Train broadcasting system

Abstract

The utility model provides a train broadcasting system, which belongs to the technical field of train broadcasting and comprises a broadcasting server, a repeater, a vehicle-mounted controller and a plurality of broadcasting terminal devices. The vehicle-mounted controller is connected with the broadcast server through the repeater; the broadcast terminal equipment comprises an equipment shell, a circuit board is arranged in the equipment shell, a play controller is arranged on the circuit board, and the play controller is connected with a voltage conversion module and a network module; each broadcast terminal device is connected with the vehicle-mounted controller through the network module; the playing controller is connected with a voice module, and the voice module is also connected with the voltage conversion module; the voltage conversion module is connected with a battery and an external power port, and a charging and discharging module is further connected between the battery and the external power port; and the external power supply port is arranged on the outer side of the equipment shell. According to the utility model, dual power supply for broadcast terminal equipment is realized, echo and microphone self-oscillation phenomena in a broadcast process are eliminated, and stable power supply can be provided according to voltage requirements of different equipment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of train broadcast, concretely relates to a train broadcast system. BACKGROUND

[0002] In the process of train operation, the broadcast system plays a crucial role, it is not only used for transmitting train arrival information, safety prompt and other key information, also undertakes the evacuation guidance task under the emergency. The traditional train broadcast system mostly adopts centralized control structure, namely all broadcast terminals are connected to the central control room through wired mode, is uniformly carried out by the central control room distribution and control of broadcast content. However, with the continuous progress of train technology and the increasing diversification of passenger demand, the traditional broadcast system gradually exposes some problems, such as wiring complex, high maintenance cost, poor expandability and unable to realize personalized broadcast etc.

[0003] In order to solve the above problems, in recent years, the train broadcast system based on network technology gradually rises. This kind of system usually adopts distributed control structure, connects broadcast server, repeater, vehicle-mounted controller and broadcast terminal equipment through network, realizes the digital transmission and remote control of broadcast content. This structure not only simplifies wiring, reduces maintenance cost, also improves the expandability and flexibility of system. The existing network-based train broadcast system still has some deficiencies in practical application. For example, the broadcast terminal equipment design of some train systems is not reasonable. First of all in power management, many train systems still rely on single external power supply, lack of backup power supply and intelligent power management function, once the external power supply is interrupted, the broadcast system will not work normally, brings the security risk to train operation. Secondly, the existing broadcast terminal equipment also has some defects in voice processing. For example, some devices may be disturbed by speaker echo or microphone self-excitation oscillation when playing broadcast content, leading to the decline of sound quality, affecting the listening experience of passengers. SUMMARY

[0004] The utility model provides a train broadcast system to at least solve the problem that many train systems in prior art still rely on single external power supply, lack of backup power supply and intelligent power management function, once the external power supply is interrupted, the broadcast system will not work normally, brings the security risk to train operation.

[0005] The train broadcast system provided by the embodiment of the present application comprises a broadcast server, a repeater, a vehicle-mounted controller and a plurality of broadcast terminal devices.

[0006] The vehicle-mounted controller is connected with the broadcast server through the repeater.

[0007] The broadcast terminal device comprises a device shell, a circuit board arranged inside the device shell, a playing controller arranged on the circuit board, a voltage conversion module and a network module connected with the playing controller;

[0008] Each broadcast terminal device is connected with the vehicle-mounted controller through the network module;

[0009] The playing controller is connected with a voice module, and the voice module is further connected with the voltage conversion module;

[0010] The voltage conversion module is connected with a battery and an external power supply port, and the battery and the external power supply port are further connected with a charge-discharge module;

[0011] The external power supply port is arranged on the outside of the device shell. Through the connection between the vehicle-mounted controller and the broadcast server, the basic function of the train broadcast system is realized, and the real-time transmission and control of the broadcast content are realized.

[0012] Further, the voice module comprises a loudspeaker, a power amplifier unit, an echo cancellation unit and a microphone;

[0013] The loudspeaker and the power amplifier unit are connected with the playing controller, and the connection line between the playing controller and the loudspeaker is further connected with the echo cancellation unit;

[0014] The echo cancellation unit is further connected with the power amplifier unit and the microphone;

[0015] The power amplifier unit and the echo cancellation unit are connected with the voltage conversion module;

[0016] The loudspeaker and the microphone are arranged on the outside of the device shell. Through the addition of the echo cancellation unit in the broadcast terminal device, the echo problem in the broadcast process is solved, the clarity of the broadcast content is improved, and the auditory experience of the passengers is improved.

[0017] Further, the voltage conversion module comprises a first voltage conversion unit, a second voltage conversion unit, a third voltage conversion unit and a fourth voltage conversion unit;

[0018] The input end of the first voltage conversion unit is connected with the external power supply port, the output end of the first voltage conversion unit is connected with a power supply VCC1, and is connected with the input end of the power amplifier unit and the second voltage conversion unit;

[0019] The output end of the second voltage conversion unit is connected with a power supply VCC2, and is connected with the input end of the echo cancellation unit, the third voltage conversion unit and the fourth voltage conversion unit;

[0020] The output end of the fourth voltage conversion unit is connected with a power supply VCC4, and is connected with the positive electrode of the battery, and the negative electrode of the battery is grounded;

[0021] The input end of the third voltage conversion unit is also connected with the positive electrode of the battery, the output end of the third voltage conversion unit is connected with the power supply VCC3 and is connected with the play controller. Through the multi-stage voltage conversion unit, the power supply for the devices with different voltage requirements is realized, the stability and reliability of the system are improved, and at the same time, the double power supply mode of the battery and the external power supply ensures the normal operation of the system in the case of unstable power.

[0022] Further, the first voltage conversion unit converts the 220V alternating voltage of the external power supply port into 24V direct current voltage, the second voltage conversion unit converts the 24V direct current voltage into 5V direct current voltage, the third voltage conversion unit converts the 5V direct current voltage into 3.3V direct current voltage, and the fourth voltage conversion unit converts the 5V direct current voltage into 3.7V direct current voltage. The voltage conversion relationship of each stage of voltage conversion unit is specifically explained, which provides clear guidance for the design and implementation of the system, ensures that each device works at the appropriate voltage, and improves the efficiency and stability of the system.

[0023] Further, the network module includes a wireless network unit and a wired network unit;

[0024] The wired network unit includes a network controller, an Ethernet transformer and a network port;

[0025] The network controller is connected with the play controller and the Ethernet transformer;

[0026] The network port is connected with the Ethernet transformer;

[0027] The network port is arranged on the outside of the device shell;

[0028] The wireless network unit is connected with the power supply VCC2, and the network controller and the Ethernet transformer are connected with the power supply VCC3. The wired and wireless network modules are added in the broadcast terminal device, data transmission under various network conditions is realized, and the flexibility and adaptability of the system are improved.

[0029] Further, the voice module further includes an intercom button, the intercom button is connected with the play controller and is arranged on the outside of the device shell. The intercom button is added on the device shell, which facilitates the emergency intercom of the staff.

[0030] Further, the echo cancellation unit is provided with a first input end IN1, a second input end IN2 and an output end OUT;

[0031] The first input end IN1 is connected with the microphone, the second input end IN2 is connected with a resistor R8, the other end of the resistor R8 is connected with the connection line of the loudspeaker and the play controller, and the output end OUT is connected with the power amplifier unit. The echo cancellation unit solves the echo problem and improves the sound quality of the broadcast system.

[0032] Further, the power amplifier unit comprises an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6;

[0033] The same direction input end of the operational amplifier U1 is connected with the first end of the resistor R3 and the first end of the capacitor C3, and the reverse input end of the operational amplifier U1 is connected with the first end of the capacitor C4 and the first end of the resistor R6;

[0034] The second end of the resistor R3 is connected with the first end of the resistor R2, the first end of the capacitor C1 and the first end of the resistor R1, the second end of the resistor R1 is grounded, the second end of the capacitor C1 is grounded, and the second end of the resistor R2 is connected with the power supply VCC1;

[0035] The second end of the capacitor C3 is connected with the first end of the resistor R4 and the sound elimination unit;

[0036] The second end of the capacitor C4 is connected with the first end of the resistor R5, and the second end of the resistor R5 is grounded;

[0037] The reverse input end of the operational amplifier U1 is connected with the second end of the resistor R6, the first end of the capacitor C6 and the first end of the resistor R7, the second end of the resistor R7 is connected with the first end of the capacitor C5, and the second end of the capacitor C5 is grounded;

[0038] The second end of the capacitor C6 is connected with the playing controller;

[0039] The positive power supply end of the operational amplifier U1 is connected with the power supply VCC1 and the first end of the capacitor C2, and the second end of the capacitor C2 is grounded;

[0040] The negative power supply end of the operational amplifier U1 is grounded. Through the specific circuit implementation and element connection relationship of the power amplifier unit, the amplification and transmission effect of the broadcast content are ensured.

[0041] Further, the equipment shell comprises a front surface, a back surface, a top surface, a bottom surface, a first side surface and a second side surface;

[0042] The front surface of the equipment shell is provided with a microphone interface;

[0043] The microphone is connected with the playing controller through the microphone interface;

[0044] The loudspeaker and the intercom button are both arranged on the front surface of the equipment shell;

[0045] The front surface of the equipment shell is further provided with a switch button, and the switch button is connected with the playing controller;

[0046] The microphone interface is arranged at the middle of the front surface of the equipment shell, close to the first side surface, the speaker is arranged at the front surface of the equipment shell, close to the second side surface and the top surface, the intercom button is arranged at the middle of the front surface of the equipment shell, and the switch button is arranged at the front surface of the equipment shell, close to the second side surface and the bottom surface.

[0047] Further, the external power supply port and the network port are arranged at the second side surface of the equipment shell, and the microphone seat is further arranged at the second side surface of the equipment shell.

[0048] The external power supply port and the network port are arranged at the lower part of the microphone seat. The external power supply port, the network port and the microphone seat are arranged at the second side surface of the equipment shell, so that the power supply and the network connection of the broadcast terminal equipment are facilitated.

[0049] From the above technical solution, the train broadcast system has the following advantages:

[0050] The train broadcast system provided by the application realizes double power supply for the broadcast terminal equipment by introducing the voltage conversion module and the battery backup system. In the case of external power interruption or instability, the battery can immediately take over the power supply, ensuring the continuous operation of the broadcast system, thereby effectively solving the safety hazard problem caused by unstable power supply in the traditional system. The addition of the echo cancellation unit in the broadcast terminal equipment effectively eliminates echo and microphone self-oscillation phenomena in the broadcast process through precise signal processing technology, significantly improving the clarity and sound quality of the broadcast content, and providing better auditory experience for passengers. The broadcast server, the repeater, the on-board controller and the broadcast terminal equipment are connected through the network, realizing digital transmission and remote control of the broadcast content. The multi-stage voltage conversion unit can provide stable power supply according to the voltage requirements of different equipment, thereby improving the overall reliability and stability of the system.

[0051] The train broadcast system of the application is suitable for urban rail transit systems such as subways and light rails, and provides a powerful guarantee for the safe operation of trains. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical scheme of the application, the following will briefly introduce the drawings needed in the description.

[0053] Figure 1 It is the overall schematic diagram of the train broadcast system of the application.

[0054] Figure 2The utility model discloses a train broadcast system's voice module schematic view.

[0055] Figure 3 The utility model discloses a train broadcast system's voltage conversion module schematic view.

[0056] Figure 4 The utility model discloses a train broadcast system's power amplifier unit schematic view.

[0057] Figure 5 The utility model discloses a train broadcast system's network module schematic view.

[0058] Figure 6 The utility model discloses a train broadcast system's equipment shell schematic view.

[0059] Main drawing mark explanation

[0060] 1, broadcast server;2, repeater;3, vehicle-mounted controller;4, broadcast terminal equipment;5, equipment shell;6, play controller;7, voltage conversion module;8, network module;9, voice module;10, battery;11, external power supply mouth;12, charge and discharge module;13, loudspeaker;14, power amplifier unit;15, echo cancellation unit;16, microphone;17, first voltage conversion unit;18, second voltage conversion unit;19, third voltage conversion unit;20, fourth voltage conversion unit;21, wireless network unit;22, network controller;23, ethernet transformer;24, network port;25, intercom button;26, switch button;27, microphone interface;28, microphone seat. Specific implementation

[0061] In the following, the train broadcast system will be described in detail, and various embodiments of the present disclosure will be described more fully. The present disclosure can have various embodiments, and adjustments and changes can be made therein. However, it should be understood that there is no intention to limit various embodiments of the present disclosure to the specific embodiments disclosed herein, but the present disclosure should be understood to cover all adjustments, equivalents and / or alternatives falling within the spirit and scope of various embodiments of the present disclosure.

[0062] Exemplarily, the train broadcast control system, which is a device widely used in urban rail transit systems such as subways and light rails, gives the station control room staff the ability to broadcast regional information to all stations on the line, which is crucial for ensuring train operation safety. However, due to the high dynamics and complex environment of train operation, the system faces multiple challenges. The primary difficulty is the instability of power supply. During the journey of the train, it will pass through different power areas and suffer from voltage fluctuations or sudden power loss. This unstable power environment will directly affect the operation of the broadcast system, which may cause the broadcast equipment to stop working, the sound quality to deteriorate, and even the equipment to be damaged. Even with power supply, fluctuations in power quality can cause equipment failure, disrupting the continuity and reliability of the broadcast service. Secondly, the volatility of the network environment poses a great challenge to the data transmission of the train broadcast system. During high-speed travel, the train will frequently experience network switching and encounter signal blind areas, which may cause the broadcast content to be delayed, interrupted, or data lost. In addition, sound signals are easily disturbed when they propagate inside the train. Some broadcast terminal devices have design flaws in the voice module, such as echo, howling, and other problems, which not only reduce the clarity of the broadcast content, but also may have a negative impact on the auditory perception of passengers.

[0063] To solve the above problems, the utility model provides a train broadcast system, which realizes double power supply for the broadcast terminal device by introducing a voltage conversion module and a battery backup system, eliminates echo and microphone self-oscillation phenomena in the broadcast process through an echo cancellation unit, and provides stable power supply according to the voltage requirements of different devices through multi-stage voltage conversion. Overall, it provides an efficient, stable, and reliable solution for the train broadcast system, which is suitable for urban rail transit systems such as subways and light rails, and provides a strong guarantee for the safe operation of trains.

[0064] Hereinafter, the term "include" or "may include" used in various embodiments of the disclosure indicates the presence of the disclosed functions, operations, or elements, and does not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the disclosure, the terms "include", "have", and their synonyms only mean to indicate the presence of a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be understood as excluding the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.

[0065] The expressions used in the various embodiments of the present disclosure, such as "first", "second", etc., can modify various constituent elements in the various embodiments, but can not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present disclosure, a first element can be referred to as a second element, and likewise, a second element can be referred to as a first element.

[0066] It should be noted that if a description connects one constituent element to another constituent element, the first constituent element can be directly connected to the second constituent element, and a third constituent element can be connected between the first constituent element and the second constituent element. Conversely, when one constituent element is directly connected to another constituent element, it can be understood that there is no third constituent element between the first constituent element and the second constituent element.

[0067] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0068] Please refer to Figure 1 Fig. 1 is a train broadcasting system in an embodiment, the system comprises:

[0069] a broadcasting server 1, a repeater 2, a vehicle-mounted controller 3 and a plurality of broadcasting terminal devices 4;

[0070] The vehicle-mounted controller 3 is connected with the broadcasting server 1 through the repeater 2;

[0071] The broadcasting terminal device 4 comprises a device shell 5, the inside of the device shell 5 is provided with a circuit board, the circuit board is provided with a playing controller 6, the playing controller 6 is connected with a voltage conversion module 7 and a network module 8;

[0072] Each broadcasting terminal device 4 is connected with the vehicle-mounted controller 3 through the network module 8;

[0073] The playing controller 6 is connected with a voice module 9, and the voice module 9 is also connected with the voltage conversion module 7;

[0074] The voltage conversion module 7 is connected with a battery 10 and an external power supply port 11, and a charge-discharge module 12 is further connected between the battery 10 and the external power supply port 11;

[0075] The external power supply port 11 is arranged on the outer side of the device shell 5.

[0076] It should be noted that the battery 10 and the external power supply ensure stable power supply of the train broadcast service, when the external power supply is stable, the train broadcast system is powered by the external power supply, and the battery is charged by the external power supply, when the external power supply is unstable or power off, the train broadcast system is powered by the battery 10.

[0077] In an embodiment of the utility model, based on voice module 9, a possible embodiment will be given below to non-restrictively explain its specific implementation scheme.

[0078] As shown in Figure 2 Voice module 9 includes loudspeaker 13, power amplifier unit 14, echo cancellation unit 15 and microphone 16;The power amplifier unit 14 can adopt the chip of LM1875 type;The echo cancellation unit 15 adopts the chip of FM1288 type;

[0079] Loudspeaker 13, power amplifier unit 14 are connected with playing controller 6, and the connecting line of playing controller 6 and loudspeaker 13 is also connected with echo cancellation unit 15;

[0080] Echo cancellation unit 15 is also connected with power amplifier unit 14 and microphone 16;

[0081] Power amplifier unit 14 and echo cancellation unit 15 are connected with voltage conversion module 7;

[0082] Loudspeaker 13, microphone 16 are arranged on the outer side of device shell 5;

[0083] Voice module 9 also includes intercom button 25, intercom button 25 is connected with playing controller 6 and is arranged on the outer side of device shell 5;

[0084] Echo cancellation unit 15 is equipped with first input end IN1, second input end IN2 and output end OUT;

[0085] First input end IN1 is connected with microphone 16, second input end IN2 is connected with resistance R8, and the other end of resistance R8 is connected with the connecting line of loudspeaker 13 and playing controller 6, and output end OUT is connected with power amplifier unit 14.

[0086] In an embodiment of the utility model, voltage conversion module 7, a possible embodiment will be given below to non-restrictively explain its specific implementation scheme.

[0087] As shown in Figure 3 Voltage conversion module 7 includes first voltage conversion unit 17, second voltage conversion unit 18, third voltage conversion unit 19 and fourth voltage conversion unit 20;

[0088] The input end of the first voltage conversion unit 17 is connected with the external power supply port 11, the output end of the first voltage conversion unit 17 is connected with the power supply VCC1 and is connected with the power amplifier unit 14 and the input end of the second voltage conversion unit 18;

[0089] The output end of the second voltage conversion unit 18 is connected with the power supply VCC2 and is connected with the sound elimination unit 15, the input end of the third voltage conversion unit 19 and the input end of the fourth voltage conversion unit 20;

[0090] The output end of the fourth voltage conversion unit 20 is connected with the positive pole of the battery 10 and is connected with the ground of the negative pole of the battery 10;

[0091] The input end of the third voltage conversion unit 19 is also connected with the positive pole of the battery 10, the output end of the third voltage conversion unit 19 is connected with the power supply VCC3 and is connected with the playing controller 6;

[0092] The first voltage conversion unit 17 converts the 220V alternating voltage of the external power supply port into 24V direct current voltage, the second voltage conversion unit 18 converts the 24V direct current voltage into 5V direct current voltage, the third voltage conversion unit 19 converts the 5V direct current voltage into 3.3V direct current voltage, and the fourth voltage conversion unit 20 converts the 5V direct current voltage into 3.7V direct current voltage.

[0093] On the basis of the above embodiment, as Figure 4 The network module 8 comprises a wireless network unit 21 and a wired network unit, the wireless network unit 21 adopts a wireless network chip of model BCM43341;

[0094] The wired network unit comprises a network controller 22, an Ethernet transformer 23 and a network port 24, the network controller adopts a chip of model RTL8111H, the Ethernet transformer 23 adopts an Ethernet transformer chip of model H81601S;

[0095] The network controller 22 is connected with the playing controller 6 and the Ethernet transformer 23;

[0096] The network port 24 is connected with the Ethernet transformer 23;

[0097] The network port 24 is arranged on the outer side of the equipment shell 5;

[0098] The wireless network unit 21 is connected with the power supply VCC2, and the network controller 22 and the Ethernet transformer 23 are all connected with the power supply VCC3.

[0099] In an embodiment of the utility model, as Figure 5 The power amplifier unit 14 will be described in a possible embodiment below.

[0100] The power amplifier unit 14 comprises an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6;

[0101] The same direction input end of the operational amplifier U1 is connected with the first end of the resistor R3 and the first end of the capacitor C3, and the reverse input end of the operational amplifier U1 is connected with the first end of the capacitor C4 and the first end of the resistor R6;

[0102] The second end of the resistor R3 is connected with the first end of the resistor R2, the first end of the capacitor C1 and the first end of the resistor R1, the second end of the resistor R1 is grounded, the second end of the capacitor C1 is grounded, and the second end of the resistor R2 is connected with the power supply VCC1;

[0103] The second end of the capacitor C3 is connected with the first end of the resistor R4 and the sound elimination unit 15;

[0104] The second end of the capacitor C4 is connected with the first end of the resistor R5, and the second end of the resistor R5 is grounded;

[0105] The reverse input end of the operational amplifier U1 is connected with the second end of the resistor R6, the first end of the capacitor C6 and the first end of the resistor R7, the second end of the resistor R7 is connected with the first end of the capacitor C5, and the second end of the capacitor C5 is grounded;

[0106] The second end of the capacitor C6 is connected with the playing controller 6;

[0107] The positive power supply end of the operational amplifier U1 is connected with the power supply VCC1 and connected with the first end of the capacitor C2, and the second end of the capacitor C2 is grounded;

[0108] The negative power supply end of the operational amplifier U1 is grounded.

[0109] In an embodiment of the utility model, as shown in Figure 6 The device housing 5 will be given a possible embodiment of the specific implementation scheme of non-limiting elaboration.

[0110] The device housing 5 comprises a front, a back, a top, a bottom, a first side and a second side;

[0111] The front of the device housing 5 is provided with a microphone interface 27;

[0112] The microphone 16 is connected with the playing controller 6 through the microphone interface 27;

[0113] The loudspeaker 13 and the intercom button 25 are arranged on the front of the device housing 5;

[0114] The front of the device housing 5 is further provided with a switch button 26, and the switch button 26 is connected with the playing controller 6;

[0115] The microphone interface 27 is arranged in the middle of the front surface of the device housing 5, close to the first side surface, the speaker 13 is arranged on the front surface of the device housing 5 close to the second side surface and the top surface, the intercom button 25 is arranged in the middle of the front surface of the device housing 5, and the switch button 26 is arranged on the front surface of the device housing 5 close to the second side surface and the bottom surface;

[0116] The external power supply port 11 and the network port 24 are arranged on the second side surface of the device housing 5, and the microphone seat 28 is arranged on the second side surface of the device housing 5;

[0117] The external power supply port 11 and the network port 24 are arranged on the lower part of the microphone seat 28.

[0118] The above description of disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A train broadcasting system, characterized in that, It includes a broadcast server (1), a repeater (2), a vehicle controller (3), and several broadcast terminal devices (4); The vehicle controller (3) is connected to the broadcast server (1) via a repeater (2); The broadcast terminal equipment (4) includes a housing (5), a circuit board is provided inside the housing (5), a playback controller (6) is provided on the circuit board, and the playback controller (6) is connected to a voltage conversion module (7) and a network module (8). Each broadcast terminal device (4) is connected to the vehicle controller (3) via a network module (8); The playback controller (6) is connected to the voice module (9), which is also connected to the voltage conversion module (7); The voltage conversion module (7) is connected to the battery (10) and the external power port (11), and a charging and discharging module (12) is also connected between the battery (10) and the external power port (11). The external power port (11) is located on the outside of the device housing (5).

2. The train broadcasting system as described in claim 1, characterized in that, The voice module (9) includes a speaker (13), a power amplifier unit (14), an echo cancellation unit (15), and a microphone (16). The speaker (13) and the power amplifier unit (14) are both connected to the playback controller (6), and the connection line between the playback controller (6) and the speaker (13) is also connected to the echo cancellation unit (15); The echo cancellation unit (15) is also connected to the power amplifier unit (14) and the microphone (16); The power amplifier unit (14) and the echo cancellation unit (15) are both connected to the voltage conversion module (7); The loudspeaker (13) and microphone (16) are both located on the outside of the device housing (5).

3. The train broadcasting system as described in claim 2, characterized in that, The voltage conversion module (7) includes a first voltage conversion unit (17), a second voltage conversion unit (18), a third voltage conversion unit (19), and a fourth voltage conversion unit (20). The input terminal of the first voltage conversion unit (17) is connected to the external power port (11), and the output terminal of the first voltage conversion unit (17) is connected to the power supply VCC1 and is connected to the input terminal of the power amplifier unit (14) and the second voltage conversion unit (18). The output of the second voltage conversion unit (18) is connected to the power supply VCC2, and is connected to the input of the echo cancellation unit (15), the third voltage conversion unit (19), and the fourth voltage conversion unit (20); The output terminal of the fourth voltage conversion unit (20) is connected to the power supply VCC4 and is connected to the positive terminal of the battery (10), while the negative terminal of the battery (10) is grounded. The input terminal of the third voltage conversion unit (19) is also connected to the positive terminal of the battery (10), and the output terminal of the third voltage conversion unit (19) is connected to the power supply VCC3 and is connected to the playback controller (6).

4. The train broadcasting system as described in claim 3, characterized in that, The first voltage conversion unit (17) converts the 220V AC voltage from the external power supply port to a 24V DC voltage. The second voltage conversion unit (18) converts the 24V DC voltage to a 5V DC voltage. The third voltage conversion unit (19) converts the 5V DC voltage to a 3.3V DC voltage. The fourth voltage conversion unit (20) converts the 5V DC voltage to a 3.7V DC voltage.

5. The train broadcasting system as described in claim 3, characterized in that, The network module (8) includes a wireless network unit (21) and a wired network unit; The wired network unit includes a network controller (22), an Ethernet transformer (23), and a network port (24). The network controller (22) is connected to both the playback controller (6) and the Ethernet transformer (23); The network port (24) is connected to the Ethernet transformer (23); The network port (24) is located on the outside of the device housing (5); The wireless network unit (21) is connected to the power supply VCC2, and the network controller (22) and the Ethernet transformer (23) are both connected to the power supply VCC3.

6. The train broadcasting system as described in claim 5, characterized in that, The voice module (9) also includes an intercom button (25), which is connected to the playback controller (6) and is located on the outside of the device housing (5).

7. The train broadcasting system as described in claim 5, characterized in that, The echo cancellation unit (15) is provided with a first input terminal IN1, a second input terminal IN2 and an output terminal OUT; The first input terminal IN1 is connected to the microphone (16), the second input terminal IN2 is connected to the resistor R8, the other end of the resistor R8 is connected to the connection line of the speaker (13) and the playback controller (6), and the output terminal OUT is connected to the power amplifier unit (14).

8. The train broadcasting system as described in claim 7, characterized in that, The power amplifier unit (14) includes an operational amplifier U1, resistors R1, R2, R3, R4, R5, R6, R7, capacitors C1, C2, C3, C4, C5, and C6. The non-inverting input terminal of operational amplifier U1 is connected to the first terminal of resistor R3 and the first terminal of capacitor C3, and the inverting input terminal of operational amplifier U1 is connected to the first terminal of capacitor C4 and the first terminal of resistor R6. The second terminal of resistor R3 is connected to the first terminal of resistor R2, the first terminal of capacitor C1, and the first terminal of resistor R1. The second terminal of resistor R1 is grounded, the second terminal of capacitor C1 is grounded, and the second terminal of resistor R2 is connected to power supply VCC1. The second terminal of capacitor C3 is connected to the first terminal of resistor R4 and the echo cancellation unit (15); The second terminal of capacitor C4 is connected to the first terminal of resistor R5, and the second terminal of resistor R5 is grounded. The inverting input terminal of operational amplifier U1 is connected to the second terminal of resistor R6, the first terminal of capacitor C6, and the first terminal of resistor R7. The second terminal of resistor R7 is connected to the first terminal of capacitor C5, and the second terminal of capacitor C5 is grounded. The second terminal of capacitor C6 is connected to the playback controller (6); The positive power supply terminal of the transport amplifier U1 is connected to the power supply VCC1 and to the first terminal of capacitor C2, while the second terminal of capacitor C2 is grounded. The negative power supply terminal of transport amplifier U1 is grounded.

9. The train broadcasting system as described in claim 6, characterized in that, The equipment housing (5) includes a front, a back, a top, a bottom, a first side, and a second side; The front of the device housing (5) is provided with a microphone interface (27); The microphone (16) is connected to the playback controller (6) via the microphone interface (27); The speaker (13) and intercom button (25) are both located on the front of the device housing (5); A switch button (26) is also provided on the front of the device housing (5), and the switch button (26) is connected to the playback controller (6); The microphone interface (27) is located in the center of the front of the device housing (5), near the first side. The speaker (13) is located in the center of the front of the device housing (5), near the second side and the top. The intercom button (25) is located in the center of the front of the device housing (5). The switch button (26) is located in the center of the front of the device housing (5), near the second side and the bottom.

10. The train broadcasting system as described in claim 8, characterized in that, The external power port (11) and network port (24) are located on the second side of the device housing (5), and a microphone socket (28) is also provided on the second side of the device housing (5). The external power port (11) and network port (24) are located at the bottom of the microphone stand (28).

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