JP3713526B2 - Driver's cab monitor backup system - Google Patents

Description

【００６４】
前述したように、監視カメラＡ１，Ｂ２、画面合成器Ａ６、送光回路部Ａ１４、送光器Ａ１６は上線用の装置であり、監視カメラＣ３，Ｄ４、画面合成器Ｂ７、送光回路部Ａ１５、送光器Ｂ１７は下線用装置である。また、この表中、各モニタにおける［Ａ」、「Ｂ」、「Ｃ」、「Ｄ」はそれぞれ監視カメラＡ１〜Ｄ４で撮影した上線および下線の映像，［Ａ＋Ｂ」、［Ｃ＋Ｄ」はそれぞれ合成画像を示している。
【００６５】
表１から分かるように、故障のない場合には、運転台モニタでは上線の場合Ａ＋Ｂの合成画面を監視し、下線ではＣ＋Ｄの合成画面を監視する。また、駅務室モニタおよび指令所モニタでは合成前後の任意の映像を監視することができる。
【００６６】
表１の故障箇所番号１〜４の監視カメラの故障の場合、次のような処置がとられる。すなわち、監視カメラＡまたはＢが故障した場合、上線の運転台モニタでの映像監視ができなくなるため、駅務室および指令所に対してその旨の警報が発せられ、故障したカメラの映像に関してバックアップのために必要であれば、指令員は、駅務員にホームで対応するよう指示を行い、駅務員は、この指示に応じてまたは自発的にホームへ行き、当該故障カメラのバックアップのために目視による監視を行う。駅務室モニタおよび指令所モニタでは、故障した監視カメラの以外の映像を監視可能である。例えば、監視カメラＡが故障した場合、監視カメラＢの画像が駅務所および指令所の監視モニタに表示されるよう映像切替が行われる。カメラＣまたはＤの故障の場合は下線の運転台モニタでの監視が行えなくなる以外、故障箇所番号１、２の場合と同様である。
【００６７】
故障箇所番号５および１２の、映像分配器の故障の場合は４台の監視カメラのすべてについてその映像が利用できなくなった場合であり、運転台モニタ、駅務室モニタおよび指令所モニタのいずれにおいても監視が不能となる。そこで、駅務員がホームで監視を行うよう、駅務室および指令所において警報が発せられる。
【００６８】
故障箇所番号６〜１１の、画面合成器および変調器の故障の場合は、それらの出力が冗長になっている（各映像について、単独映像と合成映像とがある）ので、駅務室モニタおよび指令所モニタでは、故障していない系統の映像をバックアップ監視する。また、駅務室および指令所ではバックアップ監視が必要である旨の警報が発せられる。
【００６９】
故障箇所番号１３〜１８の送受光関係装置の故障、および故障箇所番号１９の運転台モニタの故障の場合、当該故障系統の合成映像について運転台モニタでの監視は不能となるが、駅務室および中央指令所ではすべての映像が利用可能なので、駅務室モニタおよび指令所モニタで、所定の映像（合成または単独の映像）をバックアップ監視を行うよう表示が切り替えられる。また、それに関連した警報が発せられる。
【００７０】
次に具体的に、図６〜図１２により、通常時の動作および故障時のバックアップ動作を説明する。
【００７１】
図６は、図２のシステム構成のうち、通常時の地上の駅ホームで撮影した列車側面の映像を当該列車の運転台に伝送し運転台の乗務員がその映像を監視する際に使用される設備を示したものである。この例は、車両が上線ホームに入線したとき機能する構成部分を実線で示している。すなわち、監視カメラ１、２により上線ホームの撮影を行い、その２画面を画面合成器６により合成して送光回路部１４、送光器１６経由で車上の運転台監視モニタに映像伝送を行うことを表している。破線で示した部分は、下線側に対応している。
【００７２】
図７は、図２のシステム構成のうち、地上における関連機器である監視カメラＡ１，Ｂ２、映像分配器Ａ５、画面合成器Ａ６（これらを図では×印で示してある）の故障状態を監視し、映像同期信号が検知されない故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させるための設備を実線で示し、それ以外の設備を破線で示したものである。具体例として、監視カメラＡ１が故障した場合、残された同じ上線ホームの監視カメラＢ２の映像が画面合成されることなく変調器Ｂ９経由で駅務室、中央指令所の映像切替器２５，２８に伝送されており、この映像を選択するよう切り替えられる。画面合成器Ａ６が故障した場合、画面合成を行わない監視カメラＡ，Ｂの映像が、変調器Ｂ９経由で駅務室、中央指令所の監視モニタに伝送され、２台の監視モニタにより監視される。
【００７３】
図８は、図２の内、地上における関連機器である変調器Ａ８，Ｂ９、映像分配器Ｂ１２、送光回路部Ａ１４，Ｂ１５、送光器Ａ１６，Ｂ１７、受光器Ｂ３５，Ｃ３６、受光回路部Ｂ３７，Ｃ３８の故障状態を監視し、映像キャリア信号が検知されない故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させるための設備を強調して示している。
【００７４】
なお、変調器、映像分配器の映像キャリア信号が検知されない場合と、地上側の送光回路部、送光器の映像キャリア信号が検知されない場合、あるいは地上側の受光器、受光回路部の映像キャリア信号が検知されない場合とでは、搬送周波数が異なることから、故障した機器の特定が可能であり、変調器、映像分配器の故障した場合を除いて、駅務室および中央指令所でのバックアップ監視が可能となる。
【００７５】
図９は、図７と類似するが、図２のシステム構成のうち、地上における関連機器である監視カメラ、映像分配器５、画面合成器６の故障状態を監視し、映像同期信号が検知されない故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させた旨の警報出力を行うために使用される設備を強調して示したものである。
【００７６】
図１０は、図８と類似するが、図２の内、地上における関連機器である変調器Ａ８，Ｂ９、映像分配器Ｂ１２、送光回路部Ａ１４，Ｂ１５、送光器Ａ１６，Ｂ１７、受光器Ｂ３５，Ｃ３６、受光回路部Ｂ３７，Ｃ３８の故障状態を監視し、映像キャリア信号が検知されない故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させた旨の警報出力を行うために使用される設備を強調して示したものである。
【００７７】
図１１は、図２の内、車上における関連機器である受光器Ａ１９、受光回路部Ａ２０、送光回路部Ｃ３３、送光器Ｃ３４の故障状態を監視し、故障が検知出力された場合に、当該列車の監視映像を、関係する駅務室、中央指令所に切り替えて表示させるための設備を強調して示したものである。送光回路部または送光器のみが故障した場合は、運転台監視モニタでは監視が行えるが、念のため、駅務室および中央指令所でもバックアップ監視を行うこととする。
【００７８】
図１２は、図１１と類似するが、図２の内、車上における関連機器である受光器Ａ１９、受光回路部Ａ２０、送光回路部Ｃ３３、送光器Ｃ３４の故障状態を監視し、故障が検知出力された場合に、当該列車の監視映像を、関係する駅務室、中央指令所に切り替えて表示させた旨の警報出力を行うために使用される設備を強調して示したものである。この場合も、送光回路部または送光器のみが故障した場合は、運転台監視モニタでは監視が行えるが、念のため、駅務室および中央指令所でも警報出力を行うこととする。
【００７９】
本実施の形態では、対列車映像伝送を、近赤外線による光空間伝送を用いて説明したが、映像を伝送するという観点からみればミリ波、ＬＣＸ、スペクトラム拡散などの方式においても同様である。
【００８０】
また、故障状態の検出結果を上記のように出力するだけでなく、機器の故障状態を監視する設備管理設備（図示せず）などの装置に対しても故障状態の検出結果を出力するようにしてもよい。
【００８１】
【発明の効果】
本発明により、鉄道における列車の側面監視を運転士が行う場合、関連機器が故障し、運転台による監視ができなくなった状況のバックアップにおいて次の効果が期待できる。
【００８２】
（１）地上装置の映像キャリア信号が「断」および／または映像キャリア信号復調後の同期信号「無」となったことによりバックアップ監視ができなくなった場合、駅務員が対応できるよう地上装置の故障を駅務室に警報出力する。これにより、従来は運転台での表示ができなくなったことを運転士から列車無線により指令員に連絡し、指令員が該当駅務員に連絡をしてホームでの監視依頼をしてから対応していたのに比べ、迅速な対応が可能となる。
【００８３】
（２）車上装置の映像キャリア信号「断」および／または映像キャリア信号復調後の同期信号「無」となり故障を認知した場合、運転台において映像のモニタができなくなる。この時、従来は運転台での表示ができなくなったことを運転士から列車無線により指令員に連絡し、指令員が該当列車の追跡を行うことによりバックアップ監視を行っていたことに比べ、運転士からの連絡が入る前に迅速な対応が可能となる。
【００８４】
（３）地上設備の故障を検知しているため、保守を行う部署への連絡を早急に対応することが可能となる。
【００８５】
（４）車上設備の故障を検知しているため、保守を行う部署への連絡を早急に対応することが可能となる。
【図面の簡単な説明】
【図１】 ホームの前後に設置した地上側のカメラで撮影した映像を画面合成し、対列車光映像伝送により車上に伝送して運転台の監視モニタに表示させる、本発明によるシステムの外観による概略構成を示す説明図である。
【図２】 図１のシステムの機能面から見た構成を示すブロック図である。
【図３】 図２の構成に用いられている映像信号判定器の構成図を表す。
【図４】 図３の映像信号判定器における、映像キャリア信号の欠落を検出する考え方を示す。
【図５】 図３の映像信号判定器における、映像キャリア信号「断」、および／または映像キャリア信号復調後の同期信号「無」による故障状態の故障判定フローチャートを表す。
【図６】 図２の内、通常時の地上の駅ホームで撮影した列車側面の映像を当該列車の運転台に伝送し、運転台の乗務員がその映像を監視するための設備の説明図である。
【図７】 図２の内、地上における関連機器の故障状態（映像同期信号未検出）を監視し、故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させるための設備の説明図である。
【図８】 図２の内、地上における関連機器の故障状態（映像キャリア信号未検出）を監視し、故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させるための設備の説明図である。
【図９】 図２の内、地上における関連機器の故障状態（映像同期信号未検出）を監視し、故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させる旨の警報出力を行うための設備の説明図である。
【図１０】 図２の内、地上における関連機器の故障状態（映像キャリア信号未検出）を監視し、故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させる旨の警報出力を行うための設備の説明図である。
【図１１】 図２の内、車上における関連機器の故障状態を監視し、故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させるための設備の説明図である。
【図１２】 図２の内、車上における関連機器の故障状態を監視し、故障が検知出力された場合に、当該列車の監視映像を関係する駅務室、中央指令所に切替えて表示させる旨の警報出力を行うための設備の説明図である。
【符号の説明】
１〜４…監視カメラＡ，Ｂ，Ｃ，Ｄ
５…映像分配器Ａ
６〜７…画面合成器Ａ，Ｂ
８〜１１…変調器Ａ，Ｂ，Ｃ，Ｄ
１２…映像分配器Ｂ
１３…映像信号判定器Ａ
１４〜１５…送光回路部Ａ，Ｂ
１６〜１７…送光器Ａ，Ｂ
１８…車両
１９…受光器Ａ
２０…受光回路部Ａ
２１…映像信号判定器Ｂ
２２…運転台監視モニタ受像機
２３…アナログ多重光送信機
２４…アナログ多重光受信機
２５…駅務室映像切替器
２６〜２７…駅務室監視モニタ受像器Ａ，Ｂ
２８…指令所映像切替器
２９〜３２…指令所監視モニタ受像機Ａ，Ｂ，Ｃ，Ｄ
３３…送光回路部Ｃ
３４…送光器Ｃ
３５…受光器Ｂ
３６…受光器Ｃ
３７…受光回路部Ｂ
３８…受光回路部Ｃ
３９…故障情報収集器
４０…駅務室映像切替制御装置
４１…駅務室映像切替警報出力装置
４２…指令所映像切替制御装置
４３…指令所映像切替警報出力装置
１０１…入力端子部
１０２…出力端子部
１０３…映像分配部
１０４…映像キャリア信号検知部
１０５…映像信号復調部
１０６…映像同期信号検知部
１０７，１０８…故障情報出力端子部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a system for ensuring safety of a train on a station platform and its surroundings, and more particularly, to a cab monitor backup system when monitoring at the cab becomes impossible.
[0002]
[Prior art]
In the railway industry, it is necessary to perform vehicle side monitoring when entering the train to ensure safety. Also, the door part needs to be monitored when the door closing operation is performed at the time of departure. In particular, when performing a one-man operation, the driver must monitor the vehicle side to ensure safety at the cab.
[0003]
In the vehicle side monitoring at the driver's cab, the conventional technology detects the failure state due to the power-off of related equipment installed on the ground, and monitors the vehicle side video of the corresponding station at the relevant station and / or the central command station. You are doing a backup with.
[0004]
In addition, when the driver's cab monitor disappears, the driver transmits the fact to the commander at the central command station by train radio and tracks the train with the signal equipment while the train arrives at the station side of the station. The video is monitored at the station and / or the central command station.
[0005]
In other words, when monitoring images on the driver's cab, the ground system is divided into the ground system from the surveillance camera that captures the video to the transmitter, and the on-vehicle system from the receiver installed on the driver's cab to the monitor. The backup by detecting the failure state of the equipment is triggered by the video carrier signal “disconnection” and / or the synchronization signal “no” after demodulating the video carrier signal, and the on-board backup triggers the train radio communication from the driver. It corresponds as.
[0006]
Further, in video transmission between each station and the central command station for video monitoring at the central command station, it is common to use a baseband system.
[0007]
[Problems to be solved by the invention]
In the conventional technology as described above, the power failure of the surveillance camera, the video distributor, and the screen synthesizer is determined as a failure detection. That is, since the failure is not recognized unless the power is “off”, the case where no video is output with the power “on” is not recognized as a failure. Therefore, it was not possible to take a complete backup posture.
[0008]
In addition, the failure of the on-board device can be dealt with by reporting to the commander on the ground side by train radio that the driver can no longer monitor at the cab, but the reason why the on-board device cannot be monitored It is not known whether it is a malfunction of the ground device or a ground device. Therefore, when the on-board equipment is out of order, the failure cannot be identified until the next station is entered.
[0009]
On the other hand, as described above, in the video transmission between each station and the central command station, the baseband method is mainstream, and the video, the control signal, and the failure signal have to be transmitted by separate cables. That is, in this method, the video, the control signal, and the failure signal cannot be transmitted using the same cable, and a plurality of videos must be transmitted using different cables. In other words, when transmitting a plurality of videos, it is necessary to lay the cables for that amount, the cables for the control signal, and the failure signal. Also, when extending the route, it was necessary to again lay the cable from the extension part to the central command station, and the expandability of adding a monitoring place was poor.
[0010]
The present invention has been made in view of such a conventional problem, in a facility for transmitting a video of a train side surface photographed on the ground to a cab of the train, and a crew member of the cab monitoring the video. , Automatically monitor the failure status of related equipment on the ground side and / or the upper side of the vehicle, and if a failure is detected and output, the station office, It is an object of the present invention to provide a cab monitor backup system that can be displayed on a command station monitor and monitored by station staff and commanders.
[0011]
[Means for Solving the Problems]
The cab monitor backup system according to the present invention is a monitoring means for capturing a video of a side portion of a train that has entered a station, transmitting the video to the cab of the train, and monitoring the cab monitor. In order to detect the failure state of the related equipment of the means, the detection means for detecting the video carrier signal “disconnection” of the monitoring video and / or the synchronization signal “no” after the video carrier signal demodulation, and the detection output from the detection means When it occurs, the monitoring video of the train is displayed on a backup monitor provided in at least one of the related station office or central command station by a predetermined method. The predetermined method will be described later in detail.
[0012]
In this cab monitor backup system, among the related equipment of the monitoring means, in the ground facility that captures and transmits the video of the train side, the video carrier having a plurality of different video carrier frequencies for transmission of the video of the train side It is desirable that the detection means uses a signal to detect a failure state based on the video carrier signal “disconnected” and / or the synchronization signal “none” after demodulating the video carrier signal for each video carrier frequency.
[0013]
The detection means detects, for example, a video carrier signal “disconnection” and / or a synchronization signal “none” after demodulation of the video carrier signal in an on-vehicle facility among the related devices of the monitoring means, and transmits light on the vehicle. The failure state is output by an optical signal to the ground equipment from the device by detecting the video carrier signal “OFF” and / or the synchronization signal “NO” after demodulating the video carrier signal.
[0014]
The detected fault condition output is multiplexed with video carrier signals on the side of the train taken at various locations, preferably by analog multiplex transmission (broadband transmission), and sent to the station office and / or central command office.
[0015]
Preferably, all the images taken by a plurality of surveillance cameras and the images after processing these images are transmitted to the station office and / or the central command station, and the station office and / or the central command station side Then, select the screen to be monitored and display it.
[0016]
At this time, the selection of the screen to be monitored is automatically performed according to the output of the failure state, or when the failure state is not detected, the selection of the screen to be monitored is based on the screen selection input by the user. Do.
[0017]
It is desirable to have alarm output means for outputting an alarm to the effect that selection of the screen has been automatically performed at the station office and / or the central command station when the failure state is detected. Alternatively, it is desirable that the station service room and / or the central command station have alarm output means for outputting an alarm to the effect that the station staff should perform visual monitoring at home.
[0018]
As one form of the processing, preferably, a synthesizer for synthesizing a plurality of videos for the driver's cab monitor is provided, and the synthesized video and the video before synthesis are simultaneously sent to the station office and / or the central command station. To transmit.
[0019]
When it is detected that this synthesizer has failed, control is performed to display the pre-combination video in the station office and / or central command center, and it is detected that the modulator that modulates the transmitted video has failed. It is preferable to have a control means for performing control to display the composite video that should have been transmitted to the cab monitor and / or the video before the composite video in the station office and / or the central command station.
[0020]
A conceptual diagram of such a system is shown in FIG.
[0021]
When performing vehicle-side monitoring in a driver's cab assuming one-man operation, monitoring at the driver's cab becomes impossible due to failure of related equipment, which may hinder the driver's vehicle-side monitoring work. Therefore, in order to ensure more secure safety, it is necessary to back up at a place where there are people involved in railway operations, such as station staff and commanders, assuming failure of related equipment. With this backup method, even if it becomes impossible for the driver to monitor the cab on the driver's cab, the station staff and the commander can respond, and more secure safety can be achieved. .
[0022]
In a system that transmits the situation of the home using the optical video transmission to the train in the cab that carries out a one-man operation, and is monitored by the driver, the ground equipment side (monitoring camera, video distributor, screen synthesizer, light transmission circuit section Assuming the case where it becomes impossible to monitor by detecting a failure based on the detection of the video carrier signal “OFF” as the output of the optical transmitter and / or the synchronization signal “NO” after demodulating the video carrier signal, The monitor at the cab is backed up by displaying images to be monitored at the office and the central command center. By adopting this failure detection method, a case where no video is output even when the power is turned on can be recognized as a failure, so that more detailed backup can be performed.
[0023]
In addition, when the video carrier signal on the on-vehicle device side (receiver, light receiving circuit unit) installed on the vehicle falls below the specified value, that is, the video carrier signal is “disconnected” and / or synchronized after the video carrier signal is demodulated. The configuration is such that backup is performed without requesting the driver's judgment by determining that the signal is “none” as a failure.
[0024]
Therefore, with the introduction of this backup method, the train station staff at the station and / or the commander at the central command center will receive a backup vehicle after receiving notification from the train driver that monitoring cannot be performed by the driver's monitor. Rather than start monitoring the side video, when the on-board device that should be monitored for failure detects the failure state for each video carrier frequency, the vehicle side video to be monitored on the vehicle corresponding to the video carrier frequency is It is possible to switch to the monitor of the office and the central command station and display it for backup monitoring.
[0025]
Furthermore, since the failure of the on-board equipment is detected, it is possible to promptly contact the department that maintains the vehicle.
[0026]
Furthermore, by adopting a broadband system for video transmission between each station and the central command station, it becomes possible to frequency-multiplex not only video and control signals, but also related equipment failure signals, and cables between each station and the central command station. It can be shared and reduced.
[0027]
In addition, because there are multiple images to be monitored per station in the backup at the central command station for train side monitoring in one-man operation, the broadband method is advantageous in that it is not necessary to lay cables for the number of screens. is there. Furthermore, when extending the route, it is necessary to install only the extension part without laying one cable for each station from each station of the extension part to the central command station. It is possible to easily add a monitoring screen by multiplexing.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a schematic external view of a system in which the present invention is applied to a platform of a train that performs a one-man operation, and the status of the home is transmitted using optical video transmission with respect to the train and is monitored by the driver.
[0029]
On the ground side, a plurality of surveillance cameras and a video processing device for processing video from them are arranged at predetermined positions on the home, and further, a light transmission circuit unit for receiving a signal from the video processing device and a transmission controlled thereby. An optical device is arranged at a position facing the driver's seat. FIG. 1 shows a case of a subway, and a light transmission circuit unit and a light transmitter are usually installed in a subway channel. However, the present invention is not limited to use in a subway. As shown in the upper right part of FIG. 1, a plurality of home images are displayed together on the on-vehicle monitor (receiver) screen.
[0030]
On the vehicle upper side, a light receiver that receives light from the light transmitter, a light receiving circuit unit that processes the light reception signal, and a vehicle monitor that displays a signal from the light receiving circuit unit are disposed on the cab.
[0031]
Based on detection of video carrier signal “disconnection” and / or synchronization signal “no” after demodulation of video carrier signal as output from ground device side (monitoring camera, image processing device, light transmission circuit unit, light transmitter) Assuming that it becomes impossible to monitor at the cab by detecting a failure, a video to be monitored is displayed in the station office or the central command station, and the monitoring at the cab is backed up. Depending on the difference in the output signal of each device, the “cut off” of the video carrier signal causes the modulators 8 to 11, the video distributor 12, the light transmission circuit units 14 and 15, the light transmitters 16 and 17, the light receiver 35, 36, the failure of the light receiving circuit units 37 and 38 is detected, and the failure of the monitoring cameras 1 to 4, the video distributor 5, and the screen combiners 6 and 7 is detected based on the synchronization signal “none” after the demodulation of the video carrier signal.
[0032]
FIG. 2 shows an image of the train side view taken at the station platform on the ground as shown in FIG. 1 and is transmitted to the cab of the train. This shows the system configuration in which the failure status of related equipment is monitored, and when a failure is detected and output, the monitoring video of the train is displayed in the relevant station office or central command station in a predetermined manner. Here, the case where the upper and lower line 2 homes are photographed by two surveillance cameras per home is shown.
[0033]
In the example of FIG. 1 and FIG. 2, the monitoring cameras 1 to 4 installed in the station platform shoot images for performing safety monitoring in the train operation, such as the side and door portions of the train operating on the upper and lower lines. When the train is long, it is difficult to see the screen and monitoring becomes difficult, so one train is photographed by a plurality of surveillance cameras. However, the cab monitoring monitor (on-board monitor) 22 can be installed only for one screen because of the installation location. Therefore, screen composition is performed in order to display the images of the plurality of monitoring cameras 1 to 4 on one screen. The image of the composite screen is as shown in FIG.
[0034]
The monitoring cameras 1 to 4 are input to the video distributor 5, where the output of each monitoring camera is distributed to a predetermined output destination. In this example, the outputs of the monitoring cameras 1 and 2 are input to the screen synthesizer 6 and the modulator 9 by the action of the video distributor 5, and the outputs of the monitoring cameras 3 and 4 are input to the screen synthesizer 7 and the modulator 11. Is input. This is because it is necessary to handle a screen composition of videos taken by a plurality of surveillance cameras 1 to 4 and a video as it is.
[0035]
The screen composition is performed by the screen synthesizers 6 and 7. That is, here, the screen synthesizer A6 synthesizes the images taken by the two monitoring cameras, the monitoring camera A1 that captures the front of the train that is stopped at the upper platform, and the monitoring camera B2 that captures the rear. B7 synthesizes the images of the monitoring cameras C3 and D4 that monitor the front and rear of the underline platform, respectively. The synthesized images of the surveillance cameras 1 to 4 are transmitted to the cab of the train traveling on the upper / underline as described below.
[0036]
Modulators A, B, C, and D (8 to 11) modulate each video signal with a different carrier frequency (for example, FM modulation) for broadband transmission. The video distributor B12 sends A of the surveillance cameras A1 and B2 synthesized by the screen synthesizer A6 to the cab of the train traveling on the upper line, and downloads the videos of the surveillance cameras C3 and D4 synthesized by the image synthesizer B7. And images taken by a plurality of surveillance cameras A1, B2, C3, and D4 and / or a plurality of surveillance cameras 1 to 4 synthesized by screen synthesizers A6 and B7. Is switched to station station monitoring A26, B27 and / or command station monitoring monitors A29, B30, C31, D32.
[0037]
The video signal determiner A13 determines the level of the video carrier signal of each video on the upper and lower lines, and outputs failure information as a video “OFF” when the video signal falls below a prescribed value. Similarly, it detects the loss of the video synchronization signal after demodulation and outputs failure information.
[0038]
The light transmission circuit units A14 and B15 amplify the video modulated by the modulators A8, B9, C10, and D11 to a signal level necessary for driving the light emitting diodes of the light transmitters A16 and B17. The light transmitters A16 and B17 send the images modulated by the modulators A8, B9, C10, and D11 to the space for the driver's cab via an optical lens and transmit them. The light transmission circuit unit 14 and the light transmitter 16 correspond to the uplink, and the light transmission circuit unit 15 and the light transmitter 17 correspond to the downlink.
[0039]
The light receiver A19 disposed in the vehicle 18 receives the optical signal transmitted by the light transmitters A16 and B17 with a light receiving element such as a PIN diode through the optical lens. The light receiving circuit unit A20 demodulates the image received by the light receiver A19 and transmits it to the monitoring monitor 22 of the cab. The video signal determiner B21 determines the video signal level, and outputs failure information as a video “OFF” when the video signal level falls below a prescribed value. Similarly, it detects the loss of the video synchronization signal after demodulation and outputs failure information. The cab monitoring monitor 22 displays the video received and demodulated in this way. The light transmission circuit unit C33 amplifies the failure information detected by the video signal determination unit B21 to a signal level for driving the light emitting diode of the light transmission unit C34. The light transmitter C34 converts the signal from the light transmitter C34 into an optical signal and sends it to the space via the optical lens for transmission to the ground-side light receivers B35 and C36.
[0040]
The light receivers B35 and C36 receive the optical signal transmitted from the light transmitter C34 with an optical element such as a PIN diode via an optical lens. The light receiving circuit parts B37 and C38 demodulate the failure information received by the light transmitter B35 and transmit it to the failure information collector 39.
[0041]
The failure information collector 39 receives, as failure information, the occurrence of the video carrier signal “OFF” or the synchronization signal “NO” after demodulating the video carrier signal in the terrestrial video signal determiner A13 or the vehicle upper video signal determiner B21. The failure information for video switching is transmitted to the station room video switching control device 40 and the command station video switching control device 42 by distinguishing between the ground side failure and the vehicle upper side failure.
[0042]
The analog multiplexed optical transmitter 23 uses an analog transmission path as a transmission medium for the video carrier signal, analog-multiplexes the home video at each station, and transmits the analog video to the central command station 100. Also, failure information for switching images from the failure information collector 39 is multiplexed together.
[0043]
The analog multiplexed optical receiver 24 at the central command station 100 receives the signal transmitted from the analog multiplexed transmitter 23. Also, failure information for video switching is received and branched.
[0044]
The command station video switcher 28 outputs images of train side sections that have entered and stopped at the upper / underline platforms of all stations to the command station monitoring monitors A29, B30, C31, and D32 installed at the central command station. Switch for Here, four monitor monitors 29 to 32 display and monitor images of all stations on the route as needed. The command center image switching control device 42 receives the failure information collected by the failure information collector 39 and forcibly performs the image switching control so as to select the image relating to the station that needs to be backed up due to the failure. In addition, it has an operation panel unit (not shown) that can be manually switched by the commander. The command station video switching alarm output device 43 displays that the failure information has been detected and / or outputs an alarm as a warning. Even when a failure occurs, the video can be switched manually based on an alarm.
[0045]
The video switcher 25 in the station service room 110 is a switch to output the video of the train side section that has entered and stopped at the station above / underline to the monitoring monitors A26 and B27 installed in the station service room. I do. The idea is to output the video of the upper line home to the monitor A26 and the image of the underline home to the monitor B27. The station service room monitoring monitor receivers A26 and B27 display the image selected by the station service room image switching unit 25. The station office room video switching control device 40 receives the failure information transmitted from the failure information collector 39 and forcibly performs switching control of the video for backup. It also has an operation panel (not shown) that allows station staff to manually switch video. The station room video switching alarm output device 41 displays that the failure information has been detected and / or outputs an alarm as a warning. Also in this case, it is possible to manually switch the video based on an alarm even when a failure occurs.
[0046]
In the example of FIG. 2, four monitoring cameras, two station office monitoring monitors, and four command station monitoring monitors are described. However, the number of units may be increased or decreased depending on the monitoring contents.
[0047]
FIG. 3 shows a configuration example of the video signal determiners 13 and 21. Since both have the same configuration, the high-frequency video signal input from the input terminal unit 101 is distributed to the output terminal unit 102 and the video carrier signal detection unit 104 by the distribution unit 103 in the video signal determination unit 13 here. . Here, the distribution unit 103 may change the distribution number depending on the number of output terminal units 102. As shown in FIG. 4, the video carrier signal detection unit 104 detects the presence / absence of a video carrier signal for each video carrier frequency (channel), and if it is missing (in the case of “OFF”), a fault information signal is output as a fault information output terminal. 107, that is, output to the failure information collector 39. The output of the video carrier signal detector 104 is input to the video synchronization signal detector 106 via the demodulator 105 that demodulates the frequency video signal video signal modulated by the modulators A8, B9, C10, and D11. The The video synchronization signal detector 106 detects the presence / absence of a synchronization signal, and if it is “None”, outputs it to the failure information output terminal. The failure information output terminal 108 is connected to the failure information collector 39.
[0048]
In addition, although the example which multiplexes only to transmission to a central command office was shown, you may multiplex also in transmission to a station affairs room.
[0049]
In such a system configuration, in the cab of the vehicle 18, the cab monitoring monitor 22 monitors the image of the train side portion that has entered and stopped at the upper / underline platform. In the example of FIG. 2, a plurality of monitoring cameras synthesized by the screen synthesizers 6 to 7 and / or images of train side sections that have entered and stopped at the upper / underline homes taken by the monitoring cameras 1 to 4. In the station office room 110, the upper and lower lines of the own station are monitored at any time by the two monitoring monitors 26 to 27, respectively, and at the central command station 100, the four monitoring monitors 29 to 32 are used to monitor all the images. Monitor video selectively at any time.
[0050]
When it is detected as failure information for each video carrier frequency that the video carrier signal “disconnected” from the video signal determination unit 13 or 21 and / or the synchronization signal “none” after the video carrier signal demodulation is generated, The station staff in the station office and the commander in the central command center perform backup monitoring. Further, it is displayed that failure information has been detected and / or outputted by voice. In backup monitoring, failure information of related devices is converted into images taken by the failure information collector 39 by the monitoring cameras 1 to 4 and / or videos of the plurality of monitoring cameras 1 to 4 synthesized by the screen synthesizers 6 to 7. In response to being collected for each corresponding video carrier frequency, video of a system composed of devices that are not malfunctioning is output to the station office monitor 26-27 and the command station monitor 29-32. Perform video switching control.
[0051]
At that time, as a basic idea, if a failure due to the video carrier signal “disconnection” of the ground signal and the synchronization signal “no” after demodulation of the video carrier signal is detected corresponding to the video carrier frequency, the station, Since the video of the fault system of the home cannot be monitored by the monitoring monitor of the cab, backup of the video that should be monitored by the monitoring monitor of the cab after outputting the fault alarm of the related equipment at the station office or the central command station Monitor. On the other hand, if a failure due to the video carrier signal corresponding to the video carrier frequency is detected in response to the video carrier frequency corresponding to the video carrier signal “OFF” and / or the synchronization signal “NO” after the video carrier signal demodulation, Since the video of the station and the platform cannot be monitored with the monitoring monitor of the driver's cab, a backup alarm of the video that should be monitored with the monitoring monitor of the driver's cab after outputting a fault warning of the related equipment at the station office or the central command station I do.
[0052]
Specifically, it is divided into the following cases.
[0053]
First, terrestrial equipment, that is, some modulators, light transmission circuit units, video carrier signal “off” of the light transmitter, and / or synchronization signal “no” after video carrier signal demodulation of some surveillance cameras, screen synthesizer In this case, the video of the system including the failed device cannot be monitored on the cab at the station, and the video of the system not including the failed device can be monitored at the station office or the central command office. It can be carried out.
[0054]
In addition, if the on-vehicle device, that is, the receiver, the video carrier signal “OFF” of the light receiving circuit unit and / or the synchronization signal “NO” after demodulating the video carrier signal, only the vehicle on which the malfunctioning device is mounted Side monitoring video can no longer be monitored, but backup monitoring can be performed at the station office or central command station. At that time, since the equipment on the ground side has not failed, the post-screen composition video that should have been sent to the driver's cab and the pre-screen composition video are selected and monitored at the station office and the central command center. be able to. In this case, if it is a video after screen composition, it will be monitored by one monitor monitor as in the monitor monitor on the car, and if it is a video before screen composition, two monitor monitors will be used. That is, the required number of monitoring monitors varies depending on the monitoring method (operation) of backup monitoring.
[0055]
A backup monitor is displayed as soon as each device breaks down, but the operator can communicate to the commander at the central command center that a failure has occurred via train radio, which is a separate system from the current equipment. .
[0056]
FIG. 5 shows a failure determination flowchart of the video carrier signal “disconnected” and / or the synchronization signal “none” after video carrier signal demodulation in the video signal determiners 13 and 21.
[0057]
Upon receiving the high-frequency video signal input (51), it is checked whether the video carrier signal is normally detected for each channel frequency (52). The “video” here means the video of the monitoring cameras 1 to 4 and the screen synthesizers 6 and 7 in the video signal determination unit 13, and the video sent to the vehicle in the video signal determination unit 21. . If the video signal input is normal, each video signal is demodulated (53). Therefore, it is checked whether or not each video synchronization signal is detected (54). If the video synchronization signal is detected normally, control output for video switching is performed (55). That is, during normal times, switching control of the video signal is performed according to a predetermined control pattern.
[0058]
If no video synchronization signal is detected in step 54, the video is identified from the frequency (57), failure information (B) is output for the video (58), and the process proceeds to the next step 61.
[0059]
If it is determined in the previous step 52 that the video carrier signal is “disconnected”, the video is identified based on the frequency (59), and failure information (A) is output for the video (60).
[0060]
In step 61, the failure information collector 39 determines the failure type (A / B) and the failed device based on the failure information (A) or (B). Next, a control signal is output according to the determination contents (62), and the process proceeds to step 55.
[0061]
In step 55, when the control signal from step 62 is received, a control output for performing video switching control according to a control pattern corresponding to the failure state is performed. This control output controls the video switching control device 40 via the failure information collector 39, or further controls the video switching control device 42 via the analog multiple transmitter 23 and the analog multiple receiver 24.
[0062]
Table 1 shows the contents of processing for each failure location at the time of failure of each device and the correspondence contents of station staff and commanders.
[0063]
[Table 1]

[0064]
As described above, the monitoring cameras A1 and B2, the screen synthesizer A6, the light transmission circuit unit A14, and the light transmission unit A16 are devices for overline, and the monitoring cameras C3 and D4, the screen composition unit B7, and the light transmission circuit unit A15. The light transmitter B17 is an underline device. Also, in this table, [A], “B”, “C”, and “D” in each monitor are the overline and underline images taken by the monitoring cameras A1 to D4, respectively, and [A + B] and [C + D] are respectively synthesized. An image is shown.
[0065]
As can be seen from Table 1, when there is no failure, the cab monitor monitors the combined screen of A + B for the upper line, and monitors the combined screen of C + D for the underline. The station office monitor and the command station monitor can monitor arbitrary images before and after the composition.
[0066]
In the case of the failure of the surveillance camera of failure location numbers 1 to 4 in Table 1, the following measures are taken. In other words, if surveillance camera A or B breaks down, video monitoring on the cab monitor on the upper line becomes impossible, so a warning to that effect is issued to the station office and the command station, and backup of the video of the failed camera If necessary, the commander instructs the station staff to respond at home, and the station staff goes to the home in response to this instruction or voluntarily to back up the camera in question. Monitor visually. In the station office monitor and the command station monitor, it is possible to monitor images other than the malfunctioning surveillance camera. For example, when the monitoring camera A fails, the video is switched so that the image of the monitoring camera B is displayed on the monitoring monitors at the station office and the command station. In the case of a failure of camera C or D, it is the same as in the case of failure location numbers 1 and 2 except that monitoring with the underlined cab monitor cannot be performed.
[0067]
In the case of a video distributor failure at failure location numbers 5 and 12, the video is not available for all four surveillance cameras, and any of the cab monitor, station office monitor and command station monitor However, monitoring becomes impossible. Therefore, an alarm is issued in the station office and the command office so that the station staff can monitor at home.
[0068]
In the case of failure of the screen synthesizer and the modulator of the failure location numbers 6 to 11, their outputs are redundant (each video has a single video and a composite video). The command center monitor performs backup monitoring of the video of the system that has not failed. In addition, a warning that backup monitoring is necessary is issued in the station office and the command office.
[0069]
In the case of the failure of the transmission / reception related device with the failure location number 13 to 18 and the failure of the cab monitor with the failure location number 19, monitoring with the cab monitor is impossible for the composite image of the failure system. In addition, since all images are available at the central command station, the display can be switched to perform backup monitoring of a predetermined image (composite or single image) on the station office monitor and the command station monitor. An associated alarm is also issued.
[0070]
Next, the normal operation and the backup operation at the time of failure will be described with reference to FIGS.
[0071]
6 is used when the train side image captured at the station platform on the ground at the normal time is transmitted to the cab of the train and the crew of the cab monitors the image in the system configuration of FIG. The equipment is shown. In this example, components that function when the vehicle enters the overline platform are indicated by solid lines. That is, the home camera is photographed by the monitoring cameras 1 and 2, the two screens are synthesized by the screen synthesizer 6, and the video is transmitted to the cab monitoring monitor on the vehicle via the light transmission circuit unit 14 and the light transmitter 16. Represents what to do. The portion indicated by the broken line corresponds to the underline side.
[0072]
FIG. 7 shows the failure state of the monitoring cameras A1 and B2, the video distributor A5, and the screen synthesizer A6 (these are indicated by “x” in the figure) which are related devices on the ground in the system configuration of FIG. However, when a failure that does not detect the video sync signal is detected and output, the equipment for switching and displaying the monitoring video of the train to the related station office or central command station is indicated by a solid line, and other equipment is displayed. This is indicated by a broken line. As a specific example, when the monitoring camera A1 breaks down, the remaining video of the monitoring camera B2 of the same overline home is not synthesized on the screen, and the video switchers 25 and 28 of the station office and the central command station are passed through the modulator B9. And is switched to select this video. When the screen synthesizer A6 breaks down, the images of the monitoring cameras A and B that do not synthesize the screen are transmitted via the modulator B9 to the monitoring station in the station office and the central command station, and are monitored by the two monitoring monitors. The
[0073]
FIG. 8 shows modulators A8 and B9, video distributor B12, light transmitter circuits A14 and B15, light transmitters A16 and B17, light receivers B35 and C36, and light receiver circuits which are related devices on the ground in FIG. B37, C38 failure status is monitored, and when a failure that does not detect the video carrier signal is detected and output, the equipment for switching the monitor video of the train to the relevant station office or central command center is highlighted. As shown.
[0074]
In addition, when the video carrier signal of the modulator and the video distributor is not detected, when the video carrier signal of the ground side light transmission circuit unit and light transmitter is not detected, or the image of the ground side light receiver and light reception circuit unit Since the carrier frequency is different from the case where no carrier signal is detected, it is possible to identify the failed device. Except when the modulator or video distributor fails, backup at the station office and central command center Monitoring is possible.
[0075]
FIG. 9 is similar to FIG. 7, but in the system configuration of FIG. 2, the failure state of the monitoring camera, the video distributor 5, and the screen synthesizer 6 that are related devices on the ground is monitored, and the video synchronization signal is not detected. When a failure is detected and output, the equipment used to output a warning to the effect that the monitoring video of the train has been switched to the relevant station office or central command station and displayed is highlighted. is there.
[0076]
FIG. 10 is similar to FIG. 8, but the modulators A8 and B9, the video distributor B12, the light transmission circuit units A14 and B15, the light transmitters A16 and B17, and the light receivers that are related devices on the ground in FIG. B35, C36, the failure state of the light receiving circuit parts B37, C38 are monitored, and when a failure in which the video carrier signal is not detected is detected and output, the monitoring image of the train is switched to the relevant station office or central command office. The equipment used to output a warning indicating that it has been displayed is highlighted.
[0077]
FIG. 11 shows a case where the failure state of the light receiver A19, the light receiving circuit unit A20, the light transmission circuit unit C33, and the light transmitter C34, which are related devices on the vehicle, is detected and output in FIG. The equipment for switching and displaying the monitoring video of the train to the related station office and the central command station is highlighted. If only the light transmission circuit unit or light transmitter fails, monitoring can be performed with the cab monitoring monitor, but backup monitoring is also performed at the station office and the central command station just in case.
[0078]
FIG. 12 is similar to FIG. 11, but monitors the failure state of the light receiver A19, the light receiver circuit unit A20, the light transmitter circuit unit C33, and the light transmitter C34, which are related devices on the vehicle in FIG. Is displayed with emphasis on the equipment used to output a warning to the effect that the monitoring video of the train has been switched to the relevant station affairs room or the central command station. is there. In this case as well, if only the light transmission circuit unit or the light transmitter fails, monitoring can be performed by the cab monitoring monitor, but for the sake of safety, alarm output is also performed at the station office and the central command station.
[0079]
In the present embodiment, the train-to-train video transmission has been described using optical space transmission by near-infrared rays. However, from the viewpoint of transmitting video, the same applies to methods such as millimeter wave, LCX, and spread spectrum.
[0080]
In addition to outputting the failure state detection result as described above, the failure state detection result is also output to a device such as a facility management facility (not shown) that monitors the failure state of the device. May be.
[0081]
【The invention's effect】
According to the present invention, when a driver performs side monitoring of a train in a railway, the following effects can be expected in backup of a situation in which related equipment breaks down and monitoring by a driver's cab cannot be performed.
[0082]
(1) When backup monitoring cannot be performed because the video carrier signal of the ground device is “disconnected” and / or the synchronization signal “no” after demodulating the video carrier signal is disabled, Outputs a warning to the station office. As a result, the driver has informed the commander by train radio that the display on the driver's cab is no longer possible, and the commander has contacted the station staff to request monitoring at the home. Compared to what has been done, it is possible to respond quickly.
[0083]
(2) When the video carrier signal “disconnected” of the on-vehicle device and / or the synchronization signal “none” after demodulating the video carrier signal is detected and a failure is recognized, the video cannot be monitored on the cab. At this time, compared to the case in which the operator was informed by the train radio that the display on the driver's cab was not possible and the commander performed backup monitoring by tracking the relevant train. It is possible to respond quickly before the contact from the person.
[0084]
(3) Since the failure of the ground equipment is detected, it becomes possible to promptly respond to the maintenance department.
[0085]
(4) Since the failure of the on-vehicle equipment is detected, it is possible to promptly contact the department that performs maintenance.
[Brief description of the drawings]
FIG. 1 shows an external view of a system according to the present invention in which images taken by ground-side cameras installed before and after a home are combined on a screen and transmitted to a vehicle by optical image transmission to a train and displayed on a monitoring monitor of a driver's cab. It is explanatory drawing which shows schematic structure by.
2 is a block diagram showing a configuration viewed from a functional aspect of the system of FIG. 1;
FIG. 3 is a block diagram of a video signal determination unit used in the configuration of FIG.
4 shows a concept of detecting a lack of a video carrier signal in the video signal determiner of FIG.
5 represents a failure determination flowchart of a failure state due to a video carrier signal “disconnected” and / or a synchronization signal “none” after video carrier signal demodulation in the video signal determiner of FIG. 3;
FIG. 6 is an explanatory diagram of equipment for transmitting a video of a train side face taken at a station platform on the ground in the normal state to the cab of the train and monitoring the video by the crew of the cab. is there.
FIG. 7 monitors the failure state (video synchronization signal not detected) of related equipment on the ground in FIG. 2, and when a failure is detected and output, the station office related to the train monitoring video, the central command It is explanatory drawing of the equipment for switching to a place and making it display.
FIG. 8 monitors the failure state (video carrier signal not detected) of related equipment on the ground in FIG. 2, and when a failure is detected and output, the station office related to the train monitoring video, the central command It is explanatory drawing of the equipment for switching to a place and making it display.
FIG. 9 monitors the failure state (video synchronization signal not detected) of related equipment on the ground in FIG. 2, and when a failure is detected and output, the station office associated with the monitoring video of the train, the central command It is explanatory drawing of the equipment for performing the alarm output to switch to a place and to display.
FIG. 10 monitors the failure state (video carrier signal not detected) of related equipment on the ground in FIG. 2, and when a failure is detected and output, the station office associated with the monitoring video of the train, the central command It is explanatory drawing of the equipment for performing the alarm output to switch to a place and to display.
FIG. 11 monitors the failure state of the related equipment on the vehicle in FIG. 2, and when the failure is detected and output, the monitoring image of the train is switched to the related station office or central command station and displayed. It is explanatory drawing of the equipment for.
FIG. 12 monitors the failure state of related equipment on the vehicle in FIG. 2, and when the failure is detected and output, the monitoring video of the train is switched to the related station office and central command center and displayed. It is explanatory drawing of the equipment for performing the warning output to the effect.
[Explanation of symbols]
1-4 ... surveillance cameras A, B, C, D
5 ... Video distributor A
6-7 ... Screen synthesizers A, B
8 to 11: Modulators A, B, C, D
12 ... Video distributor B
13 ... Video signal determination device A
14 to 15: Light transmission circuit parts A and B
16-17 ... Transmitters A and B
18 ... Vehicle
19 ... Receiver A
20: Light receiving circuit part A
21 ... Video signal determination unit B
22 ... cab monitoring monitor receiver
23. Analog multiplexed optical transmitter
24. Analog multiplexed optical receiver
25 ... Station service room video switcher
26-27 ... Station office monitoring monitor receivers A and B
28 ... Command station video switcher
29-32 ... Command station monitoring monitor receivers A, B, C, D
33 ... Light transmission circuit part C
34 ... Transmitter C
35 ... Receiver B
36. Light receiver C
37. Light receiving circuit part B
38. Light receiving circuit part C
39 ... Failure information collector
40 ... Station service room video switching control device
41 ... Station room video switching alarm output device
42 ... Command station image switching control device
43 ... Command station video switching alarm output device
101 ... Input terminal section
102: Output terminal section
103: Video distribution unit
104 ... Video carrier signal detector
105: Video signal demodulator
106 ... Video synchronization signal detector
107, 108 ... Failure information output terminal section

Claims (11)

A monitoring means for taking a video of the side of the train entering the station, transmitting the video to the cab of the train and monitoring it on the cab monitor;
Detecting means for detecting a video carrier signal “disconnected” of the monitoring video and / or a synchronization signal “none” after demodulating the video carrier signal in order to detect a failure state of the related device of the monitoring means;
When a detection output is generated from the detection means, the monitoring video of the train is displayed on a backup monitor provided in at least one of a related station office or central command station according to a predetermined method. The cab monitor backup system. 2. The cab monitor backup system according to claim 1, wherein a plurality of different images are transmitted for transmission of a plurality of images on a train side surface in a ground facility that captures and transmits images of a train side surface among the related devices of the monitoring means. Using the video carrier signal of the carrier frequency, the detecting means detects the failure state by the video carrier signal “disconnected” and / or the synchronization signal “none” after demodulating the video carrier signal for each video carrier frequency. Driver's cab monitor backup system. 3. The cab monitor backup system according to claim 1, wherein the detection unit includes a video carrier signal “disconnected” and / or a synchronization signal after demodulating the video carrier signal in an on-vehicle facility among the related devices of the monitoring unit. “No” is detected, and the output of the failure state by detecting the video carrier signal “disconnected” and / or the synchronization signal “no” after demodulating the video carrier signal is transmitted from the light transmitter on the vehicle to the ground equipment by the optical signal. A cab monitor backup system characterized in that it performs. The cab monitor backup system according to any one of claims 1, 2, or 3, wherein the detected failure state output is a video carrier signal of a train side surface imaged at various places by analog multiplex transmission (broadband transmission). A driver's cab monitor backup system which is multiplexed and sent to the station office and / or central command office. In the driver's cab monitor backup system according to claim 4, all of the images taken by a plurality of surveillance cameras and the images after processing these images are transmitted to the station office and / or the central command office, A driver's cab monitor backup system that selects and displays a screen to be monitored on the station office and / or central control station side. 6. The cab monitor backup system according to claim 5, wherein selection of the screen to be monitored is automatically performed in accordance with an output of the failure state. 7. The cab monitor backup system according to claim 6, wherein when a failure state is not detected, the screen to be monitored is selected based on a screen selection input by a user. 7. The cab monitor backup system according to claim 6, further comprising an alarm output means for outputting an alarm indicating that the selection of the screen has been automatically performed in the station office and / or a central command station. The cab monitor backup system. 2. The cab monitor backup system according to claim 1, further comprising an alarm output unit that outputs an alarm to the effect that the station staff should perform visual monitoring at the platform in the station office and / or the central command station. Driver's cab monitor backup system. 6. The cab monitor backup system according to claim 5, further comprising a synthesizer for synthesizing a plurality of videos for cab monitoring, wherein the synthesized video and the video before synthesis are simultaneously combined with the station office and / or the center. Driver's cab monitor backup system characterized by transmission to the command center. 11. The cab monitor backup system according to claim 10, wherein when detecting that the synthesizing device has failed, the video to be transmitted is controlled and displayed in the station office and / or the central command station. When it is detected that a modulation device that modulates a failure has occurred, the synthesized video that should have been transmitted to the cab monitor and / or the video before the synthesis is displayed in the station office and / or the central command office. Driver's cab monitor backup system.

Images