CN111082886A

CN111082886A - Networked train broadcasting system and implementation method

Info

Publication number: CN111082886A
Application number: CN201911138500.0A
Authority: CN
Inventors: 刘伟
Original assignee: Beijing Waycom Century Technology Co ltd
Current assignee: Beijing Waycom Century Technology Co ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-04-28
Anticipated expiration: 2039-11-20
Also published as: CN111082886B

Abstract

A networked train broadcasting system and an implementation method belong to the technical field of urban rail transit vehicles and motor train units. Adopting full Ethernet topology and matching with digital multimedia terminal; the low-power consumption terminal equipment adopts POE power supply IEEE 802.3af/at technology; the switch adopts a dynamic host configuration protocol DHCP to automatically allocate the IP address of the terminal equipment; visual digital talkback is realized by adopting a VoIP technology; based on the gigabit Ethernet communication technology, an embedded processor is used as a core, a full Ethernet topology, a digital multimedia terminal and an integrated control host are adopted, three subsystems and the Ethernet are integrated, and POE power supply and DHCP technology is used for terminal equipment.

Description

Networked train broadcasting system and implementation method

Technical Field

The invention belongs to the technical field of urban rail transit vehicles and motor train units, and relates to a networked train broadcasting system and an implementation method.

Background

At present, a bus type control technology and an analog audio transmission technology are generally adopted in a vehicle-mounted broadcasting system of a subway light rail or a motor train unit; in the transmission process of the carriage, the control signals and the analog audio and video signals among the main machines of each carriage are easily interfered by the environment and other system signals; the system needs to adopt a transmission mode of network topology.

The broadcast failure rate of the prior art is high:

in a semi-automatic station reporting mode in the prior art, a broadcasting system carries out station reporting logic operation through level signal changes of a door, five kilometers and thirty kilometers, the fault rate of broadcasting station reporting is high, and the method is mainly embodied in station reporting by mistake, station not reporting, station jumping and the like, and has the following specific reasons:

software problems: the broadcast station reporting logic has BUG (BUG); MP3 playboard questions: the CF card is in poor contact, and the voice file cannot be played; abnormal input of level signals of a door, five kilometers and thirty kilometers;

system errors caused by abnormal power outages in the prior art:

the system error caused by abnormal power failure mainly has the following aspects:

a program or script startup failure; file system corruption; loss of system logs or surveillance video, etc.

The main and standby redundancy functions of the prior art are imperfect:

the currently adopted head-to-tail redundancy mechanism has the following disadvantages:

the host machine fails to use the redundant function of the tail car in the single-driver driving process; the network interruption is easy to cause double master control failures; the operation information of the host and the standby machine cannot be completely synchronized; the switching of the redundant functions is actually too slow, and the efficiency is not as efficient as that of 'restarting the host' in an emergency.

Disclosure of Invention

The invention solves the technical problems in the prior art, and provides a networked train broadcasting system and an implementation method.

The problems in the prior art are solved by the following technical scheme:

a method for realizing networked train broadcasting comprises the following steps;

OCC (operation control center) artificial broadcasting step: the control center OCC can be wirelessly accessed to a PIS (passenger information) system through a vehicle and a ground in the operation process to manually broadcast passengers;

and (3) manual broadcasting: a driver directly triggers an 'artificial broadcast' function by pressing a PTT (push-to-talk) key of a console or handheld microphones on the side walls on the two sides;

OCC emergency broadcast step: in a full-automatic driving mode, when a train encounters an emergency, a fire disaster or a serious fault occurs, the control center OCC can be wirelessly accessed to the PIS system through the train and the ground in the operation process to carry out emergency broadcasting on passengers;

an emergency broadcasting step: when a train encounters an emergency, a fire disaster occurs and a serious fault occurs, a driver operates a PISM (passenger information system display), and emergency broadcasting operation broadcasts a voice file which is recorded in advance by a PISC (passenger information system controller) at a main control end and contains contents such as 'command persuasion' or 'apology pacification' to a passenger;

a full-automatic station reporting step: in a full-automatic station reporting mode, a PISC in a master control state receives an ATO (automatic train operation device) station reporting control instruction forwarded by a TCMS (train control and management system), and performs 'departure station reporting' or 'arrival station reporting' on passengers according to a preset station reporting logic, wherein the station reporting content is a digital voice file which is recorded in advance and stored in the PISC;

a standby broadcasting step: the independent analog audio bus, the analog handheld microphone and the loudspeaker are arranged to form a whole set of standby broadcasting scheme, and when the digital broadcasting function cannot work normally, the driver cab shouts a passenger room through the standby microphone to complete the manual broadcasting function;

a driver presses a PTT side key of an MIC (microphone), key signals are collected by an analog power amplifier, and each analog power amplifier device is controlled by a vehicle audio bus to open an audio processing channel; each passenger room simulates a power amplifier to connect audio to a loudspeaker line of the passenger room at ordinary times, and a driver shouts the passenger room through a microphone to finish the function of artificial broadcasting; the audio channel is disconnected after the PTT side key of the MIC is released;

semi-automatic station reporting: in a semi-automatic station reporting mode, the PISC in a master control state carries out 'departure station reporting' or 'arrival station reporting' on passengers by collecting signals provided by a train, and the station reporting content is a digital voice file which is pre-recorded and stored in the PISC;

OCC manual station reporting step: in a full-automatic driving operation mode without multiplying by people, manually assigning station reporting contents by the OCC, starting or stopping station reporting by the PISC in a master control state according to station reporting codes provided by the OCC, wherein the station reporting contents are digital voice files which are recorded in advance and stored in the PISC;

manual station reporting: the driver appoints the stop announcement content through the PISM interface, the PISC starts or stops the stop announcement in the master control state according to the stop announcement code provided by the PISM, and the stop announcement content is a digital voice file which is pre-recorded and stored in the PISC.

A networked vehicle-mounted broadcasting system adopts full Ethernet topology and is matched with a digital multimedia terminal; the low-power consumption terminal equipment adopts POE power supply IEEE 802.3af/at technology; the exchanger adopts a dynamic host configuration protocol DHCP (dynamic host configuration protocol) to automatically distribute the IP address of the terminal equipment; visual digital talkback is realized by adopting VoIP (voice over Internet protocol) technology; based on the gigabit Ethernet communication technology, an embedded processor is used as a core, a full Ethernet topology, a digital multimedia terminal and an integrated control host are adopted, three subsystems and the Ethernet are integrated, and POE power supply and DHCP technology is used for terminal equipment.

Based on the Ethernet construction, all terminal equipment is digitalized and connected into the Ethernet; the system host PISC should adopt a three-layer switch, the CCU (carriage controller) adopts a two-layer switch, and the terminal equipment is all digitalized and connected to the Ethernet; the train-level Ethernet adopts a gigabit network and supports two networking modes of link aggregation or ring topology; all terminals in the digital PIS adopt Ethernet communication, and all the terminals preferentially adopt DHCP to carry out IP setting and power supply adopts network cables to supply power in consideration of wiring and debugging of the system; the passenger room LCD display and the passenger guidance display (TGS) are distributed on two sides of the carriage and are cascaded in a hand-in-hand mode, two Ethernet interfaces are required to be arranged on a single terminal device, and the two interfaces have Bypass functions.

The invention has the advantages that the system architecture is simpler by adopting full Ethernet topology and matching with a digital multimedia terminal, and the state of each device can be monitored on line in real time; the low-power consumption terminal equipment adopts a POE power supply (IEEE 802.3af/at) technology, so that the wiring is simplified, and the cost is saved; the switch adopts a Dynamic Host Configuration Protocol (DHCP), automatically allocates the IP address of the terminal equipment, and simplifies the debugging and maintenance difficulty.

The invention upgrades the defects of the prior art:

first, reduce the fault rate of broadcasting station reporting error

1) Planning and designing a station reporting logic from the top layer, and simultaneously combining the station reporting logic of the existing stable operation project;

2) the high-performance embedded processor is adopted, an audio playing chip is integrated on the board card, the inter-board communication is omitted, the on-board storage is supported, and the card seat is prevented from being plugged;

3) the method of using the door signal and the speed signal is considered, the driving distance is calculated through the speed signal, the influence of signal jitter is not easy to be caused, the door signal is still needed to carry out state switching, and the phenomenon of early station reporting or station failure can still occur when the speed signal is acquired abnormally or the communication is abnormal.

Second, improve the master-slave redundant function

The digital PIS adopts a scheme of a two-stage redundancy mechanism:

primary redundancy: the system PISC host computer is provided with a main CPU module and a standby CPU module to realize the redundancy of the local terminal;

the system PISC host computer is provided with a main CPU module and a standby CPU module to realize local redundancy, when the main CPU board card breaks down, the system is automatically switched to a second CPU board card to work, and after the switching, the manual broadcasting station reporting and the talkback functions at the head end and the tail end can be normally used. Under normal conditions, a real-time data synchronization function is provided between the main board card and the standby board card.

Secondary redundancy: the PISC hosts at two ends of the system can be manually switched from master to slave, so that the redundancy of the tail end is realized:

when the system runs in the condition of primary redundancy, a redundant CPU has a problem, or the PISM cannot detect the state of the PISC host at the activation end, the PISM sends a prompt to a driver, the driver can manually switch the current active PISC host through the PISM, and the main PISC host and the secondary PISC host have a real-time data synchronization function. When the PISC host at the activation end fails (one CPU fails or a network fails), the system prompts a driver to switch to the PISC for operation. After the secondary redundancy is switched, the functions of artificial broadcasting and broadcasting station reporting can still be realized at the fault end, but the monitoring function cannot be realized.

Thirdly, reducing video loss caused by power failure or system error

The video storage is divided into two storage modes of centralized storage and distributed storage. Aiming at the centralized storage mode, by adding a local video storage of the camera, when the hard disk mounting fails or the program is wrong, the camera can realize the local storage function; aiming at the distributed storage mode, each section of passenger room storage module can store the monitoring videos of the passenger room and the adjacent passenger room, and when the passenger room video storage module cannot work normally, the video storage module of the adjacent passenger room can continuously store the video of the camera, and the two modules do not influence each other.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts; as shown in the figure:

FIG. 1 is a schematic structural view of the present invention;

the invention is further illustrated with reference to the following figures and examples.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1: as shown in fig. 1, in a networked car-mounted broadcasting system, a train broadcasting and passenger information processing module is connected to an exchange extension module, an MVB (multifunction vehicle bus) communication module, a level signal acquisition processing module, a marshalling network exchange module, a digital audio forwarding, storing and multicasting module, a video storage module and an audio processing module, and a power supply module is connected to the modules.

The ground PIS module and the OCC module are respectively connected with the switch extension module through a hundred mega Ethernet, the TCMS module is connected with the MVB communication module through a TCU (TCMS communication unit), the train level signal (DC110/24V) module is connected with the level signal acquisition and processing module through a main control signal, a door closing signal, a zero-speed signal and a thirty kilometer signal, and the train power supply module supplies DC110V to the power supply module.

The PIS operation screen PISM is connected with the marshalling network switch module through a gigabit Ethernet X1, the compartment controller CCU is connected with the marshalling network switch module through a gigabit Ethernet X2, the cab camera is connected with the digital audio forwarding, storing and multicasting module through a gigabit Ethernet X3, the terminal screen display is connected with the video recording and storing module through a gigabit Ethernet X1, the microphone/OCC is connected with the audio processing module through analog audio input, and the loudspeaker is connected with the audio processing module through analog audio output.

A networked vehicle-mounted broadcasting system and a realization method are provided, wherein a full Ethernet topology is adopted and matched with a digital multimedia terminal; the low-power consumption terminal equipment adopts a POE power supply (IEEE 802.3af/at) technology; the switch adopts a Dynamic Host Configuration Protocol (DHCP) to automatically allocate the IP address of the terminal equipment; visual digital talkback is realized by adopting a VoIP technology; based on the gigabit Ethernet communication technology, the embedded processor is used as a core, a full Ethernet topology, a digital multimedia terminal and an integrated control host are adopted, three subsystems and the Ethernet are integrated, the system architecture is simplified, the terminal equipment uses the POE power supply and DHCP technology, and the difficulty of system design, development, construction, debugging and maintenance is reduced;

based on the Ethernet construction, all terminal equipment is digitalized and connected into the Ethernet; the system host PISC should adopt a three-layer switch, the CCU adopts a two-layer switch, and the terminal equipment is completely digitalized and connected to the Ethernet; the train-level Ethernet adopts a gigabit network and supports two networking modes of link aggregation or ring topology; all terminals in the digital PIS adopt Ethernet communication, and all the terminals preferentially adopt DHCP to carry out IP setting and power supply adopts network cables to supply power in consideration of wiring and debugging of the system; the passenger room LCD display and the passenger guidance display (TGS) are distributed on two sides of the carriage and are cascaded in a hand-in-hand mode, two Ethernet interfaces are required to be arranged on a single terminal device, and the two interfaces have Bypass functions; the vehicle-mounted broadcasting system is divided into functions on the basis of terminal equipment, and mainly comprises the functions of broadcasting station reporting, talkback communication, information display, video storage, monitoring query and the like; when the system normally operates, the main control end PISC is mainly used for working, and the slave control end PISC is in a hot standby state and mainly used for data synchronization.

A networked vehicle-mounted broadcasting system comprises the following steps;

OCC manual broadcasting step: the control center OCC can be wirelessly accessed to the PIS system through a vehicle and a ground in the operation process to manually broadcast passengers;

step 1, the control center OCC is connected with the PISC through the Ethernet, and sends an OCC artificial broadcast control instruction to the PISC at two ends;

step 2, after receiving the control instruction, the PISC switches the broadcast mode to an OCC manual broadcast state, and interrupts playing the current broadcast content;

step 3, the PISC sends the artificial broadcast digital signal sent by the OCC to the CCU of the guest room through the Ethernet;

step 4, after receiving the digital audio signal and carrying out digital power amplification, the CCU drives a loudspeaker of the guest room to play;

and 5, after the artificial broadcast language is played, the control center OCC sends a command for canceling the artificial broadcast control, and the PISC broadcast mode of the main control end is restored to the state before the artificial broadcast is executed.

And (3) manual broadcasting: a driver directly triggers an 'artificial broadcast' function through a control console or PTT keys of handheld microphones on the side walls on the two sides; comprises the following steps;

step 1, a driver directly triggers an artificial broadcast function by operating a console or microphones on side walls at two sides and long-pressing a PTT key for more than 2S;

step 2, after receiving the 'artificial broadcast' instruction, the PISC at the main control end switches the broadcast mode to an OCC artificial broadcast state and interrupts playing of the current broadcast content;

step 3, the hand-held MIC converts the collected voice signal into a digital audio signal through PCM (pulse code modulation) modulation;

step 4, the PISC sends the artificial broadcast audio signal sent by the OCC to the CCU of the guest room through the Ethernet;

step 5, after receiving the digital audio signal and carrying out digital power amplification, the CCU drives a loudspeaker of the guest room to play;

and 6, automatically cutting off the 'artificial broadcasting' function when the driver releases the PTT key 2S, and restoring the PISC broadcasting mode of the main control end to the state before the 'artificial broadcasting' is executed.

OCC emergency broadcast step: in a full-automatic driving mode, when a train encounters an emergency (such as a fire, a serious fault and the like), the control center OCC can be wirelessly accessed to the PIS system through the train and the ground in the operation process to carry out emergency broadcasting on passengers; comprises the following steps;

step 1, the control center OCC is connected with the PISC through the Ethernet, and an OCC emergency broadcast control instruction is sent to the PISC at two ends;

step 2, the PISC receives the operation instruction, and switches the broadcast mode to an OCC emergency broadcast state by judging the broadcast priority and the broadcast volume level;

the PISC decodes the corresponding emergency broadcast voice file and sends the decoded emergency broadcast voice file to the CCU of the guest room through the Ethernet;

and the CCU decodes the digital audio signal after receiving the digital audio signal, and the decoded audio signal is broadcasted after being processed by an analog channel.

An emergency broadcasting step: when the train encounters an emergency (such as a fire disaster, a serious fault and the like), a driver can operate the PISM, and the emergency broadcast operation broadcasts a voice file which is recorded in advance by the PISC at the main control end and contains the contents of 'command persuasion' or 'apology pacification' and the like to passengers; comprises the following steps;

step 1, entering an emergency broadcast sub-interface through PISM operation, and selecting a corresponding emergency broadcast item to confirm playing;

step 2, the PISC receives the operation instruction and judges the broadcast priority and the broadcast volume level;

step 3, the PISC decodes the corresponding emergency broadcast voice file and sends the decoded emergency broadcast voice file to the CCU of the guest room through the Ethernet;

and 4, decoding the digital audio signal received by the CCU, and broadcasting the decoded audio signal after the decoded audio signal is processed by an analog channel.

A full-automatic station reporting step;

in a full-automatic station reporting mode, the PISC in a master control state receives an ATO (automatic train operation) station reporting control instruction forwarded by the TCMS, and performs 'departure station reporting' or 'arrival station reporting' on passengers according to a preset station reporting logic, wherein the station reporting content is a digital voice file which is recorded in advance and stored in the PISC; comprises the following steps;

step 1, selecting a full-automatic station reporting mode (ATO) by operating PISM;

the method comprises the steps that a main control end PISC receives a real-time signal sent by a TCMS, analyzes and generates a station broadcasting control and voice file calling instruction, and simultaneously judges the priority and the volume level of broadcasting station broadcasting;

step 2, the PISC decodes the corresponding 'departure stop reporting' and 'arrival stop reporting' voice files, and sends the decoded voice files to the passenger room CCU through the Ethernet;

and 3, decoding the digital audio signal received by the CCU, and broadcasting the decoded audio signal after the decoded audio signal is processed by an analog channel.

A standby broadcasting step: the independent analog audio bus, the analog handheld microphone and the loudspeaker are arranged to form a whole set of standby broadcasting scheme, and when the digital broadcasting function cannot work normally, the driver cab can call the passenger room through the standby microphone to complete the manual broadcasting function;

a driver presses a PTT side key of the MIC, a key signal is acquired by the analog power amplifier, each analog power amplifier device is controlled by a vehicle audio bus, and an audio processing channel is opened; each passenger room simulates a power amplifier to connect audio to a loudspeaker line of the passenger room at ordinary times, and a driver can shout to the passenger room through a microphone to finish the function of artificial broadcasting; the audio channel is disconnected after the PTT side key of the MIC is released.

Semi-automatic station reporting: in a semi-automatic station reporting mode, the PISC in a master control state carries out 'departure station reporting' or 'arrival station reporting' on passengers by collecting signals provided by a train, and the station reporting content is a digital voice file which is pre-recorded and stored in the PISC; comprises the following steps;

step 1, a train signal system sends head/tail, vehicle door closing, zero speed, thirty kilometers or mileage and speed signals to a master control side PISC in real time;

step 2, the PISC collects the signals to judge the current running state of the train, analyzes and generates a station reporting broadcast control instruction according to preset station reporting logic, and judges the broadcast priority and the broadcast volume level at the same time;

step 3, the PISC decodes the corresponding 'departure stop reporting' and 'arrival stop reporting' voice files, and sends the decoded voice files to the passenger room CCU through the Ethernet;

OCC manual station reporting step: in a full-automatic driving operation mode without multiplying by people, the OCC can manually specify the station reporting content, the PISC in a master control state starts or stops station reporting according to the station reporting code provided by the OCC, and the station reporting content is a digital voice file which is pre-recorded and stored in the PISC; comprises the following steps;

step 1, in a full-automatic driving mode, the OCC sends a station reporting broadcast control instruction to a main control end PISC through an Ethernet;

step 2, after receiving the station broadcasting control command, the PISC at the main control end analyzes and generates a station broadcasting control and voice file calling command, and judges the priority and the volume level of broadcasting station broadcasting at the same time;

step 3, the PISC decodes the corresponding 'departure and arrival reporting' voice files, and sends the decoded voice files to the CCU of the guest room through the Ethernet;

Manual station reporting: a driver can specify the stop announcement content through a PISM interface, the PISC starts or stops the stop announcement in a master control state according to stop announcement codes provided by the PISM, and the stop announcement content is a digital voice file which is pre-recorded and stored in the PISC; comprises the following steps;

step 1, manually selecting train running intervals, running directions, station information and station reporting time by carrying out corresponding operation on PISM, and generating a broadcast control instruction to be sent to a master control end PISC through Ethernet;

The broadcast priority levels are ranked from high to low as follows:

(1) OCC artificial broadcast;

(2) OCC emergency broadcast;

(3) OCC manual station reporting;

(4) manual broadcasting;

(5) emergency broadcasting;

(6) manual station reporting;

(7) full automatic station broadcasting (ATO);

(8) semi-automatic station reporting; the talkback priority is arranged from high to low according to the following sequence:

1) the OCC talkbacks with passengers in an emergency;

2) the driver and the passenger talkback in an emergency;

3) and the driver talkbacks with the driver.

Because the manual broadcasting and the intercom system use the same hand-held microphone, the priority of realizing the two functions needs to be considered; wherein, the priority of artificial broadcast and driver's talkback can be set as:

1) manual broadcasting is preferred;

2) the driver has the priority of talkback;

3) and the same grade.

Broadcast station reporting priority: the broadcasting and broadcasting station reporting functions can be divided into different priority levels, high-level broadcasting or broadcasting station reporting can interrupt low-level broadcasting or broadcasting station reporting, when a high-level communication requirement comes, the broadcasted low-level communication is interrupted immediately, low-level broadcasting or broadcasting station reporting can not interrupt high-level broadcasting or broadcasting station reporting, and the broadcasting and broadcasting station reporting functions can be triggered only after the high-level broadcasting or broadcasting station reporting is finished; the broadcast priority judgment is realized through broadcast control software, the software presets priority judgment logic, and after receiving a broadcast instruction, the corresponding operation is executed after the priority is judged through the preset logic.

Automatic volume adjustment: the digital PIS can acquire a passenger room noise value through a passenger room emergency alarm or a noise detection device, and perform corresponding operation according to the acquired noise value to realize automatic regulation of the station reporting audio output volume, wherein the passenger room loudspeaker output volume is always 5-10 dB higher than the indoor noise, but the loudspeaker output volume is not higher than 95dB at any time;

the automatic adjustment of the volume is executed by the guest room equipment, and each guest room adjusts the volume according to the noise value of the guest room; comprises the following steps;

step 1, a system collects real-time noise conditions in a carriage through a passenger emergency alarm in a passenger room, the alarm converts an analog noise signal into a digital noise value through audio processing and operation, and sends the noise value to a CCU;

step 2, after the CCU receives the noise value, the station reporting volume value sent by the PISC is adjusted according to the preset corresponding relation between the noise value and the output volume value;

and 3, controlling and outputting the station reporting audio by the CCU according to the adjusted volume value and playing the station reporting audio through a passenger room loudspeaker.

Volume configuration: the system-related volume can be set by the PTU (portable test unit); the volume to be set mainly comprises:

automatically broadcasting volume; artificial broadcast volume; OCC broadcast volume; media sound volume; monitoring the volume of the guest room; the volume of the talkback loudspeaker; MIC volume of talkback; MIC volume of an alarm; the volume of the horn of the alarm.

Broadcast station reporting and monitoring: in order to facilitate the driver to know whether the broadcasting state in the passenger room is normal, the driver/OCC/BCC can monitor the station broadcasting, the artificial broadcasting and the OCC broadcasting in the passenger room, and the media accompanying sound playing should not be in the monitoring range.

OCC and passenger emergency talkback step: under an unattended automatic driving mode, when an emergency or an emergency occurs in a passenger room, a passenger can press an alarm button of the emergency alarm in the passenger room according to the instruction on the emergency alarm and realize talkback communication with an OCC control center through an internal talkback device beside the button; comprises the following steps;

step 1, a passenger initiates a request for communicating with a driver by triggering an alarm key of an emergency alarm (PEI);

step 2, the PEI sends an alarm instruction to the CCU through the Ethernet bus;

step 3, after receiving the alarm instruction, the CCU sends the call request instruction to the PISC (master control side) through the Ethernet bus after processing;

step 4, after receiving the call request instruction, the host side PISC comprehensively judges all current alarm information, sorts the alarm information according to time sequence, and then sends the alarm call request to the PISM through Ethernet communication; PISC sends the alarm call request to OCC control center

Step 5, the PISM pops up an alarm picture on a display screen after receiving the alarm call request instruction;

step 6, the OCC carries out connection (or hangup) operation and sends an operation instruction to the main control end PISC;

step 7, after receiving the alarm connection (or hang-up) instruction, the PISC at the main control end processes the alarm connection (or hang-up) instruction and sends the alarm connection (or hang-up) instruction to the CCU through the Ethernet bus;

step 8, after receiving the alarm connection instruction, the CCU of the carriage where the alarm which gives an alarm first is located establishes an audio channel, and simultaneously sends an indicator lamp control instruction to the PEI, so that full-duplex communication can be carried out between the PEI and the PISC of the main control end;

step 9, the CCU corresponding to the PEI in the queuing state sends a call busy instruction to the PEI, and a PEI busy indicator lamp is lightened;

and step 10, hanging up through 0CC or resetting the PEI to finish the current call, and the system connects the next queuing alarm according to the flow until all alarms triggering the alarm are hung up.

A driver and passenger emergency intercom step: under the driver value riding and driving mode, when an emergency or an emergency occurs in a passenger room, a passenger can press an alarm button of the emergency alarm in the passenger room according to the instruction on the emergency alarm, and the built-in intercom device beside the button realizes intercom communication with a driver; comprises the following steps;

step 1, a passenger initiates a request for communicating with a driver by triggering an alarm button of an emergency alarm PEI;

step 2, the PEI sends an alarm instruction to the CCU through the Ethernet bus;

step 4, after receiving the call request instruction, the MCU at the master control side comprehensively judges all current alarm information, sorts the alarm information according to the time sequence, and then sends the alarm call request to the PISM through Ethernet communication;

step 6, operating and switching on the alarm by the PISM, and sending an alarm switching-on instruction to the PISC of the main control end by the PISM;

step 7, the main control end PISC processes the alarm connection instruction after receiving the alarm connection instruction and sends the alarm connection instruction to the CCU through the Ethernet bus;

and step 10, hanging up the PISM or resetting the PEI to finish the current call, and connecting the next queuing alarm by the system according to the flow until all alarms triggering the alarm are connected.

A driver and driver intercommunication step: drivers' cabs at two ends of the train can carry out full-duplex voice communication through handheld microphones, and the master control end or the slave control end can initiate or finish talkback; after one party initiates the talkback, the other party can directly carry out the conversation without confirmation; when the train carries out digital voice automatic broadcasting, the driver communication talkback function can still be normally realized; comprises the following steps;

step 1, operating and triggering talkback on PISM;

step 2, the PISM sends an intercom instruction through an Ethernet bus;

step 3, the PISC at the talkback initiating side sends a talkback calling instruction to the PISC at the opposite side through the Ethernet bus;

step 4, the opposite side PISC receives the talkback calling instruction, judges the broadcast priority and the talkback volume level and establishes an audio channel;

step 5, PISCs at two ends of the train respectively encode and decode MIC audio signals of talkbacks at the two ends, and full-duplex talkback conversation is realized through Ethernet transmission;

step 6, operating any PISM to end the talkback and conversation;

and 7, transmitting the talkback ending instruction through the same path as the talkback request, and disconnecting the audio channel.

And (3) talkback recording: when the talkback function is activated, the system automatically records and stores the conversation content in the talkback process, and the recorded voice file can be downloaded and played through special software or tools; comprises the following steps;

step 1, when the talkback function is activated, the master PISC automatically acquires talkback audio signals and records voices;

step 2, naming the voice file according to a corresponding rule and storing the voice file into a main control terminal PISC;

and 3, downloading and playing back the recording file by using the Ethernet to connect the PISC/CCU through the PTU tool.

A networked vehicle-mounted broadcasting system is characterized in that one PISC is respectively installed in a cab at the head and the tail of a vehicle, one PISC is defaulted to work and is a master control end, and the other PISC is hot standby and is a slave control end; comprises the following steps;

step 1, under normal conditions, only one end of a driver cab PISC is in a master control state, the master control state is determined by that the local end PISC receives effective operation, the effective operation is only limited to two types, namely PISM touch operation and train head and tail signal key activation, wherein the key activation priority is greater than that of the PISM touch operation;

step 2, when the drivers' cab PISCs at the two ends do not receive the head-tail signal activation state, the system is powered on and defaults that the PISC at the TC1 end is a system master control end and the PISC at the TC2 end is a slave control end, when the communication of the two ends is normal, the master control state of the PISCs at the two ends can be switched through the PISM operation at the two ends, the master control end PISC sends the master control state to the PISC at the other end, and the PISC at the other end becomes the slave control end; when the communication between the two ends is interrupted, the PISC capable of normally communicating with the PISM can be switched to the master control end through the PISM, and the PISC incapable of normally communicating with the other end is kept unchanged until the next effective operation (through PISM switching or head-to-tail signal activation) is carried out;

step 3, when the drivers 'cab PISC at the two ends receives the head and tail signal activation state, only the drivers' cab PISC at the end receiving the head and tail signal activation state is taken as a master control end, after the head and tail signals disappear, the master control state disappears, and the master control end automatically becomes a slave control end; when the two-end communication is normal, the master control end PISC sends the master control state to the other end PISC, and the other end PISC becomes a slave control end and cannot "rob" the master control state; when the two-end communication is interrupted, the head and tail signal receiving activating end is the master control end, and the head and tail signal non-receiving activating end is the slave control end until the next effective operation (through PISM switching or head and tail signal activation).

A networked in-vehicle broadcast system comprising a terminal information display: the terminal station display screen (EDD) is positioned at the top end of the head and the tail of the train and used for prompting the terminal station information of the train operation to passengers waiting for the train at the platform; comprises the following steps;

step 1, performing corresponding operation on a master control end PISC through PISM/OCC to set a train running interval;

step 2, the PISC sends the terminal station information (Chinese character zone bit code) to the EDDs at the two sides;

and 3, receiving and displaying the EDDs on the two sides according to the instructions.

A networked vehicle-mounted broadcast system comprising a stop information display: the information display screens (BID) outside the train are positioned at the two sides outside the train and used for prompting the information of the next station for the operation of the train to the passengers at the station; the in-car Information Display Screens (EIDs) are positioned at two ends in the car and display station broadcasting voice words or emergency messages for passengers in the car; comprises the following steps;

step 2, the PISC at the main control end sends station reporting information (Chinese character zone bit codes) to the BID/EID;

and 3, receiving and displaying the BID/EID according to the instruction.

A networked in-vehicle broadcast system comprising a map information display: the train operation prompting system comprises a passenger guidance display (TGS) and a passenger guidance display (PISC), wherein the TGS is arranged above a door of a passenger room and used for prompting train operation information to passengers in the passenger room, and the TGS receives operation information sent by the PISC and displays the operation information according to instructions; interface information of the TGS can be stored in a local device, and remote batch updating is carried out through a network; or in the PISC, the TGS is responsible for decoding and displaying, and only the interface stored in the host needs to be updated during updating.

The map information display mainly comprises the following contents:

a train running section;

the running direction of the train;

the direction of the next station door opening side of the train;

the information of the current station and the next station of the train operation;

the arrival time of the front station;

a networked vehicle-mounted broadcasting system comprises train transfer stations and transfer line information, and comprises the following steps;

step 1, operating a master control end PISM through PISM/OCC to set a train running interval, a train running direction, station information and a door opening side direction;

step 2, the PISC at the main control end is combined with the current running state of the train to judge and generate a control instruction required by TGS display, the control instruction is sent to the CCU of the passenger room through the Ethernet, and the CCU forwards the control instruction to the TGS;

and 3, performing corresponding indication after the TGS receives the control command.

A networked in-vehicle broadcast system comprising a media information display: the media playing comprises network playing and local playing; comprises the following steps;

(1) network playing:

the system is started to default to a network playing mode, a guest room LCD display screen plays video images input by the ground PIS system, and meanwhile, a guest room loudspeaker plays media accompanying sound corresponding to the video files;

(2) local playing:

when the control center is in fault or network communication is interrupted and the system detects illegal intrusion, the system automatically switches to a local play mode, and the PISC directly transmits a digital film source prestored in the hard disk to the guest room LCD display through the Ethernet in an audio and video stream mode.

A networked in-vehicle broadcast system comprising an operational information display: the passenger room LCD display screen station service information display area is used for displaying train running lines, train running directions, station information of a starting station, a terminal station and a next station, transfer information and other service information; the station announcement information text prompt area can scroll and display the station announcement or emergency broadcast contents in a text form; comprises the following steps;

step 2, the PISC at the main control end is combined with the current running state of the train to judge and generate a control instruction required by LCD display, the control instruction is sent to the CCU of the passenger room through the Ethernet, and the CCU forwards the control instruction to the LCD;

and 3, carrying out corresponding indication by the LCD after receiving the control instruction.

A networked vehicle-mounted broadcasting system comprises an OCC emergency message issuing unit: when OCC sends out the emergency text information, the LCD display in the passenger room can be automatically switched, the emergency text information is issued in a full screen mode, and the original playing can be automatically recovered after the emergency information is released.

A networked in-vehicle broadcast system comprising a video store: the real-time video images of all channels can be stored in a storage medium of a video monitoring server in a specified format and a specified path while being displayed, and are named according to a certain rule; the storage capacity of the storage medium is required to meet the storage requirement of monitoring videos of all channels of the whole vehicle for more than 90 days, and the storage of the video images is performed in a circulating covering mode; the video files in the storage hard disk can be downloaded by using a PTU tool on a PISC/CCU network interface.

A networked vehicle-mounted broadcasting system comprises vehicle-mounted real-time monitoring: the PISM at the two ends can display the monitoring video of the cab or any carriage in real time, and can realize switching between a single picture and four pictures, and polling or manual channel selection display; comprises the following steps;

step 1, an IPC (Internet protocol camera) converts an image signal of a monitoring area into a digital signal, and then the digital signal is encoded and compressed to form a digital video stream; transmitting the digital video stream to PISC/CCU of each driver cab/passenger room through Ethernet;

step 2, the PISC/CCU receives the digital video stream from the Ethernet and sends the digital video stream to the PISM at the two ends;

step 3, the PISM at the two ends decodes the received digital video stream to generate a video image and display the video image on a PISM display screen;

and 4, switching between single-picture display and four-picture display, polling pictures and stopping polling by PISM operation.

A networked vehicle-mounted broadcasting system comprises an OCC real-time monitoring unit: the video pictures can be transmitted to a ground control center (OCC/BCC/TCC/station comprehensive control and the like) in real time, and the ground control center can view video images in real time; under the full-automatic driving mode, when the system triggers to give an alarm, the alarm picture is wirelessly sent to the OCC through the train and the ground, so that the OCC can conveniently check the alarm picture in real time.

A networked vehicle-mounted broadcasting system comprises a vehicle-mounted video query: the digital PIS can inquire the video recording through the driver cab PISM, and the retrieved video can be used for video playback; and the video retrieval interface can be accessed through the PISM touch operation on the two ends, and the recorded video file can be retrieved and played back.

A networked vehicle-mounted broadcasting system comprises an OCC video record query: when the ground control center (OCC/BCC/TCC and the like) terminal inquires the video recording, the PISM processes the inquiry request, and the searched video can be used for video playback and video downloading.

A networked vehicle-mounted broadcast system comprising an alarm linkage: when a passenger triggers an emergency alarm to be switched on, a video picture of the PISM is automatically switched to a carriage where an alarm event is located and a camera channel on the same-position side of the switching-on alarm; when linkage triggering is carried out, the recording speed of 8 frames per second of the video images of the two channels of the alarm carriage is converted into the recording speed of 25 frames per second, the video images within 10 minutes before the alarm event occurs in the hard disk buffer area are recorded in the hard disk event area at the speed of 25 frames per second, and naming is carried out according to a certain naming rule; after the alarm event is finished, the video image still needs to be stored for 10 minutes at the speed of 25 frames per second; the related video recording of the alarm event is stored for at least 72 hours;

and after the alarm is switched on, the PISC receives the alarm information and then realizes the functions of switching the video image display channel and converting the frame rate of the stored image.

A networked in-vehicle broadcast system comprising data records: comprises the following steps;

step 1, in order to judge that the fault occurring in the actual operation process of the system is caused by the problem of the system or the misoperation of a driver, the system should be capable of recording the relevant operation performed on the system and storing the relevant operation in a text form;

step 2, in order to facilitate the definition of the fault reason, the system should be capable of recording and storing the communication data of an external system, which mainly comprises the communication data between a train level signal and TCMS, OCC, ground PIS and the like;

step 3, the system records and stores the communication data between the internal main equipment so as to facilitate system troubleshooting and communication mechanism perfection;

and 4, the data recording function requires that the time synchronization of the related equipment in the system is kept, so the system design fully considers and realizes the function of time calibration between the main equipment of the system.

A networked in-vehicle broadcast system comprising automatic allocation of IP addresses: for terminal equipment directly connected to a backbone network of the system, IP addresses are automatically allocated by using DHCP, wherein the IP addresses comprise PISM, PAU, EDD, CAM and other equipment; for the host equipment PISC, CCU and the like, the IP address is determined through an equipment address dial switch or an address short line.

For terminal equipment connected through a branch network, an IP address is determined through an equipment address dial switch or an address short line, and the IP address comprises an LCD, a TGS, an EID, a BID and the like.

A networked in-vehicle broadcast system comprising device status detection: and checking the fault conditions of each sub-device of the PIS system through PISM data communication at two ends, wherein the fault conditions comprise an online state, a software and hardware version, fault records and the like, and when a device fails, the PISC generates fault information and sends the fault information to the PISMs at the two ends for displaying.

After the system is powered on, all host devices have a power-on self-diagnosis function, and fault information is automatically sent to the two end PISC hosts.

And entering a state detection sub-interface by operating the two ends of the PISM.

The 'online status', 'software version', 'hardware version', 'fault record' or 'repair notes' are selected to view the status of the devices.

A networked vehicle-mounted broadcasting system comprises the following sub-components and basic parameters.

Passenger Information System Controller (PISC)/guest room Communication Controller (CCU), the PISC/CCU adopts 19 inches 3U European standard machine case, two kinds of products are unified to plan, will broadcast, media, control and switch are integrated, each unit adopts the modularized design in the product, considers the reusability of unit, and realizes different product functions through configuring different backplanes and units.

LCD display:

the LCD display comprises a passenger information system operation screen (PISM), a passenger guidance information display (TGS) and a passenger room media television (LCD); the PISM is located in a cab console, is an operation terminal of the PIS system, is used for performing operation control and display functions on a system host (PISC), and the TGS and the LCD are located in a passenger compartment, are display terminals of the PIS system, and are used for providing train operation information and the like for passengers.

Passenger information system operation screen (PISM):

PISM integrates the functions of the broadcast control box and the video monitoring display of the prior project, and is an operation terminal for controlling and setting the passenger information system; the equipment is arranged on control platforms of the drivers' cab at two ends of the train, and functions of communicating, talkbacking, broadcasting, station reporting, monitoring, inquiring and the like of the drivers can be realized through PISM touch operation; meanwhile, a PISM display interface can display the current running state of the train, monitoring images, relevant operation and running states of system equipment, and a 14-inch display screen and a touch screen are adopted in the PISM.

Ride-guide information display (TGS):

the TGS is used for indicating station information to passengers, and comprises a running direction, a front station, a terminal station and a door opening side prompt lamp; the TGS is connected to the switch unit of the CCU through an Ethernet port, receives related signals sent by the CCU and controls the display of corresponding site information.

Guest room media television (LCD):

a passenger room LCD (liquid crystal display) adopts an 17/19/21-inch display screen, is arranged on the side wall of a passenger room carriage and is one of the most important terminal display devices of a passenger information display subsystem, and an LCD display interface is an important window for providing media entertainment information and train operation service information for passengers.

An LED display:

the LCE display comprises a terminal station display (EDD), an external information display screen (BID) and an internal information display screen (EID), is a PIS system LED display terminal, can automatically adjust and display contents according to different IP addresses, and comprises a train operation terminal station, a next station, broadcast words, emergency information and the like.

Network camera IPC:

the network camera comprises a rearview camera, a driving recording camera and a guest room camera; the color network camera with fixed focal length is used for monitoring the conditions of a driver cab and a passenger room, acquires image signals through a photosensitive module, generates a network video code stream through a video coding module and uploads the network video code stream to an Ethernet.

Cab/guest room network camera:

vehicle driving record camera:

the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A method for realizing networked train broadcasting is characterized by comprising the following steps;

OCC manual broadcasting step: the control center OCC can wirelessly access the PIS system through the train and the ground in the operation process to manually broadcast passengers;

and (3) manual broadcasting: a driver directly triggers an 'artificial broadcast' function through a control console or PTT keys of handheld microphones on the side walls on the two sides;

an emergency broadcasting step: when the train encounters an emergency, a fire disaster or a serious fault occurs, a driver operates the PISM, and the emergency broadcasting operation broadcasts a voice file which is recorded in advance by the PISC at the main control end and contains the contents of 'command persuasion' or 'apology pacification' to passengers;

a full-automatic station reporting step: in a full-automatic station reporting mode, the PISC in a master control state receives an ATO (automatic train operation) station reporting control instruction forwarded by the TCMS, and performs 'departure station reporting' or 'arrival station reporting' on passengers according to a preset station reporting logic, wherein the station reporting content is a digital voice file which is recorded in advance and stored in the PISC;

a driver presses a PTT side key of the MIC, a key signal is acquired by the analog power amplifier, each analog power amplifier device is controlled by a vehicle audio bus, and an audio processing channel is opened; each passenger room simulates a power amplifier to connect audio to a loudspeaker line of the passenger room at ordinary times, and a driver shouts the passenger room through a microphone to finish the function of artificial broadcasting; the audio channel is disconnected after the PTT side key of the MIC is released;

2. The networked train broadcasting implementation method of claim 1, wherein the OCC emergency broadcasting step further comprises the steps of;

the control center OCC is connected with the PISC through the Ethernet and sends an OCC emergency broadcast control instruction to the PISCs at the two ends; the method comprises the steps that a main control end PISC receives an operation instruction, and switches a broadcast mode to an OCC emergency broadcast state by judging broadcast priority and broadcast volume level; the PISC decodes the corresponding emergency broadcast voice file and sends the decoded emergency broadcast voice file to the CCU of the guest room through the Ethernet; and the CCU decodes the digital audio signal after receiving the digital audio signal, and the decoded audio signal is broadcasted after being processed by an analog channel.

3. The method of claim 1, wherein the OCC emergency broadcasting step further comprises the OCC and passenger emergency intercom step: under an unattended automatic driving mode, when an emergency or an emergency occurs in a passenger room, a passenger can press an alarm button of the emergency alarm in the passenger room according to the instruction on the emergency alarm and realize talkback communication with an OCC control center through an internal talkback device beside the button;

a passenger initiates a request for communicating with a driver by triggering a PEI alarm key of an emergency alarm;

the PAU sends an alarm instruction to the CCU through an Ethernet bus;

after receiving the alarm instruction, the CCU sends a call request instruction to the PISC (host computer system) on the master control side through the Ethernet bus after processing;

after receiving the call request instruction, the PISC at the master control side comprehensively judges all current alarm information, sorts the alarm information according to the time sequence, and then sends the alarm call request to the PISM through Ethernet communication; PISC sends the alarm call request to OCC control center

The PISM pops up an alarm picture on a display screen after receiving the alarm call request instruction;

the OCC carries out on-off or hang-up operation and sends an operation instruction to the main control end PISC;

the method comprises the following steps that after receiving an alarm connection or hang-up instruction, a PISC (host computer system) at a main control end processes the alarm connection or hang-up instruction and sends the alarm connection or hang-up instruction to a CCU (central processing unit) through an Ethernet bus;

after receiving an alarm connection instruction, a CCU of a carriage where the alarm which alarms firstly is located establishes an audio channel, and simultaneously sends an indicator lamp control instruction to the PEI, and full-duplex communication can be carried out between the PEI and the PISC of the main control end;

the CCU corresponding to the PEI in the queuing state sends a call busy instruction to the PEI, and a PEI busy indicator lamp is lightened;

and (4) hanging up through the 0CC or resetting the PEI to finish the current call, and the system switches on the next queuing alarm according to the flow until all the alarms triggering the alarm are hung up.

4. The networked train broadcasting implementation method of claim 1, wherein the semi-automatic station reporting step further comprises the steps of; the train signal system sends head/tail, door closing, zero speed, thirty kilometers or mileage and speed signals to the PISC at the master control side in real time; the PISC collects the signals to judge the current running state of the train, analyzes and generates a station reporting broadcast control instruction according to preset station reporting logic, and judges the broadcast priority and the broadcast volume level at the same time; PISC decodes the corresponding 'departure stop announcement' and 'arrival stop announcement' voice files, and sends the decoded voice files to the CCU of the guest room through the Ethernet; and the CCU decodes the digital audio signal after receiving the digital audio signal, and the decoded audio signal is broadcasted after being processed by an analog channel.

5. The method of claim 2, wherein the broadcast priority levels are ranked from high to low as follows:

(1) OCC artificial broadcast;

(2) OCC emergency broadcast;

(3) OCC manual station reporting;

(4) manual broadcasting;

(5) emergency broadcasting;

(6) manual station reporting;

(7) fully-automatic station reporting and broadcasting ATO;

1) the OCC talkbacks with passengers in an emergency;

2) the driver and the passenger talkback in an emergency;

3) the driver talkbacks with the driver;

the artificial broadcast and intercom system uses the same hand-held microphone, wherein the priority of artificial broadcast and driver intercom is set as:

1) manual broadcasting is preferred;

2) the driver has the priority of talkback;

3) and the same grade.

6. The method of claim 5, wherein the emergency intercom step between driver and passenger comprises: the method comprises the steps that under a driver value riding and driving mode, when an emergency situation or an emergency occurs in a passenger room, passengers press an alarm button of an emergency alarm in the passenger room according to instructions on the emergency alarm, and an intercom call with a driver is realized through an internal intercom device beside the button;

a passenger initiates a request for communicating with a driver by triggering a PEI alarm key of an emergency alarm; the PAU sends an alarm instruction to the CCU through an Ethernet bus; after receiving the alarm instruction, the CCU sends a call request instruction to the PISC (host computer system) on the master control side through the Ethernet bus after processing; after receiving the call request instruction, the MCU at the master control side comprehensively judges all current alarm information, sorts the alarm information according to the time sequence, and then sends the alarm call request to the PISM through Ethernet communication; the PISM pops up an alarm picture on a display screen after receiving the alarm call request instruction; the PISM is operated to switch on the alarm, and sends an alarm switching-on instruction to the PISC of the main control terminal; the method comprises the following steps that a main control end PISC receives an alarm connection instruction, processes the alarm connection instruction and sends the alarm connection instruction to a CCU (central processing unit) through an Ethernet bus; after receiving an alarm connection instruction, a CCU of a carriage where the alarm which alarms firstly is located establishes an audio channel, and simultaneously sends an indicator lamp control instruction to the PEI, and full-duplex communication can be carried out between the PEI and the PISC of the main control end; the CCU corresponding to the PEI in the queuing state sends a call busy instruction to the PEI, and a PEI busy indicator lamp is lightened; and (4) ending the current call by hanging up the PISM or resetting the PEI, and connecting the next queuing alarm by the system according to the flow until all alarms triggering the alarm are connected.

7. A networked vehicle-mounted broadcasting system is characterized in that a full Ethernet topology is adopted and matched with a digital multimedia terminal; the low-power consumption terminal equipment adopts POE power supply IEEE 802.3af/at technology; the switch adopts a dynamic host configuration protocol DHCP to automatically allocate the IP address of the terminal equipment; visual digital talkback is realized by adopting a VoIP technology; based on the gigabit Ethernet communication technology, an embedded processor is used as a core, a full Ethernet topology, a digital multimedia terminal and an integrated control host are adopted, three subsystems and the Ethernet are integrated, and POE power supply and DHCP technology is used for terminal equipment.

8. The networked vehicle-mounted broadcasting system according to claim 7, wherein all terminal devices are digitized and accessed to the Ethernet based on Ethernet building; the system host PISC adopts a three-layer switch, the CCU adopts a two-layer switch, and the terminal equipment is completely digitalized and connected to the Ethernet; the train-level Ethernet adopts a gigabit network and supports two networking modes of link aggregation or ring topology; all terminals in the digital PIS adopt Ethernet communication, and all the terminals preferentially adopt DHCP to carry out IP setting and power supply adopts network cables to supply power in consideration of wiring and debugging of the system; the passenger room LCD display and the passenger guidance display TGS are distributed on two sides of the carriage and are cascaded in a hand-in-hand mode, two Ethernet interfaces are required to be arranged on a single terminal device, and the two interfaces have Bypass functions.

9. The networked vehicle-mounted broadcasting system of claim 7, wherein the vehicle-mounted broadcasting system is functionally divided on the basis of terminal devices, and comprises functions of broadcasting station reporting, talkback communication, information display, video storage and monitoring query; when the system normally operates, the main control end PISC is mainly used for working, and the slave control end PISC is in a hot standby state and is used for data synchronization.

10. The networked vehicle-mounted broadcasting system of claim 7, wherein one PISC is respectively installed in a driver cab at the head and tail of the vehicle, and the default PISC works as a master control end, and the other PISC is hot standby as a slave control end;

under the normal condition, only one end of the driver cab PISC is in a master control state, the master control state is determined by that the local end PISC receives effective operation, the effective operation is only limited to two types, namely PISM touch operation and train head and tail signal key activation, wherein the key activation priority is greater than the PISM touch operation;

when the communication between the two ends is normal, the two ends of the PISC can be switched to the main control state by the operation of the two ends of the PISC, the main control state of the main control end PISC is sent to the other end of the PISC, and the other end of the PISC becomes a slave control end; when the communication between the two ends is interrupted, the PISC capable of normally communicating with the PISM can be switched to the main control end through the PISM, and the PISC incapable of normally communicating with the other end is not changed until the next effective operation is carried out, and the PISC is switched or activated through head and tail signals;

when the drivers 'cab PISCs at two ends receive the head and tail signal activation state, the drivers' cab PISCs at the end only receiving the head and tail signal activation state are taken as the master control end, and after the head and tail signals disappear, the master control state disappears, and the master control end automatically becomes the slave control end; when the two-end communication is normal, the master control end PISC sends the master control state to the other end PISC, and the other end PISC becomes a slave control end and cannot "rob" the master control state; when the communication between the two ends is interrupted, the activating end receiving the head and tail signals is the master control end, and the activating end not receiving the head and tail signals is the slave control end until the next effective operation, and the head and tail signals are switched or activated through PISM.