KR100742311B1 - Subway Real Time Mobile High Quality Digital Broadcast System - Google Patents

Abstract

The present invention relates to a subway real-time digital high-definition mobile broadcasting system, comprising: a broadcast transmitting apparatus for transmitting a high-definition satellite broadcasting signal through a wireless transmitting station or a high-definition cable broadcasting signal through a cable broadcasting center; A broadcast relay device provided in a subway station for receiving, converting and transmitting a high definition satellite broadcast signal and a high definition cable broadcast signal transmitted from the broadcast transmission device; The present invention relates to a subway real-time digital high-definition mobile broadcasting system provided in a subway vehicle, and including a mobile broadcast receiving apparatus for receiving a signal transmitted from the broadcast relay device and converting the image / audio signal into a high-definition viewable image.

Subway real-time digital high-definition mobile broadcasting system according to the present invention increases the stability of the system by simplifying the hardware to receive the real-time SD-class digital high-definition broadcast without a separate storage device in the receiver provided in the subway vehicle, up to 720 × 480 It has an image size and a high quality video signal of 2Mbit / s or more can lower the price and maintenance cost of the product while maintaining the same screen quality as a general TV without the restriction of the playback screen.

Subway real-time digital high-definition mobile broadcast, mobile receiver, broadcast relay device, high quality video / audio

Description

Subway Real Time Mobile High Quality Digital Broadcast System

1 is an overall configuration diagram of a subway real-time digital high-definition mobile broadcasting system according to the present invention.

2 is a data flow diagram of a subway real-time digital high-definition mobile broadcasting system according to the present invention.

Fig. 3 is a block diagram showing the structure of a broadcast signal conversion unit in the broadcast relay device of the present invention.

4 is a block diagram showing the configuration of a radio transmitting unit in the broadcast relay device of the present invention.

5 is a block diagram showing the configuration of a mobile broadcast receiving apparatus according to an embodiment of the present invention;

The present invention relates to a subway real-time digital high-definition mobile broadcasting system, more specifically, a high-definition level digital of 2Mbit / s or more while having a maximum image size of 720 × 480 in real time without a separate storage device in a subway car operating at high speed The present invention relates to a subway real-time digital high-definition mobile broadcasting system that can receive and watch broadcasts.

Existing subway broadcasting system uses a storage device in a vehicle to reproduce the repetition of stored broadcast contents or use a wireless LAN technology while the vehicle enters and stays in history, and downloads and retransmits broadcast data to the storage device and retransmits it. Was used. Therefore, this system inevitably needs a storage device for broadcast contents, and this storage device does not reproduce high-quality broadcast data due to the frequent limitations in the special environment such as subway or the limitation of time to receive broadcast data. There was a problem of reducing the reliability of the entire service.

Korean Patent Application No. 39596 and Registered Utility Model No. 211953 disclose a "multimedia broadcasting system in subway", but the storage capacity has to be provided because a DVD (Digital Video Disk) player having broadcast data stored in a train is provided. Due to the limitation of the real-time broadcasting is difficult, there is a problem that decreases the reliability of the service due to frequent failures.

In addition, satellite DMB broadcasting currently in commercial service or terrestrial DMB broadcasting, which is to be serviced, provides low-capacity broadcasting contents through relatively small screens. In particular, satellite DMB broadcasts can only provide up to 768Kbit / s video quality, while terrestrial DMB broadcasts can only provide up to 352 × 288 video size. Therefore, these two services are not suitable for transmitting and receiving high-definition video signals of 2Mbit / s or more at the same time for playing large screens, and are limited to mobile broadcast receivers that support only small screens.

The present invention was created to solve the above problems, and does not have a separate storage device in the subway vehicle, has a maximum 720 × 480 image size in real time during the movement, the digital quality of SD level of 2Mbit / s or more An object of the present invention is to provide a subway real-time digital high-definition mobile broadcasting system that can receive broadcasts and play them without restriction on the screen size.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention for achieving the above technical problem will be described in detail.

1 is an overall configuration diagram of a subway real-time digital high-definition mobile broadcasting system according to the present invention.

Referring to Figure 1, the subway real-time digital high-definition mobile broadcasting system according to the present invention transmits a high-definition satellite broadcast signal through a radio transmitting station (10a) or a broadcast transmission for transmitting a high-definition cable broadcasting signal through a cable broadcasting center (10b) Device 10; A broadcast relay device 20 provided in a subway station for receiving, converting and transmitting a high definition satellite broadcast signal and a high definition cable broadcast signal transmitted from the broadcast transmission device 10; The mobile broadcasting receiver 30 is configured to receive a signal transmitted from the broadcast relay device 20 and convert the signal into a high quality video / audio signal for viewing.

Referring to FIG. 1, the broadcast transmission apparatus 10 converts the high definition broadcast content into a high definition satellite broadcast signal by the radio transmitting station 10a of the broadcast transmission apparatus 10 and transmits the signal to the satellite. It is transmitted to each subway station through the cable broadcasting center (10b) is also changed to a high-definition cable broadcasting signal is transmitted to each subway station through a cable network.

2 is a data flow diagram of a subway real-time digital high-definition mobile broadcasting system according to the present invention.

Referring to FIG. 2, the broadcast relay device 20 includes a satellite broadcast signal receiver 21 and a satellite broadcast signal receiver 21 for receiving and amplifying a high quality satellite broadcast signal transmitted from the broadcast transmitter 10. The broadcast signal converter 22 for separating and reprocessing a specific channel from the satellite broadcast signal received from the broadcast signal and the high-definition cable broadcast signal received from the broadcast transmitting device 10, and the broadcast signal converter 22 And a wireless transmitter 23 for amplifying the signal and transmitting the signal to the mobile broadcast receiver 30.

The satellite broadcast signal receiver 21 receives a high frequency satellite broadcast signal transmitted from the satellite broadcast transmitter and a frequency down signal for down converting the signal received by the antenna 21a. ) A converter 21b and an amplifier 21c for amplifying the signal output from the frequency down converter 21b. One satellite broadcast signal receiver 21 is installed in each subway station.

3 is a block diagram showing the configuration of a broadcast signal converter of the broadcast relay device of the present invention.

The broadcast signal converting unit 22 is responsible for separating and reprocessing a specific channel in the high-definition satellite broadcast and cable broadcast transmitted as a multiplexed stream and sending it to the wireless transmitter 23. One such broadcast signal converter 22 is installed in each history or several histories.

Referring to FIG. 3, the broadcast signal converter 22 includes a satellite broadcast channel extractor 100, a cable broadcast channel extractor 200, and a signal generator 300. The satellite broadcasting channel extractor 100 and the cable broadcasting channel extractor 200 are composed of channel extraction PLL modules 101 and 201, demodulation modules 102 and 202, FEC modules 103 and 203, and demultiplex modules 104 and 204. The signal generator 300 includes a multiplex module 301, a channel coding module 302, a modulation module 303, and an up conversion module 304.

Here, the channel extraction PLL module 101 of the satellite broadcasting channel extractor 100 selectively outputs only signals of frequency bands corresponding to a set level range from the signals output from the satellite broadcasting signal receiving unit 21.

The satellite signal output from the channel extraction PLL module 101 is demodulated by the demodulation module 102 and output as an original signal.

The FEC module 103 automatically corrects an error of the original signal output from the demodulation module 102 and outputs an original signal in which the error is corrected.

The original signal output from the FEC module 103 is demultiplexed by the demultiplex module 104 and transmitted to the signal generator 300.

On the other hand, the channel extraction PLL module 201 of the cable broadcasting channel extractor 200 selects only signals of frequency bands corresponding to a range of setting levels from signals output from the cable broadcasting center 10b of the broadcasting transmitter 10. Will print

The signal output from the channel extraction PLL module 201 is demodulated by the demodulation module 202 and output as an original signal.

The FEC module 203 automatically corrects an error of the original signal output from the demodulation module 202 and outputs an original signal in which the error is corrected.

The original signal output from the FEC module 203 is demultiplexed by the demultiplex module 204 and transmitted to the signal generator 300.

In addition, the multiplex module 301 of the signal generator 300 multiplexes and outputs the channel signals output from the satellite broadcasting channel extractor 100 and the cable broadcasting channel extractor 200.

The channel signal multiplexed in the multiplex module 301 is coded by the channel coding module 302.

The channel signal coded by the channel coding module 302 is modulated by the modulation module 303, and the signal modulated by the modulation module 303 is UHF / VHF or L-BAND by the Up conversion module 304. It is converted to a band and output.

4 is a block diagram showing the configuration of a radio transmitting unit in the broadcast relay device of the present invention.

The wireless transmitter 23 is installed in a section between history and history based on a link budget of a wireless section. An amplifier and an antenna are installed at certain sections to provide UHF / VHF or L-BAND RF POWER that can be received from a subway vehicle. It is a way to send.

Referring to FIG. 4, the radio transmitter 23 includes an amplifier 23a, a divider 23b, and a transmit antenna 23c. The amplifier 23a amplifies the broadcast signal received from the broadcast signal converter 22, and the amplified signal is distributed by the splitter 23b, and is transmitted to the subway vehicle through the transmission antenna 23c. It is sent out.

5 is a block diagram illustrating a configuration of a mobile broadcast reception apparatus according to an embodiment of the present invention.

As shown in the drawing, the mobile broadcast receiving apparatus includes a setter 400 for inputting and outputting an inverse distance signal, a receiving antenna 500 for receiving a broadcast signal transmitted from the broadcast relay device, and the setter 400 A mobile broadcast receiver 600 for processing the distance signal received from the mobile station, demodulating the broadcast signal received from the reception antenna 500, and decompressing and transmitting high quality video / audio compression, and the mobile broadcast receiver 600. It includes an LCD display 700 for reproducing a high quality video / audio signal received from.

The setter 400 includes a distance signal input module 401 for receiving an inverse distance and an information signal output module 402 for processing and outputting a signal input from the distance signal input module 401. .

In addition, the mobile broadcast receiver 600 includes a control signal conversion module 601, a reverse guidance processing module 602, a channel extraction PLL module 603, a demodulation module 604, an FEC module 605, and a demultiplexer ( 606, a decoder 607, and a video signal conversion module 608.

Here, the control signal conversion module 601 of the mobile broadcast receiver 600 converts the signal received from the setter 400 into a signal that can be used by the reverse guidance processing module 602 and outputs it.

The reverse notice processing module 602 receives the signal converted by the control signal converting module 601 to generate and process the reverse notice and the related subtitle information.

The channel extraction PLL module 603 selectively outputs only a signal of a frequency band corresponding to a range of a set level from a broadcast signal received from the receiving antenna 500. The demodulation module 604 demodulates the signal output from the channel extraction PLL module 603 and outputs an original signal. The FEC module 605 automatically corrects an error of the original signal output from the demodulation module 604 according to the set FEC code, and outputs an original signal in which the error is corrected.

The demultiplexer 606 separates original signals from the multiplexed signals output from the FEC module 605 and the reverse announcement processing module 602. The signal separated by the demultiplexer 606 is decoded by the decoder 607 into a video signal of 2Mbit / s or more and a high quality audio signal having a maximum screen size of 720 × 480, and decoded by the decoder 607. The output audio signal is directly transmitted to and reproduced by the LCD display 700, and the image signal is converted into a high quality image signal having a 720 × 480 screen size that can be reproduced on the LCD by the image signal conversion module 608. It is transmitted to the LCD indicator 700 and reproduced.

As described above, although the present invention has been described by way of limited embodiments and drawings, the terms or words used in the present specification and claims are not to be construed as being limited to ordinary or dictionary meanings, and are consistent with the technical spirit of the present invention. It must be interpreted as meaning and concept. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

As described above, the subway real-time digital high-definition mobile broadcasting system according to the present invention has a maximum of 720 × 480 image size in real time without a separate storage device in the subway car receiver and receives a digital broadcast of SD quality level of 2Mbit / s or more By simplifying the hardware so that the screen size can be played without restriction, it can provide high quality digital broadcasting, increase the stability of the system, and lower the price and maintenance cost of the product.

Claims (11)

A broadcast transmitting device for transmitting a high quality satellite broadcasting signal through a wireless transmitting station or a high quality cable broadcasting signal through a cable broadcasting center; A broadcast relay device provided in a subway station for receiving, converting and transmitting a high definition satellite broadcast signal and a cable broadcast signal transmitted from the broadcast transmission device; It is provided in the subway car, and receives the signal transmitted from the broadcast relay device to convert the station distance signal to output a high-quality audio / video signal having a maximum 720 × 480 image size and more than 2Mbit / s image quality A setter for inputting and outputting, a receiving antenna for receiving a high quality broadcast signal transmitted from the broadcast relay device, processing a distance information signal received from the setter and guide / announced subtitle information, and receiving the received signal from the receiving antenna. Subway real-time digital consisting of a mobile broadcast receiver that demodulates a high-definition broadcast signal and decompresses and transmits audio / video compression, and a mobile broadcast receiver equipped with an LCD display for reproducing high quality audio / video signals received from the mobile broadcast receiver. In the high quality mobile broadcasting system, The setter of the mobile broadcast reception device, A distance signal input module for receiving a distance between stations, and And an information signal output module for processing and outputting a signal input from the distance signal input unit. The mobile broadcast receiver of the mobile broadcast receiver, A control signal conversion module for converting and outputting a signal received from the setter; A reverse guidance processing module for processing the reverse guidance by receiving the signal converted by the control signal conversion module; A channel extraction PLL module for outputting only a signal having a frequency band corresponding to a range of a set level in a UHF / VHF or L-BAND signal received from the receiving antenna; A demodulation module for demodulating a signal output from the channel extraction PLL module and outputting an original signal; An FEC module which automatically corrects an error of an original signal output from the demodulation module according to the set FEC code, and transmits an original signal in which the error is corrected; A demultiplexer for separating original signals from the multiplexed signals output from the FEC module and the reverse guidance processing module, A decoder which decodes the signal separated by the demultiplexer into a high quality video signal and a high quality audio signal having a maximum image size of 720 x 480 and a quality of 2 Mbit / s or more, and Subway real-time digital high-definition mobile broadcasting system comprising a video signal conversion module for converting the video signal output from the decoder to a video signal that can be reproduced on the LCD. delete delete delete delete delete delete delete delete delete delete

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