose is to quickly communicate to the people in the area.

[Conventional technology]

As described above, the door-to-door receiver is installed in each home, but a person who is absent during daytime broadcasting cannot hear the broadcasting. Therefore, conventionally, a retransmission switch is provided in a door-to-door receiver, and a rebroadcast reception function capable of receiving a rebroadcast from the master station if the switch is turned on is added.

However, since the door-to-door receiver does not have a function to indicate whether rebroadcasting will be performed, the resending switch may be kept off, or even if the resending switch is turned on, the door-to-door replaying time will be There was a problem that the function did not work effectively, such as being in a different room from the room where the receiver was installed and forgetting to listen to the rebroadcast.

Japanese Patent Application Laid-Open No. 61-99422 discloses a configuration in which a display unit that performs display according to the type of received broadcast content is provided, for example, when the emergency broadcast display is turned on, it is determined that rebroadcasting is likely to be performed. Is disclosed.

[Problems to be solved by the invention]

In the above-described configuration, there is a slight problem in reliability only because the possibility of rebroadcasting is high.

Further, as for the function of turning off the display, only a method of manually resetting or turning off the light after displaying for a certain time by a timer is described.

Accordingly, it is an object of the present invention to further improve the accuracy of information transmission by reliably turning on and off the display of a rebroadcast notice.

[Means for solving the problem]

FIG. 1 is a diagram showing a principle configuration of a door-to-door receiver included in a municipal emergency management radio system according to the present invention.

The receiving unit 10 tunes to a specific frequency in radio waves received by the antenna, amplifies, detects, and outputs the amplified signal. The output is amplified by the amplifier 18 to drive a speaker. The rebroadcast display lighting means 12 turns on the rebroadcast display 16 when detecting the rebroadcast advance notice signal from the output of the receiving unit 10. The rebroadcast display extinguishing means 14 turns off the rebroadcast display 16 when detecting the rebroadcast end signal from the output of the receiving unit 10. The rebroadcast announcement signal is added to the selective call signal of the first broadcast or transmitted alone when it is decided to perform the rebroadcast at the master station. The rebroadcast end signal is added to the selective call signal at the time of the rebroadcast or transmitted independently.

(Operation)

The rebroadcast indicator 16 is assured by the signal sent from the master station.
Is turned on / off.

〔Example〕

FIG. 2 is a diagram showing an example of the format of a frame transmitted from a master station to a slave station, including a rebroadcast notice signal (column (1)) or a rerun end signal (column (2)).

Among them, the frame synchronization signal a, the bit synchronization signal b,
Since the selective calling signal c, the speaker open signal e, the broadcast signal f, and the end signal g are included in the transmission frame in a general system of this type, detailed description will be omitted.
Of these, the broadcast signal f is transmitted as an analog audible signal, but the rest is a digital signal. Therefore, it is preferable that the rebroadcast advance signal d or the rebroadcast end signal d 'be interrupted in the form of a digital signal in the area of the digital signal, for example, after the selective calling signal c as shown in FIG. As described above, these can be transmitted alone.

FIG. 3 is a block diagram showing an example of a door-to-door receiver configured based on the present invention.

The receiving unit 100 tunes to a signal of a specific frequency in radio waves received by the antenna, amplifies, detects, and outputs the signal. The switch 102 is turned on only during a period when the detected signal is an audible analog signal (FIG. 2f), and the audible signal passing through the switch 102 is amplified by the amplifier 180 to sound a speaker. The microcomputer 120 decodes the digital signal included in the detected signal, and when it is determined that the frame is transmitted to itself, changes the speaker open signal (FIG. 2e) to the end signal (FIG. 2g). ), The switch 102 is turned on.

The configuration described so far is also provided in a conventional door-to-door receiver. The microcomputer 120 also extracts a rebroadcast advance notice signal (FIG. 2d) and a rebroadcast end signal (FIG. 2d ') from the received frames, and in the former case, turns on the LED 160. A signal is transmitted, and in the latter case, a signal for turning off the LED 160 is transmitted.

〔The invention's effect〕

As described above, according to the present invention, when there is a rebroadcast, the lamp of the door-to-door receiver is turned on, so that it is less likely to forget to turn on the retransmission switch while keeping it off. Also, if the start time of the rebroadcast is determined in advance, it is less likely that the user will miss a broadcast in a different place from the room where the door-to-door receiver is installed during the rebroadcast.
Further, when the rebroadcast is over and the rebroadcast end signal is received, the lamp is automatically turned off, so that the operation is simple (the lamp does not need to be turned off manually), and the end of the rebroadcast can be confirmed. .

As described above, according to the present invention, the rebroadcast reception function is sufficiently utilized, and a more reliable municipal disaster management radio system can be constructed.

[Brief description of the drawings]

 FIG. 1 is a diagram showing the principle configuration of the present invention, FIG. 2 is a diagram showing an example of a transmission frame, and FIG. 3 is a diagram showing an embodiment of the present invention. In the figure, 18,180 ... amplifier, 102 ... switch, 160 ... LED.

Claims (1)

(57) [Claims] 1. A municipal disaster prevention radio system comprising a master station and a door-to-door receiver, wherein the master station sends a rebroadcast advance notice signal when rebroadcast is scheduled, and a rebroadcast notice signal when rebroadcast ends. The rebroadcast end signal is transmitted to the door-to-door receiver.When the door-to-door receiver receives the rebroadcast advance notice signal from the master station, it turns on the display. A municipal emergency radio system that turns off the lights.