KR100762792B1 - Multi channel video transmission system for railcar - Google Patents

Abstract

A multi channel video transmission system for an electric railcar is provided to transceive video signals of multi channels through one line in the electric railcar, thereby reducing equipment costs and ensuring larger inner space of the railcar. A VGA(Video Graphic Array)(110) converts video signal of multi channels, generated in a video generator(100), into electronic signals. A modulator(120) modulates the electronic signals of multi channels. A channel mixer(130) mixes the modulated signals of multi channels so that the modulated signals of multi channels can be transmitted through one line. A transmitting device has a transmitter(140) for amplifying and transmitting the mixed signal of multi channels. A receiver(150) receives the transmitting signals of multi channels. A demodulator(160) demodulates the receiving signals of multi channels through a demodulation method corresponding to the modulation method performed in the modulator. One or more tuners(170,171) select the demodulated signals of multi channels according to each channel frequency. A receiving device has one or more monitors(180,181) for displaying a video corresponding to the tuning signals of multi channels inputted from the one or more tuners.

Description

Multi-Channel Video Transmission System for Electric Vehicles {MULTI CHANNEL VIDEO TRANSMISSION SYSTEM FOR RAILCAR}

1 is a block diagram showing a conventional image transmission system for electric vehicles.

2 is a block diagram showing a multi-channel video transmission system for an electric vehicle according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: image generator

110: VGA (Video Graphic Array)

120: modulator 130: channel mixer

140: transmitter 150: receiver

160: demodulator 170, 171: tuner

180, 181: monitor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multichannel video transmission system, and more particularly, to a multichannel video transmission system for a train capable of transmitting and receiving video signals of multiple channels on a single line in an electric vehicle.

Hereinafter, with reference to the accompanying drawings will be described a problem of a conventional electric vehicle image transmission system.

1 is a configuration diagram showing a conventional video transmission system for electric vehicles. As shown in FIG. 1, two image transmission cables must be installed in order to transmit two channel images. Therefore, two image generators 10 and 11, VGAs 20 and 21, and transmitters 30 and 31 are respectively provided. , Receivers 40 and 41 and monitors 50 and 51 are required. In particular, in order to transmit more than two channel video, there is a problem that the cost is greatly increased because the number of cables and the number of the corresponding equipment is too large.

In addition, in the case of transmitting a plurality of video signals through a plurality of video cables in the conventional video transmission system for electric vehicles, the number of jumper connection points and connectors (CONNECTOR) between the vehicle and the vehicle increases, as described above. As the number of receivers and other accessories increases, it is difficult to secure space in a vehicle cabin.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a multi-channel video transmission system for a vehicle that can transmit and receive video signals of a plurality of channels in one line in the electric vehicle.

According to an aspect of the present invention, there is provided an image generator for generating a video signal of a plurality of channels to be reproduced in an electric vehicle, a VGA for converting the video signal of the plurality of channels generated by the video generator into an electronic signal corresponding thereto. A modulator for modulating the electronic signals of the plurality of channels received from the channel, a channel mixer for mixing the modulated signals of the plurality of channels received from the modulator through a single line, and amplifying the mixed signals of the plurality of channels received from the channel mixer A demodulator for demodulating a plurality of channel received signals from the transmitter, a demodulated method corresponding to a modulation method performed by the modulator, and a demodulator received from the demodulator Multi-channel demodulation signal for each channel frequency At least one tuner to select and at least one monitor for displaying an image corresponding to the tuning signal of the plurality of channels received from the at least one tuner.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a multi-channel video transmission system for a train according to the present invention.

As shown in FIG. 2, the multi-channel video transmission system for an electric vehicle according to the present invention includes an image generator 100, a VGA 110, a modulator 120, a channel mixer 130, a transmitter 140, and a receiver ( 150, demodulator 160, first and second tuners 170, 171, and first and second monitors 180, 181.

The image generator 100 generates a plurality of channel image signals to be reproduced by the first and second monitors 180 and 181 of the electric vehicle, and the VGA 110 generates a plurality of channel image signals generated by the image generator 100. The signal is converted into an electronic signal of a plurality of channels corresponding thereto. That is, the maximum resolution, the reproduction period, and the number of colors that can be represented are determined according to the VGA 110.

The modulator 120 modulates the electronic signals of the plurality of channels received from the VGA 110 so as to be suitable for transmission, and the channel mixer 130 mixes the modulated signals of the plurality of channels so that they can be transmitted through one line. Do this.

The transmitter 140 amplifies the mixed signals of the plurality of channels received from the channel mixer 130 and transmits them to the receiver 150 of the electric vehicle side, and the receiver 150 receives the received signals of the plurality of channels received from the transmitter 140. Receive and input to demodulator 160.

The demodulator 160 demodulates the input signal to the first and second tuners 170 and 171 in a demodulation scheme corresponding to the modulation scheme performed in the above-described modulator 120, and inputs the first and second tuners 170. , 171 selects demodulated signals of a plurality of channels for each channel frequency and inputs them to the first and second monitors 180 and 181. Here, there are two tuners, but this number is exemplary, and there may be two or more arbitrary numbers of tuners.

The first and second monitors 180 and 181 output images corresponding to the plurality of channel tuning signals received from the first and second tuners 170 and 171 described above. Here, there are two monitors, but this number is exemplary and there may be two or more any number of monitors.

On the other hand, in general, the image generator 100, the VGA 110, the modulator 120, the channel mixer 130, and the transmitter 140 are installed on the land transmitting side, and the receiver 150, the demodulator 160, and the first unit are provided. And the second tuners 170 and 171 and the first and second monitors 180 and 181 are installed in the electric vehicle receiving side, that is, in the electric vehicle vehicle.

The multi-channel video transmission system described above uses a kind of TV video transmission system. That is, the TV video transmission method is a method of mixing and transmitting the video data of a plurality of channels by RF, it is possible to install a tuner at the receiving end to select and output a desired channel of the video data of the plurality of channels, according to the present invention It is similar to the operation method of the channel video transmission system.

However, the environment in which the electric vehicle is operated is generally inferior to the TV video transmission / reception environment, and the electric mechanical environment and the ambient temperature should be taken into consideration. It is inevitable to transmit video of lower quality than video.

However, in the case of transmitting an image signal through an optical cable, the amount of transmission data per unit time is very large, thereby maximizing the quality of the image and being hardly affected by electrical noise. In other words, if the optical cable is used as a video transmission cable, the above-mentioned environmental limitations can be overcome, and considering that the current video data quality is lower than the TV video quality (480i) (MPEG 2 is the most advanced quality). The quality deterioration is unlikely to be a concern.

In addition, as shown in FIG. 2, a modulator 120 and a channel mixer 130 are added at the video signal transmission side, and demodulators 160 and tuners 170 and 171 should be added at the video signal receiving side. The equipments are relatively inexpensive equipment and can reduce the number of circuits of the video transmission cable to 1 line, and also the number of channels of the transmitter 140 and the receiver 150 corresponding to the relatively expensive equipment in the video transmission system. Regardless of one, it is advantageous in terms of cost.

In addition, unlike the conventional video transmission system for electric vehicles requiring as many transmitters, receivers and other accessories as the number of video channels, the multi-channel video transmission system for an electric vehicle according to the present invention uses one transmitter, receiver and other accessories. Is also advantageous in securing the vehicle space of the electric vehicle.

As described above, the transmission system of the video signal is mainly described, but it is apparent to those skilled in the art that the same principle according to the present invention can be applied to a multi-channel audio transmission system for an electric vehicle. In addition, for convenience of description, as an example, the video signal of two channels has been described. However, the multi-channel video transmission system for an electric vehicle according to the present invention may be applied to video signals of two or more channels. It is obvious to those skilled in the art.

In the above, the present invention has been described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and those skilled in the art without departing from the gist of the present invention. The various changes and modifications can be made by.

As described above, the present invention can transmit and receive video signals of multiple channels through a single line in an electric vehicle, thereby reducing the cost of equipment and securing a space inside the vehicle of a wider electric vehicle.

Claims (3)

An image generator for generating image signals of a plurality of channels to be reproduced in an electric vehicle vehicle; A VGA for converting the image signals of the plurality of channels generated by the image generator into electronic signals corresponding thereto; A modulator for modulating an electronic signal of a plurality of channels received from the VGA; A channel mixer for mixing a plurality of channels of modulated signals received from the modulator to be transmitted through one line; A transmitter including a transmitter for amplifying and transmitting a mixed signal of a plurality of channels received from the channel mixer; A receiver for receiving a transmission signal of a plurality of channels from the transmitter; A demodulator for demodulating received signals of a plurality of channels received from the receiver in a demodulation scheme corresponding to a modulation scheme performed in the modulator; One or more tuners for selecting demodulated signals of a plurality of channels received from the demodulator for each channel frequency; And a receiving device having one or more monitors for displaying images corresponding to the tuning signals of the plurality of channels received from the one or more tuners. The method of claim 1, Wherein said one line is an optical cable. The method according to claim 1 or 2, And said receiver, said demodulator, said at least one tuner and said at least one monitor are installed in said electric vehicle vehicle.

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