Disaster prevention system

Abstract

To allow voice of a counter party to be heard in a wireless manner or by a plurality of persons.SOLUTION: A disaster prevention receiving board 100 is connected to a terminal appliance 200 and a speaker 350 that outputs sound so that a plurality of persons can hear the sound. The disaster prevention receiving board 100 comprises a wireless communication device that communicates with a headset 400 having a speaker 402 in a wireless manner. The disaster prevention receiving board has: a loudspeaker calling function that outputs voice of a counter party from the speaker 350 in response to a voice signal transmitted from the terminal appliance 200; and a wireless calling function that outputs voice from the speaker 402 of the headset 400 in response to the voice signal transmitted from the wireless communication device to the appliance in a wireless manner.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a disaster prevention system.

Background Art

[0002] When performing maintenance on disaster prevention equipment, there is a known technique that enables at least one of the maintenance personnel on the disaster prevention control panel side and the maintenance personnel on the terminal device side to make hands-free calls (see, for example, Patent Documents 1 to 3).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the maintenance personnel on the disaster prevention control panel side makes a call while, for example, performing work, there are cases where they may want to make a wireless call without holding a receiver. However, when always using a headset for calls as in the techniques described in Patent Documents 2 and 3, only the person wearing the headset can hear the voice of the other party, so there is a risk of misrecognition regarding the content being spoken by the other party.

[0005] One of the objectives of the present invention is to enable the voice of the other party to be heard wirelessly and by multiple people.

Means for Solving the Problems

[0006] The present invention relates to a disaster prevention control panel connected to a terminal device and a first speaker that outputs sound so that a plurality of people can hear it, and includes a wireless communication device that wirelessly communicates with a head-mounted device having a second speaker, and outputs the voice of the other party from the first speaker according to the voice signal transmitted from the terminal device. And a second function of outputting the voice from the second speaker according to the voice signal wirelessly transmitted from the wireless communication device to the head-mounted device. A disaster prevention control panel having the above is provided.

[0007] The disaster prevention control panel may further include a switching unit that switches between the first function and the second function.

[0008] The switching unit may switch between the first function and the second function according to the connection status of a maintenance telephone to the disaster prevention control panel.

[0009] The switching unit may switch between the first function and the second function according to the communication status between the head-mounted device and the wireless communication device.

[0010] When the communication between the head-mounted device and the wireless communication device is interrupted, the first speaker may output a warning sound.

[0011] The disaster prevention control panel may further include a display unit that changes the display content to indicate the situation when the communication between the head-mounted device and the wireless communication device is interrupted.

Effects of the Invention

[0012] According to the present invention, it is possible to wirelessly listen to the voice of the other party or listen to it with a plurality of people.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0014] Configuration FIG. 1 is a diagram showing an example of the configuration of a disaster prevention system 10. The disaster prevention system 10 is a system for early detection of a fire and minimizing damage caused by the fire. The disaster prevention system 10 is installed, for example, in a tunnel.

[0015] The disaster prevention system 10 includes a disaster prevention receiver 100, a plurality of terminal devices 200, a maintenance telephone 250, an amplifier 300, a plurality of speakers 350, a headset 400, and a maintenance telephone 500. Note that the disaster prevention system 10 does not necessarily have all the devices shown in FIG. 1 and may be configured without including some of the devices. The disaster prevention receiver 100 is installed, for example, in the electrical room of a tunnel. The terminal devices 200 are installed at locations different from the disaster prevention receiver 100. The disaster prevention receiver 100 and the terminal devices 200 are connected via a telephone line 610 and a signal line 620. The speakers 350 are installed at positions where a plurality of people can hear the output sound. For example, the speakers 350 are installed at the four corners of the ceiling of the room where the disaster prevention receiver 100 is installed. The disaster prevention receiver 100 and the amplifier 300, and the amplifier 300 and the plurality of speakers 350 are connected via signal lines 630 respectively. That is, the disaster prevention receiver 100 and the plurality of speakers 350 are connected via the amplifier 300 and the signal line 630.

[0016] The disaster prevention receiver 100 exchanges signals with the terminal devices 200 and controls the terminal devices 200. For example, when the disaster prevention receiver 100 receives a fire signal indicating the occurrence of a fire from a fire detector or a manual reporting device, it notifies the occurrence of the fire and controls the fire extinguishing equipment and the water spray equipment. In addition, the disaster prevention receiver 100 has a function of communicating with the terminal devices 200. The disaster prevention receiver 100 is an example of the "control panel for disaster prevention" according to the present invention.

[0017] The disaster prevention receiver 100 has a public address function and a wireless communication function. FIG. 2 is a diagram showing an example of the state of a call realized by the public address function. The public address function is a function for making a call using the speaker 350. In the public address function, the voice of the other party is output from the speaker 350. When the public address function is used, a plurality of people at the location where the speaker 350 is installed can hear the voice of the other party. The public address function is an example of the "first function" according to the present invention. FIG. 3 is a diagram showing an example of the state of a call realized by the wireless communication function. The wireless communication function is a function for making a call using the headset 400. In the wireless communication function, the voice of the other party is output from the headset 400. When the wireless communication function is used, only the person wearing the headset 400 can talk to the other party. The wireless communication function is an example of the "second function" according to the present invention.

[0018] Returning to FIG. 1, the terminal device 200 is connected to the disaster prevention receiver 100 and exchanges signals with the disaster prevention receiver 100. The terminal device 200 includes, for example, a pump control panel. Note that the terminal device 200 may include a fire detector, a manual reporting device, a fire extinguishing facility, and a water spray facility. Further, the terminal device 200 has a function of communicating with the disaster prevention receiver 100. Note that not all of the terminal devices 200 need to have a function of communicating with the disaster prevention receiver 100. For example, only some of the terminal devices 200 may have a function of communicating with the disaster prevention receiver 100, and the other terminal devices 200 may not have a function of communicating with the disaster prevention receiver 100.

[0019] The maintenance telephone 250 is a maintenance telephone called an encounter tester. The maintenance telephone 250 is carried by a maintenance staff B who performs maintenance on the terminal device 200 and is used for the maintenance staff B to communicate with the maintenance staff A on the disaster prevention receiver 100 side. The maintenance telephone 250 has a plug 251 and is connected to the terminal device 200 using the plug 251.

[0020] Amplifier 300 amplifies the audio signal. Speaker 350 is used for voice output when the hands-free function is utilized. Speaker 350, also called a loudspeaker, outputs voice so that it can be heard by multiple people according to the audio signal amplified by amplifier 300. Speaker 350 is an example of the "first speaker" according to the present invention.

[0021] When the wireless call function is used, headset 400 is worn on the head of maintenance staff A on the disaster prevention receiver 100 side and is used for maintenance staff A to communicate wirelessly with maintenance staff B on the terminal device 200 side. Headset 400 has a microphone 401 and a speaker 402. Microphone 401 collects voice and converts it into an audio signal. Speaker 402 outputs voice according to the audio signal. Headset 400 is an example of the "head-mounted device" according to the present invention. Speaker 402 is an example of the "second speaker" according to the present invention.

[0022] Similar to maintenance telephone 250, maintenance telephone 500 is a maintenance telephone called a contact tester. Maintenance telephone 500 is used for maintenance staff A on the disaster prevention receiver 100 side to communicate with maintenance staff B on the terminal device 200 side. Maintenance telephone 500 has a plug 501 and is connected to disaster prevention receiver 100 using plug 501.

[0023] Figure 4 is a diagram showing an example of the configurations of disaster prevention receiver 100 and terminal device 200. Note that in Figure 4, mainly the configurations related to calls are shown, and other configurations are omitted. Terminal device 200 includes a socket 201. Disaster prevention receiver 100 includes a first connection detection unit 101, a control unit 102, a speaker 103, a microphone 104, a socket 105, a second connection detection unit 106, a switching unit 107, a wireless communication device 108, and a display unit 109. Note that neither disaster prevention receiver 100 nor terminal device 200 necessarily needs to include all the configurations shown in Figure 4, and may be configured without including some of the configurations.

[0024] The insertion port 201 of the terminal device 200 is the port into which the plug 251 of the maintenance telephone 250 is inserted. The insertion port 201 is, for example, a telephone jack. When performing maintenance on the terminal device 200, the maintenance staff B carries the maintenance telephone 250. When contacting the maintenance staff A on the disaster prevention receiver 100 side, the maintenance staff B inserts the plug 251 of the maintenance telephone 250 into the insertion port 105 of the terminal device 200. Thereby, the terminal device 200 and the maintenance telephone 250 are connected.

[0025] When the plug 251 of the maintenance telephone 250 is inserted into the insertion port 201 of the terminal device 200, the first connection detection unit 101 of the disaster prevention receiver 100 detects that the maintenance telephone 250 is connected to the terminal device 200. As this detection method, for example, there is a method in which when the plug 251 of the maintenance telephone 250 is inserted into the insertion port 201, it is energized and a current flows through the telephone line 610 to the first connection detection unit 101 for detection. The first connection detection unit 101 is realized by, for example, a circuit.

[0026] The control unit 102 controls each part of the disaster prevention receiver 100 to perform various processes. For example, when the first connection detection unit 101 detects that the maintenance telephone 250 is connected to the terminal device 200, the control unit 102 sounds a ringing tone from the speaker 103. In addition, the control unit 102 checks the communication status between the wireless communication device 108 and the headset 400 and performs a warning process according to the communication status. The control unit 102 is realized, for example, by a processor executing a program stored in a memory. The processor includes, for example, a CPU (Central Processing Unit). The memory includes at least one of, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), an HDD (Hard Disk Drive), an SSD (Solid State Drive), and a flash memory.

[0027] The speaker 103 outputs a sound according to an acoustic signal under the control of the control unit 102. For example, the speaker 103 outputs a ringing tone according to a ringing tone signal.

[0028] When the loudspeaker function is used, the microphone 104 is used when at least one person around the disaster prevention receiver 100 talks to the other party. The microphone 104 collects ambient sound and converts it into an audio signal. The microphone 104 supplies the audio signal to the switching unit 107.

[0029] The insertion port 105 is a port into which the plug 501 of the maintenance telephone 500 is inserted. The insertion port 105 is, for example, a telephone jack. When the maintenance staff A makes a call using the maintenance telephone 500, the plug 501 of the maintenance telephone 500 is inserted into the insertion port 105. Thereby, the disaster prevention receiver 100 and the maintenance telephone 500 are connected.

[0030] When the plug 501 of the maintenance telephone 500 is inserted into the insertion port 105, the second connection detection unit 106 detects that the maintenance telephone 500 is connected to the disaster prevention receiver 100. The second connection detection unit 106 is realized by, for example, a circuit.

[0031] The switching unit 107 switches between the loudspeaker function and the wireless communication function. Specifically, the switching unit 107 switches the supply destination of the audio signal received from the terminal device 200 between the amplifier 300 and the wireless communication device 108. Also, the switching unit 107 switches the supply source of the audio signal transmitted to the terminal device 200 between the microphone 104 and the wireless communication device 108. The switching unit 107 is realized, for example, by a switch or a processor executing a program stored in a memory. As a method for switching between the loudspeaker function and the wireless communication function, for example, there are the following methods.

[0032] The first method is a method of switching between the amplified call function and the wireless call function according to the operation of the switch 110. When the first method is used, the switching unit 107 is realized by the switch 110 provided in the disaster prevention receiver 100. The switch 110 receives an operation for switching whether or not to use the amplified call function. For example, as shown in FIG. 1, a door is attached to the front of the disaster prevention receiver 100, and the switch 110 is provided on the surface exposed when the door is opened. When the first method is used, the maintenance telephone 500 may be connected to the disaster prevention receiver 100, or the maintenance telephone 500 may not be provided.

[0033] For example, when the maintenance staff A wants to talk to the other party with multiple people, the maintenance staff A turns on the switch 110 to use the amplified call function. When the switch 110 is turned on, the switching unit 107 switches to the amplified call function. Specifically, when the switch 110 is turned on, the amplifier 300 and the telephone line 610 are connected, and the voice signal received from the terminal device 200 is supplied to the amplifier 300. Also, when the switch 110 is turned on, the microphone 104 and the telephone line 610 are connected, and the voice signal supplied from the microphone 104 is transmitted to the terminal device 200. When the switch 110 is turned on, the connection between the wireless communication device 108 and the telephone line 610 is released, so the voice signal received from the terminal device 200 is not supplied to the wireless communication device 108. Also, even if a voice signal is supplied from the wireless communication device 108, this voice signal is not transmitted to the terminal device 200.

[0034] On the one hand, when the maintenance staff A wants to talk to the other party using, for example, the headset 400, in order to use the wireless call function, the switch 110 is turned off. When the switch 110 is turned off, the switching unit 107 switches to the wireless call function. Specifically, when the switch 110 is turned off, the wireless communication device 108 and the telephone line 610 are connected, and the voice signal received from the terminal device 200 is supplied to the wireless communication device 108. Also, the voice signal supplied from the wireless communication device 108 is transmitted to the terminal device 200. Note that when the switch 110 is turned off, the connection between the amplifier 300 and the telephone line 610 is released, so the voice signal received from the terminal device 200 is not supplied to the amplifier 300. Also, when the switch 110 is turned off, the connection between the microphone 104 and the telephone line 610 is released, so even if a voice signal is supplied from the microphone 104, this voice signal is not transmitted to the terminal device 200.

[0035] As a second method, it is a method of switching between the loudspeaker call function and the wireless call function according to the connection status of the maintenance telephone 500. When the second method is used, the switching unit 107 is realized, for example, by a processor executing a program stored in the memory. Note that when the second method is used, the switch 110 may not be provided.

[0036] When the maintenance staff member A wants to talk to someone with multiple people, for example, in order to use the hands-free call function, the plug 501 of the maintenance telephone 500 is not inserted into the insertion port 105. For example, if the plug 501 of the maintenance telephone 500 is already inserted into the insertion port 105, the maintenance staff member A pulls out the plug 501 from the insertion port 105. When the second connection detection unit 106 does not detect that the maintenance telephone 500 is connected to the disaster prevention receiving board 100, in order to indicate that the plug 501 of the maintenance telephone 500 is not inserted into the insertion port 105, the switching unit 107 switches to the hands-free call function. Specifically, the switching unit 107 supplies the voice signal received from the terminal device 200 to the amplifier 300. Also, the switching unit 107 transmits the voice signal supplied from the microphone 104 to the terminal device 200. Note that when the plug 501 of the maintenance telephone 500 is not inserted into the insertion port 105, the switching unit 107 does not supply the voice signal to the wireless communication device 108. Also, even if a voice signal is supplied from the wireless communication device 108, the switching unit 107 does not transmit this voice signal to the terminal device 200.

[0037] On the other hand, when the maintenance staff member A wants to talk to someone using the headset 400 or the maintenance telephone 500, for example, in order to use the wireless call function, the plug 501 of the maintenance telephone 500 is inserted into the insertion port 105. When the second connection detection unit 106 detects that the maintenance telephone 500 is connected to the disaster prevention receiving board 100, in order to indicate that the plug 501 of the maintenance telephone 500 is inserted into the insertion port 105, the switching unit 107 switches to the wireless call function. Specifically, the switching unit 107 supplies the voice signal received from the terminal device 200 to the wireless communication device 108 and the maintenance telephone 500. Also, the switching unit 107 transmits the voice signal supplied from the wireless communication device 108 and the voice signal supplied from the maintenance telephone 500 to the terminal device 200. Note that when the plug 501 of the maintenance telephone 500 is inserted into the insertion port 105, the switching unit 107 does not supply the voice signal received from the terminal device 200 to the amplifier 300. Also, even if a voice signal is supplied from the microphone 104, the switching unit 107 does not transmit this voice signal to the terminal device 200.

[0038] The third method is a method of switching between the hands-free call function and the wireless call function according to the communication status between the headset 400 and the wireless communication device 108. When the third method is used, the switching unit 107 is realized, for example, by a processor executing a program stored in a memory. When the third method is used, the maintenance telephone 500 may be connected to the disaster prevention receiver 100, or the maintenance telephone 500 may not be provided.

[0039] The communication status between the headset 400 and the wireless communication device 108 includes, for example, the connection status. The switching unit 107 checks the connection status between the headset 400 and the wireless communication device 108 at a predetermined time interval. For example, when the headset 400 moves outside the communication range 180 of the wireless communication device 108, when the power of the headset 400 is turned off, or when the headset 400 fails and stops operating, the connection between the headset 400 and the wireless communication device 108 is released. When the connection between the headset 400 and the wireless communication device 108 is released, to indicate that the headset 400 and the wireless communication device 108 cannot communicate, the switching unit 107 switches to the hands-free call function. Specifically, the switching unit 107 supplies the audio signal received from the terminal device 200 to the amplifier 300. Also, the switching unit 107 transmits the audio signal supplied from the microphone 104 to the terminal device 200. When the connection between the headset 400 and the wireless communication device 108 is released, the switching unit 107 does not supply the audio signal received from the terminal device 200 to the wireless communication device 108. Also, even if an audio signal is supplied from the wireless communication device 108, the switching unit 107 does not transmit this audio signal to the terminal device 200.

[0040] When the headset 400 is connected to the wireless communication device 108, the switching unit 107 switches to the wireless call function to indicate that the headset 400 and the wireless communication device 108 can communicate. Specifically, the switching unit 107 supplies the voice signal received from the terminal device 200 to the wireless communication device 108. Also, the switching unit 107 transmits the voice signal supplied from the wireless communication device 108 to the terminal device 200. When the headset 400 is connected to the wireless communication device 108, the switching unit 107 does not supply the voice signal received from the terminal device 200 to the amplifier 300. Also, even when a voice signal is supplied from the microphone 104, the switching unit 107 does not transmit this voice signal to the terminal device 200.

[0041] The switching between the amplified call function and the wireless call function may be performed during a call. For example, when the first method is used, the maintenance staff A may switch the switch 110 from on to off during the call to switch from the amplified call function to the wireless call function. Similarly, when the second method is used, the maintenance staff A may insert the plug 501 of the maintenance telephone 500 into the insertion port 105 during the call to switch from the amplified call function to the wireless call function. Also, when the third method is used, for example, when the connection between the headset 400 and the wireless communication device 108 is released during the call because the maintenance staff A moves outside the communication range 180 of the wireless communication device 108 while on the call, it may be switched from the wireless call function to the amplified call function.

[0042] When the wireless communication function is used, the wireless communication device 108 communicates wirelessly with the headset 400 in accordance with a wireless communication standard. For example, the wireless communication device 108 transmits the audio signal supplied from the switching unit 107 to the headset 400. Also, the wireless communication device 108 supplies the audio signal supplied from the headset 400 to the switching unit 107. As the wireless communication standard, for example, Bluetooth (registered trademark) is used. However, the wireless communication standard is not limited to Bluetooth (registered trademark), and any wireless communication standard may be used. When Bluetooth (registered trademark) is used, pairing is performed in advance between the wireless communication device 108 and the headset 400. When the pre-paired headset 400 moves within the communication range 180 of the wireless communication device 108, the connection between the wireless communication device 108 and the headset 400 is established. The communication range 180 refers to the range within which the wireless communication device 108 can communicate.

[0043] The display unit 109 displays various types of information under the control of the control unit 102. For example, while the wireless communication device 108 and the headset 400 are connected, as shown in FIG. 3, the display unit 109 displays information 190 indicating that they are connected. This information 190 may be composed of, for example, characters or symbols, or may be composed of graphics or images. The display unit 109 includes at least one of, for example, a liquid crystal display and an organic EL (Electro Luminescence) display.

[0044] Operation Figure 5 is a sequence chart showing an example of the operation when making a call using the loudspeaker function. When maintenance staff B who maintains the terminal device 200 contacts maintenance staff A on the disaster prevention receiver 100 side, the plug 251 of the maintenance telephone 250 is inserted into the insertion port 201 of the terminal device 200. In step S11, when the plug 251 of the maintenance telephone 250 is inserted into the insertion port 201 of the terminal device 200, the terminal device 200 and the maintenance telephone 250 are connected. In step S12, the disaster prevention receiver 100 detects that the maintenance telephone 250 is connected to the terminal device 200 by the first connection detection unit 101. In step S13, the disaster prevention receiver 100 sounds a ringing tone from the speaker 103. When the ringing tone sounds, the person on the disaster prevention receiver 100 side notices that there is an incoming call from the terminal device 200. When the person on the disaster prevention receiver 100 side performs an operation to respond, the ringing tone stops and the call can be made. This operation is, for example, an operation of switching a switch provided on the maintenance telephone 500, or an operation of pressing a response button provided on the headset 400 or the disaster prevention receiver 100.

[0045] When maintenance staff B speaks using the maintenance telephone 250, in step S14, an audio signal indicating the voice of maintenance staff B is input to the terminal device 200. In step S15, the terminal device 200 transmits the input audio signal to the disaster prevention receiver 100 via the telephone line 610. When the loudspeaker function is used, the supply destination of the audio signal received from the terminal device 200 is switched to the amplifier 300 by the switching unit 107. Therefore, in step S16, the disaster prevention receiver 100 transmits the audio signal received from the terminal device 200 to the amplifier 300 via the signal line 630. In step S17, the amplifier 300 amplifies the audio signal received from the disaster prevention receiver 100. In step S18, the amplifier 300 transmits the amplified audio signal to a plurality of speakers 350 via the signal line 630. In step S19, the plurality of speakers 350 output a voice corresponding to the audio signal received from the amplifier 300. As a result, as shown in FIG. 2, the voice of maintenance staff B is output from the plurality of speakers 350.

[0046] Returning to FIG. 5, when at least one person around the disaster prevention receiver 100 speaks, in step S20, this voice is input into the microphone 104 of the disaster prevention receiver 100. When the voice amplification function is used, the source of the voice signal transmitted to the terminal device 200 is switched to the microphone 104 by the switching unit 107. Therefore, in step S21, the disaster prevention receiver 100 transmits a voice signal indicating the voice input into the microphone 104 to the terminal device 200 via the telephone line 610. In step S22, the terminal device 200 supplies the voice signal received from the disaster prevention receiver 100 to the maintenance telephone 250. In step S23, the maintenance telephone 250 outputs a voice corresponding to this voice signal. As a result, the voice of the person on the disaster prevention receiver 100 side is output from the maintenance telephone 250.

[0047] FIG. 6 is a sequence chart showing an example of the operation when a call is made using the wireless call function. The processes in steps S31 to S35 are the same as the processes in steps S11 to S15 described above. When the wireless call function is used, the destination of the voice signal received from the terminal device 200 is switched to the wireless communication device 108 by the switching unit 107. Therefore, in step S36, the disaster prevention receiver 100 wirelessly transmits the voice signal received from the terminal device 200 from the wireless communication device 108 to the headset 400. In step S37, the headset 400 outputs a voice corresponding to the voice signal received from the disaster prevention receiver 100 from the speaker 402. As a result, as shown in FIG. 3, the voice of the maintenance staff B is output from the speaker 402 of the headset 400.

[0048] Returning to FIG. 6, when maintenance worker A speaks, in step S38, this voice is input into microphone 401 of headset 400. In step S39, headset 400 wirelessly transmits an audio signal indicating the voice input into microphone 401 to wireless communication device 108. When the wireless call function is used, the source of the audio signal transmitted to terminal device 200 is switched to wireless communication device 108 by switching unit 107. Therefore, in step S40, disaster prevention receiver 100 transmits the audio signal received by wireless communication device 108 to terminal device 200. The subsequent processing in steps S41 to S42 is the same as the processing in steps S22 to S23 described above.

[0049] FIG. 7 is a diagram showing an example of warning processing. While making a call using the wireless call function, when the communication between headset 400 and wireless communication device 108 is interrupted, warning processing is performed. The situation where the communication is interrupted includes, for example, a situation where the connection between headset 400 and wireless communication device 108 is released. For example, when headset 400 moves outside the communication range 180 of wireless communication device 108, when the power of headset 400 is turned off, or when headset 400 malfunctions and stops operating, the connection between headset 400 and wireless communication device 108 is released.

[0050] Control unit 102 checks the connection status between headset 400 and wireless communication device 108 at a predetermined time interval. For example, when the connection between headset 400 and wireless communication device 108 is released, control unit 102 warns a person near disaster prevention receiver 100 that the communication between headset 400 and wireless communication device 108 has been interrupted. As methods for this warning, there are a first method of outputting sound from at least one of speaker 103 and 350, and a second method of changing the display content of display unit 109.

[0051] In the first method, the control unit 102 causes at least one of the speakers 103 and 350 to output a warning sound indicating that the communication between the headset 400 and the wireless communication device 108 has been interrupted. This warning sound may be a predetermined sound such as "peep", or it may be an audio message indicating that the communication between the headset 400 and the wireless communication device 108 has been interrupted.

[0052] In the second method, the control unit 102 changes the display content of the display unit 109 so as to indicate that the communication between the headset 400 and the wireless communication device 108 has been interrupted. For example, as shown in FIG. 3, while the headset 400 and the wireless communication device 108 are connected, information 190 indicating that they are connected is displayed on the display unit 109. When the connection between the headset 400 and the wireless communication device 108 is released, the control unit 102 makes this information 190 non-displayed as shown in FIG. 7. Alternatively, the control unit 102 may cause the display unit 109 to display a warning message indicating that the communication between the headset 400 and the wireless communication device 108 has been interrupted. Thereby, a person around the disaster prevention receiver 100 can know that the communication between the headset 400 and the wireless communication device 108 has been interrupted.

[0053] Note that the situation where the communication is interrupted is not limited to the situation where the connection is released. For example, the situation where the communication is interrupted may include a situation where there is a high possibility that the communication cannot be established. For example, even when the headset 400 and the wireless communication device 108 are connected, when the headset 400 moves to the end of the communication range 180 of the wireless communication device 108, when the radio wave intensity of the wireless communication device 108 in the headset 400 becomes equal to or lower than a predetermined value, when the remaining battery level of the headset 400 becomes equal to or lower than a predetermined amount, or when there is a sign that the headset 400 is about to malfunction, it is considered that there is a high possibility that the communication cannot be established. Such a situation may also be included in the situation where the communication is interrupted.

[0054] According to the above-described embodiment, since the disaster prevention receiver 100 has a wireless call function and a loudspeaker call function, it is possible to listen to the voice of the other party wirelessly or by multiple people. Further, since the wireless call function and the loudspeaker call function can be switched and used, it is possible to listen to the voice of the other party wirelessly or by multiple people according to the situation. When using the wireless call function, since only the maintenance staff A wearing the headset 400 can hear the voice of the maintenance staff B who is the call partner, it is possible to prevent the content of the other party's conversation from being heard by the people around the disaster prevention receiver 100. When using the loudspeaker call function, a plurality of people at the installation location of the speaker 350 can confirm the content spoken by the maintenance staff B who is the call partner. In this way, by confirming the content spoken by the other party with multiple people, it is difficult to misidentify the content spoken by the other party.

[0055] Also, if only calls can be made using the maintenance telephone 500, the maintenance staff A cannot leave in front of the disaster prevention receiver 100 during the call. However, when using the wireless call function, the maintenance staff A can leave in front of the disaster prevention receiver 100 even during the call and move to in front of the terminal device 200 installed in an adjacent room, for example. In this case, the maintenance staff A can monitor both the disaster prevention receiver 100 and the terminal device 200 installed in the adjacent room. Then, since it is not necessary to arrange another maintenance staff different from the maintenance staff A in front of the terminal device 200 installed in the adjacent room, the number of maintenance staff can be reduced.

[0056] Modification The present invention is not limited to the above-described embodiment. The above-described embodiment may be modified and implemented as follows. The embodiment and the modification may be used in combination or may be switched and used according to the execution. Similarly, the following modifications may be used in combination or may be switched and used according to the execution.

[0057] In the above-described embodiment, the loudspeaker function and the wireless communication function do not necessarily have to be switched. For example, the loudspeaker function and the wireless communication function may be used in combination. In this case, sound is output from both the headset 400 and the speaker 350, and both the voice of the maintenance staff A wearing the headset 400 and the voice of a person around the disaster prevention receiver 100 can be heard on the terminal device 200 side. In this modification, the switching unit 107 supplies the voice signal received from the terminal device 200 to both the amplifier 300 and the wireless communication device 108. Further, the switching unit 107 transmits both the voice signal supplied from the wireless communication device 108 and the voice signal supplied from the microphone 104 to the terminal device 200.

[0058] Also, in a specific situation, sound may be output from both the headset 400 and the speaker 350. FIG. 8 is a diagram showing an example of how sound is output according to this modification. For example, when a fire detector detects the occurrence of a fire and the disaster prevention receiver 100 receives a fire signal from the fire detector via the signal line 620, a voice informing of the occurrence of the fire, such as "There is a fire. There is a fire.", may be output from both the speaker 350 and the headset 400. This voice may include information indicating the location of the fire. Also, not only the voice informing of the occurrence of the fire but also the voice of the person on the terminal device 200 side may be output from both the speaker 350 and the headset 400. Further, both the voice of the maintenance staff A wearing the headset 400 and the voice of a person around the disaster prevention receiver 100 may be made audible on the terminal device 200 side. According to this modification, both the person wearing the headset 400 and the person around the disaster prevention receiver 100 can recognize the occurrence of the fire and the content of the conversation of the other party. Also, a plurality of people including the person wearing the headset 400 and the person around the disaster prevention receiver 100 can talk to the person on the terminal device 200 side.

[0059] In the above-described embodiment, when the communication between the headset 400 and the wireless communication device 108 is interrupted while making a call using the wireless call function, in addition to or instead of issuing a warning on the disaster prevention receiver 100 side, this situation may be notified to the maintenance staff B of the call partner. For example, when the communication between the headset 400 and the wireless communication device 108 is interrupted, the control unit 102 transmits a signal indicating this situation to the terminal device 200 via the signal line 620. When the terminal device 200 receives this signal, it performs a warning process. For example, when the terminal device 200 has a speaker, a warning sound may be output from this speaker. When the terminal device 200 has a display unit, a warning message indicating that the communication between the headset 400 and the wireless communication device 108 has been interrupted may be displayed on this display unit. Alternatively, when the communication between the headset 400 and the wireless communication device 108 is interrupted, the control unit 102 may transmit a warning sound signal indicating a warning sound to the terminal device 200 via the telephone line 610 to output a warning sound from the speaker of the maintenance telephone 250 connected to the terminal device 200. According to this modification, the maintenance staff B can know that it becomes impossible to communicate with the maintenance staff A of the call partner.

[0060] In the above-described embodiment, the maintenance staff B on the terminal device 200 side may also be enabled to make a wireless call. In this case, the maintenance telephone 250 may not be used. FIG. 9 is a diagram showing an example of the configuration of the terminal device 200 according to this modification. In this modification, the terminal device 200 includes a wireless communication device 202 similar to the wireless communication device 108. The maintenance staff B wears a headset 260 similar to the headset 400. The wireless communication device 202 communicates wirelessly with the headset 260. According to this modification, the maintenance staff B can also make a wireless call using the headset 260.

[0061] Also, when a plurality of terminal devices 200 each have a wireless communication device 202, in order for maintenance staff B to perform maintenance on the plurality of terminal devices 200, it may be necessary to move between the plurality of terminal devices 200 while wearing the headset 260. At this time, as maintenance staff B moves, the connection destination of the headset 260 may be automatically switched. FIG. 10 is a diagram showing an example of switching the connection destination of the headset 260 according to this modification. As shown in FIG. 10, when maintenance staff B wearing the headset 260 is within the communication range 280A of the wireless communication device 202 of the terminal device 200A, the headset 260 and the wireless communication device 202 of the terminal device 200A are connected. When maintenance staff B wearing the headset 260 moves from the communication range 280A of the wireless communication device 202 of the terminal device 200A to the communication range 280B of the wireless communication device 202 of the terminal device 200B, the connection between the headset 260 and the wireless communication device 202 of the terminal device 200A is released, and the headset 260 and the wireless communication device 202 of the terminal device 200B are newly connected. As a result, the connection destination of the headset 260 is switched from the wireless communication device 202 of the terminal device 200A to the wireless communication device 202 of the terminal device 200B. This switching of the connection destination may be performed using a known roaming function. According to this modification, even when maintenance staff B moves between the plurality of terminal devices 200, a wireless call can be continued without manually switching the connection destination.

[0062] In the above-described embodiment, a plurality of headset 400 may be provided. In this modification, the wireless communication device 108 performs wireless communication with a plurality of headset 400. According to this modification, a plurality of people on the disaster prevention receiver 100 side can each use the headset 400 to communicate with each other. Further, in this modification, when at least one of the plurality of headset 400 moves outside the communication range 180 of the wireless communication device 108, that headset 400 is identified, and it may be warned that communication between the identified headset 400 and the wireless communication device 108 has been interrupted. For example, the wireless communication device 108 acquires the identification information of the headset 400 when the connection is established. When the headset 400 moves outside the communication range 180, the wireless communication device 108 supplies the identification information of that headset 400 to the control unit 102. The control unit 102 outputs a voice indicating the identification information of the headset 400 supplied from the wireless communication device 108 from at least one of the speakers 103 and 350, or causes the display unit 109 to display this identification information. According to this modification, it is possible to know which of the plurality of headset 400 has moved outside the communication range 180.

[0063] In the above-described embodiment, the head-mounted device is not limited to the headset 400. The head-mounted device may be any device as long as it is mounted on a person's head and has a speaker 402. For example, when only the voice of the call partner needs to be heard when the wireless call function is used, instead of the headset 400, headphones or earphones without a microphone 401 may be used. These headphones and earphones are also included in the head-mounted devices.

[0064] In the above-described embodiments, the disaster prevention control panel is not limited to the disaster prevention receiver 100 installed in the tunnel. The disaster prevention control panel may be any device as long as it is connected to the terminal device 200 and the speaker 350 and has a function of communicating with the terminal device 200. For example, when the disaster prevention system 10 is provided in a building such as a building, a fire receiver is used instead of the disaster prevention receiver 100. This fire receiver is also included in the disaster prevention control panel.

[0065] In the above-described embodiments, the configuration of the disaster prevention system 10 is not limited to the above-described examples. The disaster prevention system 10 may be configured to include one or more of the above-described devices, or may be configured without including some of the devices. For example, when only the voice of the communication partner needs to be heard when the public address function is used, the disaster prevention receiver 100 may not be provided with the microphone 104. Further, the subject having the function of the disaster prevention system 10 is not limited to the above-described examples. For example, the function of the disaster prevention receiver 100 may be realized by a plurality of devices cooperating with each other. The amplifier 300 and the speaker 350 may be an integrated device.

[0066] In the above-described embodiments, the operation of the disaster prevention system 10 is not limited to the above-described examples. The processing procedure of the disaster prevention system 10 may be changed in order as long as there is no contradiction. Also, some of the processing procedures of the disaster prevention system 10 may be omitted.

[0067] Another aspect of the present invention may provide a method having steps of processing performed in the disaster prevention system 10, the disaster prevention receiver 100, or the terminal device 200. Still another aspect of the present invention may provide a program executed in the disaster prevention receiver 100 or the terminal device 200. This program may be provided by being stored in a computer-readable recording medium, or may be provided by being downloaded via the Internet or the like.

Explanation of Signs

[0068] 10: Disaster prevention system, 100: Disaster prevention receiver, 101: First connection detection unit, 102: Control unit, 103: Speaker, 104: Microphone, 105: Plug-in port, 106: Second connection detection unit, 107: Switching unit, 108: Wireless communication device, 109: Display unit, 110: Switch, 200: Terminal device, 201: Plug-in port, 250: Maintenance telephone, 300: Amplifier, 350: Speaker, 400: Headset, 401: Microphone, 402: Speaker, 500: Maintenance telephone

Claims

1. A disaster prevention system comprising a plurality of terminal devices and a disaster prevention control panel, wherein each of the plurality of terminal devices is wirelessly connected to a first wearable device within its communication range and includes a plurality of first wireless communication devices that wirelessly communicate with the first wearable device, the connection destination of the first wearable device is switched to any one of the plurality of first wireless communication devices as the person wearing the first wearable device moves without the person manually switching the connection destination, the disaster prevention control panel is wirelessly connected to a second wearable device within its communication range and includes a second wireless communication device that wirelessly communicates with the second wearable device, each of the first wearable device and the second wearable device has a speaker that outputs sound corresponding to an audio signal and a microphone that converts the input sound into an audio signal, the first wearable device and the second wearable device transmit and receive the audio signal to and from each other via the terminal device connected to the first wearable device among the plurality of terminal devices and the disaster prevention control panel and are used for wireless calls, at least one of the plurality of terminal devices performs a warning process when the communication between the second wearable device and the second wireless communication device is interrupted, A disaster prevention system.

2. Each of the plurality of terminal devices further includes a speaker, and at least one of the speakers of the plurality of terminal devices outputs a warning sound when the communication between the second wearable device and the second wireless communication device is interrupted. The disaster prevention system according to Claim 1.

3. Each of the plurality of terminal devices further includes a display unit, and at least one of the display units of the plurality of terminal devices changes the display content to indicate the situation when the communication between the second wearable device and the second wireless communication device is interrupted. The disaster prevention system according to Claim 1.

4. The disaster prevention control panel further includes a display unit that displays the identification information of the second wearable device in the situation where the communication with the second wireless communication device is interrupted. The disaster prevention system according to Claim 1.

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