JPS6225030Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a station information display device suitable for facilitating railway train operation management operations.

In recent years, railway train operation management has adopted a so-called function-intensive control system, in which the entire line section is managed in a central control room, and control of signals, points, etc. is performed centrally.

In this centralized control method, CTC
(Centralized Traffic Control) In other words, centralized train control is a method of remotely controlling a large number of signal equipment over a wide area from a single point, that is, a control center, and instructing train operation. Displays train information such as train position and train number on the display board,
The train operation manager monitors this display and performs various controls to ensure that the train runs smoothly.

FIG. 1 is a system diagram for explaining an example of this train centralized control CTC. In the figure, TN ₁ ,
TN ₂ ... indicates a train, and ST ₁ , ST ₂ ... indicates CTC station equipment. And CET is CTC central equipment,
CONT is a control panel in the control room of the CTC central unit CET, and DP is a display panel that displays various information from the CTC central unit CET.
The CTC station devices ST ₁ , ST ₂ . . . are connected via a transmission line L, and are configured to display the operating status of the trains TN ₁ , TN ₂ . Note that the arrow CNT indicates control, and the arrow COND indicates conditions.

The feature of this centralized train control CTC function is that all information related to train operation management is displayed on the display panel of the control center's CTC central unit CET.
By displaying the information on the DP using lamps, etc., the train operation status of the line section can be comprehensively understood by observing the display panel DP.

However, this information centralization function cannot be used at stations that do not have a display function. This creates an inconvenience in that the staff has no choice but to contact the central staff by telephone or call each station to inform them of the situation.In particular, when a train is delayed, each station informs passengers of the situation. Therefore, it is necessary to frequently make inquiries to the central station regarding the current location and status of trains.

On the other hand, when a train is delayed due to some kind of accident or breakdown, the central operation manager is usually busy recovering the train and dealing with the ripple effects, and may not be able to respond to inquiries from each station. This often leads to social problems such as passenger dissatisfaction and anxiety caused by this lack of information.

As a means to solve such problems,
It is also possible to use a television camera to photograph the display panel DP of the CET, the CTC central unit in the control center where various reports are displayed, and to distribute the images to each station and monitor them using television receivers at each station. .

However, if such a method uses a general video transmission system, it is necessary to install a dedicated cable for television between each station due to the frequency occupied bandwidth, which increases the equipment cost.
Not practical.

In view of the above points, the present invention provides a station information display device designed to solve these problems. ) and telephone lines and exchanges, and on the receiving side, a telephone and a low-speed scan television receiver with an afterglow function are used. It is designed to be used to receive images on an SSTV receiver.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, in order to facilitate understanding of the present invention, SSTV used in the present invention will be explained. This SSTV system differs from commercial broadcasting in that it transmits video by reducing the occupied frequency bandwidth, and the image quality also decreases as the bandwidth is reduced.

However, the bandwidth is determined based on resolution considerations such as the video transmission time (the time it takes to complete one picture) and the number of scanning lines, and if it is limited to the telephone band of about 3KHz, the video transmission time (the time it takes to complete one picture), the number of scanning lines, etc. cannot be transmitted, and the image is centered on a static image. When considering increasing the utilization rate of existing telephone equipment, it is necessary to find a compromise with the resolution to some extent.

Now, the information required at each station is not the ever-changing information necessary for control, but the condition of the entire track, the position of the train, and the details (numbers) of trains heading from neighboring stations to the own station.

Therefore, unlike commercial television systems,
Since the image being shot is limited to the display panel, even if the image quality is degraded to some extent, the functionality will not be affected. In addition, since the train movement display and other display information that appear on the display panel are slow, it is normal that there is no problem even if the scanning time for one frame is reduced.

For this reason, the number of scanning lines and the performance of one frame scanning time in television have been reduced.
If SSTV transmits image information that falls within the telephone band, it can be controlled and transmitted to each station using existing equipment such as telephone exchanges and telephone lines.
Images from the center display panel can be transmitted,
This will enable both train information transmission and economic benefits.

FIG. 2 is a system diagram showing an embodiment of the station information display device according to the present invention, and only the parts necessary for explanation are shown. In the figure, CE indicates the central unit, STA,
STB and STC indicate A station, B station, and C station, respectively. The central equipment CE is equipped with a display panel DP that displays train information such as the train position and train number at each station and each track, and SSTV cameras CMA ₁ and CMA ₂ that separately photograph the train operation status on this display panel DP. , and a telephone exchange TX ₁ that connects the video signals obtained by the SSTV cameras CMA ₁ and CMA ₂ to the required stations to the required stations. configured to send. Here, this telephone exchange TX ₁ constitutes a means for distributing the centralized train operation status as images to each station via telephone lines.

TX ₂ central equipment via telephone line cable CBL
A receiving telephone exchange connected to the CE telephone exchange TX ₁ , and from this telephone exchange TX ₂ respectively A station
It is switched and connected to ST _A , B station ST _B , and C station ST _C.

On the other hand, at each of the receiving stations ST _A to ST _C , a telephone set (not shown) and a display having a persistence function are provided.
The device has DP _A , DP _B , and DP _C , and telephone dial DL _A ,
The designated display positions are transmitted to _the SSTV receivers TV _A , TV _B , _and
It is configured to be received on TV _C.

Next, the operation of the embodiment shown in FIG. 2 will be explained. Here, specific numerical values are used as examples for clarity of explanation.

First, an example of the relationship between image signal modulation degrees of the well-known SSTV transmission system (monocolor/black and white) is shown in FIG. In FIG. 3, the arrow FD indicates frequency shift, and the arrow MOD indicates modulation degree.

That is, theoretically SSTV camera CMA ₁ ,
The number of scanning lines is 1 for images captured separately by CMA ₂ .
If it is divided into 28 lines and calculated as 8 seconds to transmit one screen, the maximum frequency _nax is _nax = 1/2Kn ² pb/h・y/x where K=0.7, n=128 (scanning (number of lines), p = 1/8 (number of strokes per second), b/h = 4/3 (screen aspect ratio), y/x = 0.95/0.84 (x (y) horizontal (vertical) scanning line effective rate), then, _nax = 1/2 x 0.7 x (128) ² x 1/8 x 4/3
A bandwidth of ×0.95/0.85=1068 [Hz] is required.

For reference, here is an example of standard broadcast television: _nax = 1/2 x 0.7 x (525) ² x 30 x 4/3 x 0.95/0.84 = 4.3 x 10 ⁶ [Hz
] It is.

Now, as we all know, telephone lines are approximately 300 to 3700Hz.
This means that the bandwidth
With a 1068Hz image and a signal with the necessary signal frequency as a synchronization signal, the image signal can be transmitted to each ABC station ST _A , ST _B , and ST _C through the telephone line cable CBL.

In other words, the train operation status centralized in the central unit CE is transmitted through the telephone exchange TX ₁ and the telephone line cable.
Images can be distributed to each station ST _A , ST _B , and ST _C through CBL.

Next, looking at the information content that is requested to be obtained from the display panel DP of the central equipment CE at each station ST _A , ST _B , and ST _C , we can see that detailed information about the operation status around the own station is available, and information about distant locations is Once the conceptual situation is understood, there will be no problem with announcements for passengers.

Therefore, the display panel DP of the central equipment CE is divided into the display sizes required by each station, and the
Install an SSTV camera CMA to take pictures of the display panel DP, connect the switched cameras to the classified cameras, and connect the telephone line to each station ST _A ,
You can select the camera (select the position of the display panel) using the phone dial DL from ST _B , ST _C ...

Note that this exchange would be even more effective if it could eliminate the "busy" state like a regular telephone and provide a function that allows a single camera to be freely connected to each station.

In addition, in the above embodiment, the case where two SSTV cameras are used to transmit information to station A ST _A , station B ST _B , and station C ST _C was explained as an example, but the present invention is limited to this. The number of cameras can be expanded to several, and the number of stations can be expanded as needed.

As explained above, according to the present invention, SSTV
By using telephone lines, the contents of the control room display panel of the central equipment, where information is centralized, can be monitored at each station, and the information can be used effectively at each station, which will help relieve passenger anxiety and provide better service in the event of an emergency. The practical effect is extremely large, as it can help improve safety as well as improve safety. Furthermore, since a telephone line can be used, it is extremely effective in that it can be operated economically and the device can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a system diagram for explaining an example of a conventional train centralized control system, Fig. 2 is a system diagram showing an example of a station information display device according to the present invention, and Fig.
FIG. 2 is an explanatory diagram showing an example of the relationship between the image signal modulation degrees of the transmission method of the SSTV method to provide an explanation of the operation of the diagram. CE...Central unit, DP...Display panel, CMA ₁ ,
CMA ₂ ...SSTV camera, TX ₁ , TX ₂ ...Telephone exchange, CBL...Telephone line cable, ST _A to ST _C
Station, DP _A to DP _C ...display, DL _A to DL _C ...telephone dial, TV _A TV _C ...SSTV receiver.

Claims (1)

[Scope of utility model registration request] A display panel that displays train information such as the train position and train number of each station and each track on the central equipment side;
A low-speed scan television device is equipped with a camera that takes pictures of each section of this display panel and has a reduced frequency bandwidth. Each station on the receiving side is equipped with a telephone and a low-speed scan television receiver having an afterglow function. A station information display device characterized in that an image is received by the television receiver through a telephone line.