JP2024004912A - Emergency notification system of railway vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To grasp a train number where an emergency notification device having performed emergency notification operation is arranged.

SOLUTION: An emergency notification system of a railway vehicle composed of a plurality of trains includes; emergency notification devices (10) arranged in passenger rooms (3) provided in each of the plurality of trains; a controller (20) for applying a predetermined voltage to wiring (10a) provided between each of the passenger rooms (3) and a crew room (2), when emergency notification operation for the emergency notification device (10) is performed; and a generation part (50) for generating a sound signal which is output to a sound line (10a), and includes information for identifying the train where the emergency notification device (10) having performed the emergency notification operation is arranged.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to an emergency notification system for a railway vehicle.

BACKGROUND ART Conventionally, there is an emergency notification device that is mounted on a railway vehicle and makes an emergency notification from a cabin to a crew member (see, for example, Patent Document 1).

JP2009-56921A

SUMMARY OF THE INVENTION An object of the present invention is to provide an emergency notification system for a railway vehicle that allows the number of a railway vehicle to be appropriately identified to which an emergency notification using an emergency notification device has been made.

One aspect of the present invention is an emergency notification system for a railway vehicle consisting of a plurality of cars, including an emergency notification device disposed in a cabin provided in each of the plurality of cars, and an emergency notification operation for the emergency notification device. a controller that applies a predetermined voltage to an audio line installed between each cabin and the crew cabin, and an audio signal that is output to the audio line when the emergency call operation is performed. This is an emergency notification system for a railway vehicle, including a generation unit that generates an audio signal that includes information for identifying a car number in which an emergency notification device is installed.

According to the present invention, it is possible to suitably grasp the car number of a railway vehicle to which an emergency call using an emergency call device has been made.

FIG. 1 is a diagram showing an emergency notification system for a railway vehicle according to a reference example. FIG. 2 is a diagram mainly showing a configuration example of the cabin side of the emergency notification system for a railway vehicle according to the embodiment. FIG. 3 is a diagram mainly showing a configuration example on the crew cabin side of the emergency notification system for a railway vehicle according to the embodiment.

Hereinafter, an emergency notification system for a railway vehicle according to an embodiment will be described with reference to the drawings. The configuration of the embodiment is an example, and the present invention is not limited to the configuration of the embodiment.

<Reference example>
FIG. 1 is a diagram showing an emergency notification system for a railway vehicle according to a reference example. In FIG. 1, a railway vehicle 1 constitutes a formation consisting of two or more vehicles. The vehicles consist of a leading vehicle and an intermediate vehicle. The leading vehicle is placed at the beginning and end of the plurality of vehicles forming the formation. However, it may be placed only at the beginning. The intermediate vehicle is placed between the leading vehicles. In the example shown in FIG. 1, only the leading vehicle is shown. The lead vehicle is equipped with a crew cabin 2 and a passenger cabin 3. Note that the intermediate vehicle includes a passenger compartment 3. Intermediate cars are also called passenger cars. Each vehicle is assigned an identification number called a car number (car number 1, car number 2, etc. from the beginning).

The crew cabin 2 is equipped with a notification controller 20a, a communication receiver 4 connected to the notification controller 20a, and a microphone 5 and a speaker 5b connected to the communication receiver 4. The communication receiver 4 has a button 31 for "confirm", a button 32 for "hold", a button 33 for "reset", a lamp 34 indicating "wireless", and a lamp indicating "report". 35, a lamp 36 indicating "confirmation", a lamp 37 indicating "hold", and a speaker 38 for a buzzer are connected. The communication receiver 4 controls the lighting and extinguishing of the lamps 34 to 37. The lamp 34 lights up while the radio is in use. The lamp 35 lights up when there is an emergency call. The lamp 36 lights up when the "confirm" button 31 is pressed. The lamp 37 lights up when the "hold" button 33 is pressed to put a call on hold (if it is on).

On the other hand, each cabin 3 of the railway vehicle 1 is equipped with one or more (four in the example of FIG. 1) emergency notification devices 10 and a notification controller 20 to which each of the emergency notification devices 10 is connected. Two or more emergency notification devices 10 are arranged in the passenger compartment 3 of the railway vehicle 1. Two or more emergency notification devices 10 arranged in the passenger compartment 3 of the railway vehicle 1 refer to cases where two or more emergency notification devices 10 are arranged in one passenger compartment 3 provided in the railway vehicle 1, and two or more emergency notification devices 10 arranged in the passenger compartment 3 of the railway vehicle 1 This includes a case where a total of two or more emergency notification devices 10 are arranged in two or more guest rooms 3 provided within the cabin.

Each of the emergency call devices 10 includes a speaker 11 and a microphone 12 for talking to the crew in an emergency, an emergency call button 13, a lamp 14 indicating "call ready", a reset button 15, and a buzzer speaker 16. have. Furthermore, vehicle side lights 28a and 28b are attached to both sides of the vehicle. When the railway vehicle 1 consists of two or more vehicles, the notification controller 20 is provided for each vehicle. In this case, a lead-through line extending between vehicles can be used as the audio line 10a.

Emergency notification using the emergency notification device 10 in the reference example is performed as follows. In the event of an emergency in the cabin 3, passengers or the like can press the emergency call button 13 of the emergency call device 10 as an emergency call operation. Emergency call processing is started by the emergency call operation.

When the emergency notification button 13 is pressed, the emergency notification device 10 causes the speaker 16 to emit a buzzer sound, and causes the buzzer to sound in the cabin 3. Further, the emergency notification device 10 inputs a signal indicating that the emergency notification button 13 is pressed to the notification controller 20 as an emergency notification signal. The notification controller 20 that receives the emergency notification signal from the emergency notification device 10 turns on the switch S1 and applies a predetermined bias voltage (for example, 100V) from the voltage source V1 to the notification controller 20 and the notification receiver. Application (pressure) is applied to the emergency call cabin audio line (audio line) 10a that connects with the controller 20a. Note that the wiring to be pressurized may be provided with a dedicated wiring for pressurization (dedicated reporting line) separately from the audio line. In other words, the wiring to be pressurized may be a voice line or a dedicated reporting line, and existing wiring other than the voice line may be used for pressurization as long as there is no effect due to pressurization. It's okay to be hit. Audio lines, dedicated reporting lines, and existing wiring are examples of "wires (to be pressurized)." Hereinafter, a case where the wiring to be pressurized is the audio line 10a (that is, a configuration in which the audio line 10a also serves as the wiring to be pressurized) will be described.

Furthermore, in the vehicle where the emergency call button 13 is pressed, the vehicle side lights 28a and 29b are turned on in response to the application of the bias voltage, and the vehicle to which the emergency call has been made can be visually recognized from outside the railway vehicle 1. Furthermore, if a train information management device (also referred to as a monitor device) is mounted on the railway vehicle 1, the press of the emergency call button 13 is notified to the monitor device. The monitor device is a device that collects and manages information indicating the status of the railway vehicle 1. In some cases, the railway vehicle 1 is not equipped with a monitor device.

The notification controller 20a detects pressurization of the audio line 10a, and inputs a signal indicating the detection of pressurization to the communication receiver 4 as an emergency notification signal. The communication receiver 4, which has received the emergency report signal from the receiver controller 20a, emits a buzzer sound from the speaker 38 and lights up the "report" lamp 35. The crew member can recognize the occurrence of an emergency call from the sound of the buzzer and the lighting of the lamp 35. The crew member picks up the receiver of the communication receiver 4 (equipped with a microphone 5a and a speaker 5b) and presses the "Confirm" button 31. When the contact receiver 4 detects that the button 31 is pressed, it stops emitting the buzzer sound from the speaker 38. Further, the communication receiver 4 turns off the lamp 35 and turns on the lamp 36 indicating "confirmation".

The communication receiver 4 sends a signal (referred to as a confirmation signal) indicating that the "confirmation" button 31 has been pressed to the communication controller 20a. The confirmation signal is input via the audio line 10a and the notification controller 20 to the emergency notification device 10 when the button 13 is pressed. Upon receiving the confirmation signal, the emergency notification device 10 stops emitting the buzzer sound from the speaker 16, turns on the speaker 11 and the microphone 12, and enables communication with the crew member in the crew cabin 2. At this time, the emergency notification device 10 lights up the "call ready" lamp 14. Thereafter, when the crew member wants to end the call, the crew member presses the reset button 33. Furthermore, by pressing the reset button 15, the passenger can end the call.

Note that when the emergency notification buttons 13 of a plurality of (n) emergency notification devices 10 are pressed, the behavior differs depending on the timing of pressing. n units including a certain emergency notification device 10 are pressed until the emergency notification button 13 of a certain emergency notification device 10 is pressed, the audio line 10a is pressurized, and the “confirm” button 31 is pressed in the crew cabin 2. When the emergency notification buttons 13 of (two or more) emergency notification devices 10 are pressed, a confirmation signal is sent to each of the emergency notification devices 10 whose emergency notification buttons 13 were pressed by pressing the "confirm" button 31. This allows simultaneous communication between the n emergency notification devices 10 and the crew members. After that, if the emergency call button 13 of another emergency call device 10 is pressed, the emergency call signal is transmitted to the communication receiver 4, and when the crew member presses the "confirm" button 31, the confirmation signal is transmitted to the other emergency call device 10. The information is sent to the emergency notification device 10, and the state becomes available for simultaneous calls. Simultaneous calls using two or more emergency notification devices 10 may be made within one vehicle or may be made across multiple vehicles.

Each of the emergency notification device 10, the notification controller 20, the notification controller 20a, and the communication receiver 4 includes a processor such as a CPU (Central Processing Unit) and a memory, and the software processing of the processor (stored in the memory) The above-mentioned process can be performed by the process in which the processor executes the program. The software processing can also be executed by processing using hardware (semiconductor device) such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

In the reference example, the emergency call button 13 is pressed and a predetermined voltage of 100V is applied to the audio line 10a. At this time, if the monitoring device is not mounted on the railway vehicle 1, it is not possible to specify the vehicle (car number) in which the emergency notification device 10 whose emergency notification button 13 was pressed is arranged. In the embodiment described below, such problems are solved and the number of emergency call operations using the emergency call device in the railway vehicle can be appropriately grasped.

<Embodiment>
FIG. 2 is a diagram mainly showing a configuration example on the cabin side of the emergency notification system of the railway vehicle 1 according to the embodiment. FIG. 3 is a diagram mainly showing a configuration example on the crew cabin side of the emergency notification system for the railway vehicle 1 according to the embodiment. Since the emergency notification system according to the embodiment has a configuration common to that of the reference example, the same reference numerals are given to the same configurations as the reference example, and the description thereof will be omitted as appropriate.

In FIG. 2, the emergency notification system according to the embodiment differs from the reference example in the following points. That is, the notification controller 20 according to the embodiment includes the sound source board 50. Moreover, the emergency notification system according to the embodiment has the following configuration. The notification controller 20 is capable of applying two or more different voltages to the audio line (through-line) 10a. In the example shown in FIG. 2, a switch S1 applies a first voltage (for example, a voltage value of 90 V) from a voltage source V1, and a switch S1 applies a second voltage (for example, a voltage value of 100 V) from a voltage source V2. S2 is provided. The types (number) of voltage values may be greater than 2, and the magnitude of the voltage values can be set as appropriate. For example, the first voltage value is 25V, the second voltage value is 50V, the third voltage value is 75V, and the fourth voltage value is 100V. For example, voltage sources and switches for voltages to be applied to the audio line 10a are prepared depending on the number of voltage values. Note that D1, D2, and D in FIG. 2 are diodes for preventing backflow.

The notification controller 20 has a size corresponding to the number of times the emergency notification button 13 has been pressed, that is, the number of emergency notification devices 10 on which the emergency notification button has been pressed (an emergency notification operation has been performed) with respect to the audio line 10a. A voltage of (voltage value) is applied to the audio line 10a. In the example shown in FIG. 2, when the number of emergency notification devices 10 whose emergency notification button 13 has been pressed is one, the notification controller 20 turns on the switch S1 and applies a voltage of 90V to the audio line 10a. to be applied. On the other hand, if the number of emergency notification devices 10 whose emergency notification button 13 has been pressed is two or more, the notification controller 20 turns on the switch S2 and applies a voltage of 100V to the audio line 10a. .

For example, the notification controller 20 can detect the voltage value applied to the audio line 10a upon receiving an emergency notification signal from each emergency notification device 10. The voltage value can be detected using information indicating the on/off state of the switches S1 and S2 (determined as S1 on → 90V). Alternatively, the voltage value may be detected by measuring the voltage of the audio line 10a. When the notification controller 20 receives an emergency notification signal, it detects the voltage value applied to the audio line 10a, and when the applied voltage value is detected, the notification controller 20 applies a voltage value one level higher than the voltage value to the audio line. 10a. For example, when the notification controller 20 detects a voltage value of 90V (or 25V), it applies a voltage value of 100V (50V), which is one step larger than that, to the audio line 10a. According to this embodiment, it becomes possible to grasp the number of emergency notification devices from the magnitude of the voltage.

In the embodiment, the emergency notification device 10 includes a plurality of (two or more) lamps 14. In the example shown in FIG. 2, the emergency notification device 10 has a plurality of lamps 14 (three lamps 14a, 14b, and 14c in the example of FIG. 2). An appropriate number of lamps 14 can be adopted as long as it is two or more. The notification controller 20 sends a signal indicating the voltage value applied to the audio line 10a to the emergency notification device 10 whose emergency notification button 13 is pressed, and the emergency notification device 10 lights up or flashes according to the voltage value. The lamp 14 is turned on in a pattern (including a combination pattern of lighting and blinking). This allows passengers to grasp the number of emergency notification devices 10. Note that even when the number of lamps 14 is one, the number of emergency notification devices 10 can be grasped by blinking the lamps 14 in a blinking pattern according to the voltage value.

Also, regarding the vehicle side lights 28a and 29b, the notification controller 20 controls the blinking of the vehicle side lights 28a and 28b in a blinking pattern according to the voltage value applied to the audio line 10a, so that the emergency notification device 10 can be grasped from the outside of the railway vehicle 1. In addition, the number of vehicle side lights 28 provided on one side of the vehicle is set to 2 or more, and the lighting or blinking of the vehicle side lights 28 is controlled by a lighting or lighting pattern (including a combination pattern of lighting and blinking) according to the voltage value. It is also possible to do so.

In FIG. 3, the reception controller 20a according to the embodiment detects the voltage value applied to the audio line 10a by measurement or the like, and inputs a signal indicating the detected voltage value to the communication receiver 4. A plurality of lamps 35 (35a, 35b, and 35c) are connected to the communication receiver 4. The communication receiver 4 uses at least one of the plurality of lamps 35 to control the lighting or blinking of the lamp 35 in a lighting or blinking pattern (including a combination pattern of lighting and blinking) depending on the voltage value. . This allows the crew member to grasp the number of emergency notification devices 10.

Returning to FIG. 2, the emergency notification device 10 according to the embodiment has a plurality of emergency notification buttons 13 (13a, 13b, and 13c in the example shown in FIG. 2). The emergency call buttons 13a, 13b, and 13c are provided in association with the type (category) of an abnormal situation that has occurred in the guest room 3. For example, when smoke or fire breaks out in the cabin, press the emergency call button 13a, when an injury occurs, press the emergency call button 13b, and for other abnormal situations (suddenly sick person, etc.) press the emergency call button 13c. Press. However, the number of emergency call buttons 13 and the types of abnormal situations assigned to each button 13 can be set as appropriate.

Information (signal) indicating the pressed emergency call button 13 is input to the communication receiver 4 via the audio line 10a and the receiver controller 20a. The communication receiver 4 can vary (differentiate) the ringing pattern of the buzzer output from the speaker 38 according to the number of emergency notification devices 10 whose emergency notification button 13 has been pressed.

Further, the communication receiver 4 lights up one of the lamps 35a, 35b, and 35c corresponding to the information indicating the emergency report button 13. In this embodiment, the lamp 35a is associated with the emergency report button 13a, the lamp 35b is associated with the emergency report button 13b, and the lamp 35c is associated with the emergency report button 13c. Therefore, when the information indicating the emergency call button 13 indicates the button 13a, the communication receiver 4 lights up the lamp 35a. When the information indicating the emergency call button 13 indicates the button 13b, the communication receiver 4 turns on the lamp 35a. When the information indicating the emergency call button 13 indicates the button 13c, the communication receiver 4 turns on the lamp 35c.

The crew member can understand the type of abnormal situation that has occurred in the cabin 3 by understanding whether the lamps 35a, 35b, and 35c are on or off. Note that the association between the button 13 and the lamp 35 is just an example, and it is sufficient if the pressed button 13 (type of abnormal situation) can be determined from the lighting or blinking pattern of the lamp 35. At this time, the number of emergency notification devices 10 can be determined from the lighting or blinking pattern. Note that providing a plurality of buttons 13 and lamps 35 depending on the type of abnormal situation is an option and is not an essential component. There may be one button 13 and one lamp 35. Even in this case, as described above, the number of emergency notification devices 10 whose emergency notification buttons 13 have been pressed can be ascertained by the blinking pattern according to the voltage value.

Note that the light sources of the lamp 14, the vehicle side light 28, and the lamp 35 may be a light bulb, a light emitting diode (LED), or an organic EL.

The crew member in the crew cabin 2 can grasp not only the type of abnormal situation but also the number of emergency notification devices 10 whose emergency notification button 13 has been pressed from the lighting or blinking patterns of the lamps 35a, 35b, and 35c. The crew member presses the "confirm" button 31. Then, a confirmation signal is transmitted to the emergency notification device 10 whose emergency notification button 13 was pressed. Here, in order to simplify the discussion, a case will be described in which there is only one emergency notification device 10 in which the emergency notification button 13 is pressed.

The notification controller 20 is provided for each vehicle (car number), and the sound source board 50 has a preset voice indicating the car number in which the emergency notification device 10 is installed (for example, "The emergency call source is car number 4"). This is a playback device. In this embodiment, the emergency notification device 10 disposed in each car (vehicle) is configured so that sentences (dialogue) including the number of that car are reproduced as audio. The sound source board 50 is composed of, for example, an integrated circuit (IC). The notification controller 20 converts the reproduced audio into an audio signal and connects it to the audio line 10a. The audio signal is input to the communication receiver 4 via the receiver controller 20a. The contact receiver 4 connects the audio signal to the speaker 5b. As a result, a sound based on the sound signal is emitted from the speaker 5b, and by listening to the sound, the crew member can ascertain the car number from which the emergency call was made. In this embodiment, the emergency notification device 10 disposed in each car (vehicle) is configured so that a sentence including the number of that car is reproduced as audio.

The sound source board 50 generates audio signals in the audible range. Instead of this audio signal, the sound source board 50 or the signal generation circuit generates a signal (for example, a tone signal) in an inaudible range that includes information indicating the identification information (car number) of the car, and connects the audio line 10a and the receiver. The information is transmitted to the communication receiver 4 via the communication controller 20a. The communication receiver 4 has, for example, a sound source board similar to the sound source board 50, reproduces sound according to the tone signal, and is connected to the speaker 5b. This allows the crew to hear a voice saying something like ``The source of the emergency call is car No. 4'' and understand which car made the emergency call.

Further, the identification information of the car number corresponding to the tone signal may be notified to the crew members by means other than audio (for example, lighting or flashing patterns of the lamps 35, etc.). Further, the tone signal (inaudible range signal) generated by the notification controller 20 includes information indicating the number of emergency notification devices whose emergency notification button has been pressed, and the sound based on this information is the sound source of the communication receiver 4. It may also be played on the board.

In addition, when adopting a configuration in which a voice signal or an inaudible range signal is generated and transmitted to the communication receiver 4, a configuration in which multiple types of voltages are prepared to be applied to the voice line 10a, and a configuration in which the button 13, lamp 14, and lamp 35 are The configuration in which a plurality of units are prepared depending on the type of situation is an option, and the configuration similar to the reference example may be used in this regard.

Furthermore, the emergency notification system according to the embodiment may have the following configuration as an option. As shown in FIG. 2, a broadcasting device 6 is arranged in the crew cabin 2, and the broadcasting device 6 is connected to an output amplifier (amplifier) 8 via a transmission path (signal line) 7 for broadcasting audio signals. Ru. The audio signal output from the output amplifier 8 is connected via the switch 23 and the wiring 9a to the speakers 9 respectively connected to the wiring 9a, and each speaker 9 emits audio according to the audio signal. In this way, the automatic broadcasting audio signal generated by the broadcasting device 6 and the crew member's audio signal input from the microphone are connected to the speaker 9 and broadcast into the cabin 3.

In the embodiment, a series circuit of a microphone amplifier 24, a filter 25, and a line amplifier 26 is connected to the switch 23, and the output of the line amplifier 26 is connected to a switch 27 provided on the audio line 10a. The operations of the switch 23 and the switch 27 are controlled by the notification controller 20, for example. When the notification controller 20 detects that the emergency notification button 13 of the emergency notification device 10 is pressed, it controls the switch 23 so that the wiring 9a and the microphone amplifier 24 are connected, and the line amplifier 26 is connected to the audio line 10a. The switch 27 is controlled so that the As a result, when the emergency call button 13 is pressed, the sound in the cabin 3 collected using the speaker 9 is sent to the communication receiver 4, and the crew can listen to it using the speaker 5b or use the recording device. You can also record audio. By listening, the crew member can grasp the situation inside the cabin 3.

The emergency notification system according to the embodiment is an emergency notification system for a railway vehicle 1 including a plurality of cars (vehicles). The emergency notification system includes an emergency notification device 10 disposed in a cabin 3 provided in each of a plurality of cars. In addition, the emergency call system is configured such that when an emergency call operation is performed on the emergency call device 10 (pressing the emergency call button 13), an audio line 10a (wireless A notification controller 20 (an example of a controller) that applies a predetermined voltage to a car (one example) and an audio signal output to the audio line 10a, which indicates the car number in which the emergency notification device 10 in which the emergency notification operation has been performed is arranged. A sound source board 50 (an example of a generation unit) that generates an audio signal including identification information is included. The audio signal is sent to the crew cabin, and the crew obtains information to identify the car from the audio signal, allowing the crew to know which car the emergency call was made to.

In the emergency call system according to the embodiment, by applying a predetermined voltage, the emergency call lamp 35 disposed in the crew cabin 2 is turned on, and the buzzer disposed in the crew cabin 2 is sounded (the buzzer sound from the speaker 39 is emitted). ) is performed. On the other hand, when the crew member performs a call operation (pressing the "confirm" button 31) in response to at least one of lighting the lamp 35 and sounding the buzzer, the audio signal from the generator is transmitted to the audio line 10a. Output. In this way, when a call becomes possible, an audio signal is transmitted to the crew member.

The sound source board 50 (notification controller 20 having the sound source board 50) as a generation unit is arranged for each of a plurality of cars, and the number of the car in which the notification controller 20 having the sound source board 50 is arranged is stated as an audio signal. Generates a signal for audio playback. In this way, audio including information for identifying the car number can be prepared for each car number. In this case, even if the generation unit itself does not know the car number in which it is placed, it can send an audio signal that includes information for identifying the car number.

The generation unit may be a device or a circuit that generates a signal in an inaudible range that includes information for identifying the car number instead of the audio signal. In this case, a tone signal indicating the car number may be generated as the signal in the inaudible range. The configuration of the embodiment described above can be modified as appropriate without departing from the objective of the present invention.

1... Railway vehicle 2... Crew cabin 3... Cabin 4... Communication receiver 5... Handset 6... Broadcast device 7... Broadcast audio signal transmission path 8... - Power amplifier 9...Speaker 9a...Wiring 10a...Audio line 10...Emergency call device 11...Speaker for receiving calls 12...Microphone for sending calls 13...Emergency call button 14, 35... Lamp 20... Notification controller 20a... Notification controller 50... Sound source board

Claims (5)

An emergency notification system for a railway vehicle consisting of multiple cars,
an emergency notification device disposed in a cabin provided in each of the plurality of cars;
a controller that applies a predetermined voltage to wiring provided between each cabin and a crew cabin provided in the railway vehicle when an emergency notification operation is performed on the emergency notification device;
An audio signal output to an audio line provided between each passenger cabin and the crew cabin, the audio signal including information identifying a car number in which an emergency notification device in which the emergency notification operation was performed is installed. An emergency notification system for a railway vehicle, including a generation unit that generates. By applying the predetermined voltage, at least one of lighting an emergency call lamp disposed in the crew compartment and sounding a buzzer disposed in the crew compartment,
The emergency notification system for a railway vehicle according to claim 1, wherein the audio signal is output to the audio line when a call operation is performed in response to at least one of lighting of the lamp and sounding of the buzzer. The generation unit is arranged for each of the plurality of cars, and generates, as the audio signal, a reproduced sound signal of a voice stating the number of the car in which the generation unit is arranged. emergency notification system. The emergency call system according to claim 1, wherein the generation unit generates a signal in an inaudible range that includes information for identifying the front symbol car instead of the audio signal. The emergency call system according to claim 4, wherein the generation unit generates a tone signal indicating a car number as the signal in the inaudible range.

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