JPH031623A - Data transfer system for vehicle information reception system - Google Patents

Abstract

PURPOSE:To transfer data accurately and to improve the service to passengers by sending a stored data to a vehicle and displaying the received data onto a monitor. CONSTITUTION:A ground stationary station 1 transfers a transfer data for several number of times, a receiver side of a train 2 compares a preceding transfer data with a current transfer data and fetches only a coincident data. Moreover, the train 2 sends a carrier when it is stopped in a station premises and the ground stationary station 1 receives the carrier. Since the ground stationary station 1 discriminates it that the train 2 is in the station premises, the data transfer from the ground stationary station 1 to the train 2 is much automated.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention displays text broadcasts and various information transferred from a ground station on a display device in each car of a moving object, such as a train, and provides various information to passengers. The present invention relates to a data transfer method for a new vehicle information receiving system.

[Conventional example] In recent years, teletext broadcasts of various information have been multiplexed into television broadcasts, and with a teletext adapter, these teletext broadcasts can be received with a regular television receiver, making it easy for anyone to receive the information. But now it can be used. On the other hand, various advertisements are posted on trains, and these various advertisements serve as a source of information. In addition, as a service for passengers, modern trains provide various information to passengers by, for example, displaying satellite broadcasts received through parabolic antennas on the television receivers (LCD televisions) in each car.
There are some services that are unprecedented.

[Problem to be solved by the invention] By the way, fading (f
It is difficult to directly receive text broadcasts that are multiplexed with television broadcasts.

Therefore, it is conceivable to receive the teletext while the train is stopped. However, since one page of teletext data is transmitted in about 20 seconds,
To receive all pages of one program, a waiting time of about the total number of pages x 20 seconds is required, so all programs and all pages of the teletext broadcast can be received within a stop time of several tens of seconds to one minute. difficult to do.

This invention was made in view of the above points, and its purpose is to be able to accurately transmit teletext and various information to the vehicle side, and to provide the teletext and various information to passengers in the vehicle. An object of the present invention is to provide a data transfer method for a vehicle information receiving system that enables the following.

[Means for Solving the Problems] In order to achieve the above object, the present invention converts digital data of teletext and various information stored in a terrestrial fixed station into serial data.

The present invention is a data transfer method for a vehicle information receiving system in which the serial data is transferred to a vehicle and the teletext and various information based on the serial data are displayed on a display device in the vehicle.

When the serial data is transferred when the vehicle is stopped, the serial data is in a packet data format, and the transfer speed of the serial data is set to a predetermined value.

In addition, the above packet data format is a data block, a data packet, or a data line as transfer data,
These transferred data include error detection/correction codes.

[Function] Since the above method is used, when pre-stored teletext programs/pages or other information data are transferred from a terrestrial fixed station, those data are transferred data in the above packet data format, and the The data string resulting from the transfer data is transferred to the stopped train using radio waves or light. Then, the train side receives the transferred data using the packet data method, and detects and corrects errors in programs, pages, or other information data based on the error detection/correction code included in the transferred data. will be held.

At this time, an arbitrary bit rate can be selected as the transfer data transfer rate, and a data block, a data packet, or a data line can be selected as the packet data format.

Therefore, data from the ground fixed station is transferred accurately and quickly to the receiving side of the train.

[Implementation example] Embodiments of the present invention will be described below with reference to the drawings.

In Figure 1, the vehicle information receiving system is a ground fixed station (hereinafter referred to as ground station) that is fixedly installed, for example, in a station premises, and converts data such as received text broadcasts or information input via telephone line into serial data and transmits the serial data. station) 1, and a train (mobile body) 2
It is composed of.

The above-mentioned ground station 1 contains data of all programs and pages of teletext received by the television antenna 3 and other information inputted via the telephone line by the information human power device (captain system) 4. a data memory 5 for storing the teletext;
The teletext receiver 6 controls the storage of the data and converts the stored data into serial data (11111, '0' signal) and outputs it, and the error detection and correction code (check) necessary for this serial data. an error detection/correction code generator 7 that adds a check code, etc.); a signal converter 8 that converts the serial data including the check code etc. into a signal to be transmitted by radio waves or light; a signal transmitter 9 that transfers the received signal to the receiving side of the train 2 by radio waves or light, and a monitor that displays the teletext or other information based on the received teletext and data stored in the data memory 5. A device (liquid crystal display device) 10 and a remote control 11 for issuing various control instructions to the teletext receiver 6 are provided. In addition,
As shown in FIGS. 2 to 4, data transfer is performed in a packet data format using data blocks, data packets, or data lines, and any of these packet data formats can be selected. Also, as shown in FIG.

If data block is selected as the packet data format, a check code for error detection/correction code is attached, but if other data packet or data line packet data formats are selected, this is not necessary. No 6 The train 2 is composed of a plurality of connected cars A,...N, and the conductor's room 12 of the train 2 receives radio waves or optical signals from the ground station 1 while the train is stopped.
A signal receiving unit 13 that has the function of restoring the data string from the received radio waves or light and detecting data errors.
Then, the data string is used to correct errors in teletext and other information data, and the error-corrected data is stored in a predetermined area of the internal memory, and the stored data is sequentially read out to comply with the teletext standard. format data string, and superimposes this data string on an NTSG standard video signal and outputs it, and converts the video signal on which the data string of text broadcasting and other information is superimposed into an RF double signal. A transmitter (RF' modulator) 15 and 1 transmit a video signal from a normal video cassette, etc. to the transmitter 1.
5 is provided. Each vehicle A,...,N is equipped with a distributor 17 for distributing the RF multiplied signal, and a plurality of decoders for decoding teletext, other information, video cassette images, etc. from the distributed RF multiplied signal. A text receiver 18 and a plurality of monitor devices 19 for displaying the text broadcasts, other information, videos of video cassettes, etc. are provided, and the distributor 17 and the transmitter I5 are connected to each other by a cable (coaxial cable). ) 20 and are connected via a booster 21.

In addition, in the signal transmitter 9 and the signal receiver 13, the data transfer rate is equal to the teletext bit rate (5,
7272 Mbps), can be set to any value, and can be transferred synchronously or asynchronously.

Next, the operation of the data transfer method of the vehicle information receiving system configured as described above will be explained based on the schematic diagrams of transferred data shown in FIGS. 2 to 8.

First, in the ground station 1, the data of all programs and all pages of the teletext received via the antenna 3 according to instructions from the remote controller 11 and information data of the captain system are stored in the data memory 5. Furthermore, it is assumed that these data are stored in the data memory 5 before the train 2 enters the station where the ground station 1 is installed. At this time, data block + PFX (prefix) is stored in the data memory 5 in the case of teletext broadcasting. When the train 2 stops at the station, the ground station 1 reads out predetermined data from the data memory 5, and transfers the predetermined data in a packet data format. Note that the packet data format is selected in advance between the ground station 1 and the receiving side of the train 2, that is, data blocks, data packets, or data lines are used as the transferred data.

Here, when the packet data format of the data block shown in FIG. 2 is selected, the data sequentially read from the data memory 5 is
(bit) serial data. In this case, the serial data (data block) does not have a check code for detecting and correcting data errors during transfer, but
The error detection/correction code generator 7 adds the check code. In this way, a check code is added to the data block to form transfer data, and the transfer data is further made continuous to form a data string. Furthermore, in the case of teletext data, delimiter data is added to the data string at portions corresponding to program and page delimiters. Furthermore, as shown in FIG. 5, transfer start data is added to the beginning of the transfer data including the check code.
Transfer end data is added at the end.

When transferring a continuous data string consisting of transfer start data, transfer data, and transfer end data, if the data transfer is synchronous, synchronization codes called synchronization characters are added before and after each data string. (as shown in Figure 6), like this.

The data string including the synchronization code is transferred to the receiving side of the train 2 by radio waves or light, and the transfer rate at this time is an arbitrary value set in the signal transmitter 9 and the signal receiver 13. As shown in FIG. 7, when the data transfer is performed asynchronously, a start bit and a stop bit are added to the data string in units of 8 bits. in this case.

The data transfer speed is slower than the synchronous method described above, so it is used when there is little information to be transferred.

In addition, in the teletext receiver 6 of the ground station 1.

As in the conventional case, the received teletext can be displayed on the monitor device 10, and furthermore, any program of the teletext stored in the data memory 5 and other information can be displayed on the monitor device 10. Therefore, the teletext and other information stored in the data memory 5 can be displayed on the monitor device 10 and checked before being transmitted to the train 2.

On the other hand, the signal receiving unit 13 of the stationary train 2 receives the radio wave or light, but if it is a synchronous type, after two characters of the synchronization code are received in succession, the subsequent data is processed as data. Since reception is performed, transfer start data,
Data strings of transfer data and transfer end data are sequentially received. At this time, the signal receiving unit 13 performs data error detection in the data string, and upon error detection, processing for data retransmission, for example, a request for data retransmission, is notified to the ground station 1. The serial data string restored in this way is input to the character signal generator 12, and in this character signal generator 12, transfer data is extracted based on the transfer start data and transfer end data, and the transfer data is Check code included in the data (in addition to PFX)
: prefix), data errors and corrections are performed, and data of a predetermined program/page in the case of text broadcasting is stored in a predetermined area of the internal memory using single-delimited data.

In the above embodiment, the BES adds a check code to the data block transferred in the packet data format.
Although the T method is adopted, a redundant bit adding method may be used when only error detection is performed, and a self-correction method or a retransmission correction method may be used when performing correction.

Also, as shown in FIGS. 3 and 4.

If a packet data format in which data packets or data lines are used as transfer data is selected, there is no need to add check codes to those data packets or data lines. It is done in the same way as for blocks.

In this way, at the ground station 1, the digital data (text information code) of all arbitrary programs and pages of the teletext broadcast instructed by the remote control 11 etc. and the captain system information are stored in the data memory 5 in advance. When the train 2 stops at the station, the stored data is converted into a serial data string in the form of data blocks, data packets, or data lines, with a check code added, and this data string is That train 2
Since the data is transferred to the computer, high-speed data transfer is possible, and accurate data transfer is also possible.

In addition, the above ground station 1 transfers the transfer data several times, and the receiving side of the train 2 compares the previous transfer data with the current transfer data, and only takes in data that match. , accurate data transfer is possible. Further, when the train 2 stops in the station yard, the carrier is launched, and the ground station 1 receives the carrier.

Thereby, the ground station 1 can determine that the train 2 is within the station premises, so data transfer from the ground station 1 to the train 2 can be further automated.

[Effects of the Invention] As explained above, according to the data transfer method of the vehicle information receiving system of the present invention, the ground fixed station uses a packet data format in which pre-stored data is added with a check code and transferred as data. The vehicle receives the data in the packet data format, corrects errors in the received data, and displays teletext and various information corresponding to the received data on the monitor device. As a result, it is possible to perform accurate data transfer, and also to provide passengers with various information services, various event and tourist information services, and to improve services to passengers. It can also be used as an advertising medium.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a data transfer method of a vehicle information receiving system showing an embodiment of the present invention, and FIGS. 2 to 8 are schematic diagrams of data formats in the data transfer method of the vehicle information receiving system. be. In the figure, 1 is a ground station (ground fixed station), 2 is a train (moving vehicle), 3 is a television antenna, 4 is an information input device, 5 is a data memory, 6 is a teletext receiver, and 7 is error detection/correction. code generator, 8 is a signal converter, 9 is a signal transmitter, 10.1
9 is a monitor device, 13 is a signal receiver, 14 is a character signal generator, 15 is a transmitter (RF modulator), 16 is a VTR device, 17 is a distributor, 18 is a character receiver, 20 is a cable (
(coaxial), 21 is a booster. Figure 2 Figure 3 Patent applicant: Fujitsu General Co., Ltd. Representative Patent attorney Takuya Ohara Figure 4

Claims (1)

[Claims] (1) Converting digital data of teletext and various information stored in a terrestrial fixed station into serial data, and
A data transfer method for a vehicle information receiving system that transmits this serial data to a vehicle and displays the teletext and various information based on the serial data on a display device in the vehicle, and the vehicle information is transmitted when the vehicle is stopped. A data transfer method for a vehicle information receiving system, characterized in that, when transferring the serial data, the serial data is in a packet data format, and the transfer speed is variable to a predetermined value. (2) Convert the digital data of teletext and various information stored in the fixed terrestrial station into serial data, transfer this serial data to a vehicle, and use the vehicle to perform the teletext and other information based on the serial data. A data transfer method for a vehicle information receiving system that displays information on a display device, wherein the serial data is transferred at least twice when the vehicle is stopped, and the serial data is transferred at least twice. A data transfer method for a vehicle information receiving system, characterized in that the vehicle side compares previous and current serial data and inputs matched data. (3) A data transfer method for a vehicle information receiving system according to claim 1 or 2, wherein the serial data is in a packet data format in which transfer data is a data block, a data packet, or a data line. (4) A data transfer method for a vehicle information receiving system according to claim (1), wherein an error correction code is added to the serial data to be transferred. (5) Claim (1), wherein a transfer start code and a transfer end code are added before and after the data in the packet data format;
The data transfer method of the vehicle information receiving system described in (2) or (3).