CN100438611C - City underground passenger information system of using DVB digital TV technique based on IP network - Google Patents
City underground passenger information system of using DVB digital TV technique based on IP network Download PDFInfo
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Abstract
The present invention discloses an urban underground passenger information system of using a DVB digital TV technique based on an IP network, which is composed of a control center subsystem, a station subsystem and a transmission network, wherein the center subsystem is composed of a digital video server, a broadcast control working station, a network manager/operator server, a center database server, a network encoder, a medium material gateway, a video-audio switching matrix, a video-audio digital-to-analog/analog-to-digital converter, a digital TV device, an external signal source, a center integrated management software and a transmission interface; the station subsystem is composed of an LED passenger guiding card, an interface board, a communication controller, a power communication controller, a control computer, a passenger information broadcasting controller, a station broadcasting server, a plasma display and a video-audio digital to analog converter. The station subsystem plays real-time information coming from the control center through a transmission channel, and can superimpose the information of the station on the basis of the real-time information.
Description
Technical field
The present invention relates to a kind of city underground computer management information system, be based on the underground passenger information system of IP network DVB digital television techniques specifically.
Background technology
Passenger's information system of part city underground is based on passenger's information system of network flow-medium computer Display Technique at present.Its basic comprising, major function, leading indicator, system upgrade extended capability, video transmission mode, image quality, display effect, broadcast fail safe, control and management pattern.
1) basic comprising
Passenger's information system of Streaming Media computer Display Technique Network Based mainly is made of control centre's equipment, station equipment and transmission network.
The center capital equipment has: data server, multimedia video server, broadcast Control work station, NM server, operator workstation, coffret etc.Control centre carries out advertising message editor, management, audit with the signal source that records, form a series of Streaming Media material with MPEG-2 or MPEG-4 compress mode, broadcasting list according to the formulation of operation needs, the content that needs are play uploads to data server and multimedia video server, by transmission network message transmission is arrived each station presentation controller again.
The station capital equipment has: PDP display, VGA signal distributor, presentation controller, operator workstation, coffret etc.Train station subsystem is downloaded by transmission network and is made the network flow-medium information that is stored on the hard disk in advance from control centre, utilizes network flow-medium computer Display Technique to play on platform PDP display with the VGA display mode through the station presentation controller.Adopt the VGA mode signal output, a chassis station ONU On-Air Workstation can drive 4 plasma panels and show.
The transmission network port bandwidth is 100M.
2) major function
But videotex, animation, video files.
The program of playing in the subwindow can auto zoom to the demonstration that is fit to subwindow.
Each split screen subwindow can independent play-out information separately.
A plurality of programs of downloaded stored in advance automatically according to more new situation, entry-into-force time, the out-of-service time of broadcasting list, are selected the broadcast that makes an explanation of correct timetable.
Station ONU On-Air Workstation provides the program data of MPEG-4 of storage more than 1 hour, so that transmission network provides backup to broadcast when breaking down.
Can be according to different priority levels, the information of high priority can end to interrupt in progress low priority information according to predefined rule, the preferential broadcast.
By the mathematical formulae simulation train arrival time.
3) leading indicator
Coded system: MPEG-4
Picture format: 352 * 288
Hard disk: 270GB
Network interface card: 100M Ethernet card
4) system upgrade extended capability
Based on the VGA display mode, realize the system extension function by increasing website control appliance and display terminal.
5) video transmission mode
Adopt hard-disc storage to play and the VGA display mode 30 meters of platform VGA transmission ranges.
6) image quality
The employing code check is that the stream media format of MPEG-4 carries out the compression of video and audio frequency, and video resolution can reach 352 * 288.
7) display effect
Show that by the VGA interface demonstration of information can reach 8, call the sluggishness (issue of information mainly relies on the disposal ability of computer) that might cause picture more than 8 modules.
8) broadcast fail safe
Establishment audit does not in advance support time-delay to broadcast and monitor on-the-spot broadcast content.
9) control and management pattern
Decentralized control, centralized management.
This system exists real-time poor controllability, image quality not high, the information coverage rate is little, the system upgrade extended capability is poor, video transmission apart from weak point, broadcast poor stability, train arrival information is forbidden, can not be carried out live telecast, does not use dynamic display technology to realize that the broadcast level video broadcasts.
Summary of the invention
Technical problem to be solved by this invention is to overcome the defective that prior art exists, and a kind of underground passenger information system of IP based network DVB digital television techniques is provided.
The present invention is for realizing the purpose of foregoing invention, and the technical scheme of being taked is,
The underground passenger information system of IP based network DVB digital television techniques, adopt the IP/DVB encapsulation mechanism, MPEG-2TS stream is driven in the middle of the IP bag, deliver to corresponding transmission channel then, pass to each station by transmission network, through being reduced to video/audio signal and showing at display terminal.
The underground passenger information system of IP based network DVB digital television techniques is made of control centre's subsystem, train station subsystem and transmission network.
Control centre's subsystem by digital video frequency server, broadcast Control work station, center webmaster/operator's server, central database server, network encoder, media materials gateway, look the audio frequency switching matrix, look audio frequency digital-to-analogue/analog to digital converter, digital television devices, outside source, center integration Management software, coffret etc. constitute a complete broadcast and centralized control system.Simultaneously, center subsystem also will provide a plurality of and interface other system, be responsible for the whole system equipment working state is monitored and the centralized management of network system, also comprise the collection of external information stream, the editor who broadcasts format, video flowing conversion, broadcast the functions such as storage of control, system monitoring, system information, be the center of underground passenger information system (PIS) centralized management and control.Establish broadcast Control work station terminal in control centre (OCC), control by the OCC duty director.Establish hub operators work station and center network management workstation at machine room, mainly be responsible for maintenance, the management of PIS system.
Train station subsystem by LED passenger's guide board, interface board, communication controller, power supply communication controller, control computer, passenger's information presentation controller, station broadcasting server, plasma display, look audio digital to analog converter, station management software, coffret and constitute.Train station subsystem is by the real time information of transmission channel broadcast from control centre, and the information of the our station that can superpose on its basis, as train running information and all kinds of customized informations etc.Be in charge of the data of passenger information service system, the passenger information service system in the centralized monitor station in the station, receiving center subsystem and be distributed to the editor of importing and derivation, the passenger information service system release information in the station of each display terminal, the external system data of the passenger information service system in the station, the station affair information in standing and preservation etc.
The underground passenger information system that the present invention is based on the DVB digital television techniques of IP network embodies the beneficial effect of the invention from the following aspects.
1) has real-time video broadcasting and TV programme and relay function.
2) can issue real-time train running information to the passenger.
3) central authorities' control and management at control centre or station, can be monitored the operating state of each display terminal node, and the issue of information does not need people's post, has reduced personnel's deployment cost.
4) can specified message be presented on the display screen in the time of appointment, have good priority control and subregion control ability.
5) system supports multiple display terminal, can adopt plasma panel, LCDs, LED display, and practicality and autgmentability are strong.
6) can be with the parallel issue of plurality of regions on screen information, the multidate information of multizone issue in real time, information area can be more than 20.
7) support that multi-medium data intercuts functions such as mode and random data insertion, for operation management person provides flexible, rich and varied data, audio frequency and video.
8) support dynamically with the plurality of regions on screen play mode.The subwindow structure of screen, layout configurations, resolution etc. can dynamically change according to the preestablishing of timetable, and the change of layout does not need to restart machine.
9) station ONU On-Air Workstation can the automatic maintenance program of automatic triggering system every day, deletes useless program data automatically, increases system reliability.
10) the MPEG-2 code stream DVB-IP transmission of video technology of employing 8Mb/s, picture quality reaches the studio rank, and whole process total digitalization is handled, and guarantees that final effect reaches digital television broadcasting level picture quality.
11) the system upgrade extended capability is strong: the expansion by centering calculation word video server DVB output channel can increase the channel that the station is broadcasted, and can provide more Additional Services by the DVB technology.Can the broadcasting of high definition TV be can directly support by increasing the module of video server, standard definition television and high definition television broadcasting and the transient mode of depositing also can be supported.
12) video transmission distance: based on the image quality of 720 * 576 * 25 frame/seconds, platform SDI transmission range is greater than 80 meters.
13) display effect is good: system core equipment is based on hardware handles, and information shows the zone that can support more than 20.
Broadcast safe: on the basis of establishment audit in advance, system can delay time and broadcast and monitor on-the-spot broadcast content.Can when program is relayed, program be carried out broadcasting after the buffered again, guarantee the fail safe of programme content.
Description of drawings
Fig. 1 is the underground passenger information system composition frame chart that the present invention is based on the DVB digital television techniques of IP network;
Fig. 2 is a center subsystem control program block diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment: show the underground passenger information system of the DVB digital television techniques of IP based network as Fig. 1.
Adopt the IP/DVB encapsulation mechanism, MPEG-2TS stream is driven in the middle of the IP bag, deliver to corresponding transmission channel then, pass to each station by transmission network, through being reduced to video/audio signal and showing at display terminal.
Basic comprising
The underground passenger information system of the DVB digital television techniques of IP based network is made of control centre's subsystem, train station subsystem and transmission network.
Control centre's subsystem by digital video frequency server, broadcast Control work station, center webmaster/operator's server, central database server, network encoder, media materials gateway, look the audio frequency switching matrix, look audio frequency digital-to-analogue/analog to digital converter, digital television devices, outside source, center integration Management software, coffret constitute a complete broadcast and centralized control system.Simultaneously, center subsystem also will provide a plurality of and interface other system, be responsible for the whole system equipment working state is monitored and the centralized management of network system, also comprise the collection of external information stream, the editor who broadcasts format, video flowing conversion, broadcast the functions such as storage of control, system monitoring, system information, be the center of underground passenger information system (PIS) centralized management and control.Establish broadcast Control work station terminal in control centre (OCC), control by the OCC duty director.Establish hub operators work station and center network management workstation at machine room, mainly be responsible for maintenance, the management of PIS system.
Signal processing flow: outside source is by normal video, audio interface and look the audio frequency switching matrix and link to each other, and looks the audio frequency switching matrix and exports the accurate video-audio signal of a road sign to monitor, is used to monitor outside source; The standard analog video-audio signal of looking audio frequency switching matrix output after looking audio frequency digital-to-analogue/analog to digital converter and handling with the SDI interface to the digital video frequency server transmission of digital signals; Digital video frequency server with the SDI interface respectively to network encoder, media materials gateway, look audio frequency digital-to-analogue/analog to digital converter and send digital signal, network encoder links to each other with the RJ45 interface digital signal that receives with the media materials gateway with the transmission network switch, and sends IP network DVB digital video-audio signal to transmission network.Looking audio frequency digital-to-analogue/analog to digital converter shows with the standard analog video-audio signal sdi signal processing back that digital video frequency server sends on monitor.Broadcast the Control work station by OCC duty director control, send RS-422 interface control signal control figure video server by operation Broadcast Control program module.Center webmaster/operator's server links to each other with the transmission network switch with the RJ45 interface, mainly is responsible for maintenance, the management of PIS system.Database server links to each other with the transmission network switch with the RJ45 interface, mainly is responsible for storage, maintenance, the management of PIS system.
The train station subsystem capital equipment has: LED passenger's guide board, interface board, communication controller, power supply communication controller, control computer, passenger's information presentation controller, station broadcasting server, plasma display, look audio digital to analog converter, station management software, coffret etc.Train station subsystem is by the real time information of transmission channel broadcast from control centre, and the information of the our station that can superpose on its basis, as train running information and all kinds of customized informations etc.Be in charge of the data of passenger information service system, the passenger information service system in the centralized monitor station in the station, receiving center subsystem and be distributed to the editor of importing and derivation, the passenger information service system release information in the station of each display terminal, the external system data of the passenger information service system in the station, the station affair information in standing and preservation etc.
Train station subsystem mainly shows that by control and platform two parts constitute:
Control section
The control section of train station subsystem is placed on the control room, station.
The station broadcasting server links to each other with the transmission network switch with the RJ45 interface, receives to handle the real time information of playing from control centre, and the information (as train running information and all kinds of customized informations etc.) of the our station that superposes on its basis.Be responsible for the editor of importing and derivation, the passenger information service system release information in the station of external system data, the station affair information in standing and preservation etc.
Passenger's information presentation controller links to each other with the transmission network switch with the RJ45 interface, is in charge of Customer information, the passenger information service system in the centralized monitor station in the station, calls station broadcasting server data and be distributed to each display terminal of the passenger information service system in the station.
Look audio digital to analog converter and receive the sdi signal that passenger's information presentation controller sends, handle the back and on LED passenger's guide board monitor and plasma display, show with the standard analog video-audio signal.
On/descending LED display controller: receive the videography information that OCC transmits by videography transmission network (ICP/IP protocol) respectively, receive train running information respectively from the ATS system by three road interface adapters.On/descending LED display controller is the data message aggregation process, offers data sharing in PIS and the station local area network.
Long line driver card: this card inserts the LED display controller, is to realize local real time's information on the display is transmitted for the RS-422 level that is fit to long line transmission by coding, compression, level conversion, and transmission range is greater than 200 meters.
Interface adapter: by the train running information of station interface box (SIC) reception from the ATS system, realize communicating by letter between master control borad and the controlled board, comprise all information of transmitting between master control borad and the controlled board, the train running information that reception is handled well is transferred to passenger's information presentation controller by communication port, and passenger's information presentation controller is transferred to PDP display screen, dual base color guide passenger board and DTI after the train running information that receives is handled again.
The power supply communication controller: is RS-232 level conversion in the power control signal RS-485 level, have shake hands, function such as signal monitoring.
Timer (DTI) communication controller of dispatching a car: with RS-232 level conversion in the DTI control signal is the RS-485 level, have shake hands, function such as signal monitoring.
Full-automatic multi-computer switch: the display of realizing multiple computers switches.
The platform display part
LED passenger's guide board: platform dual base color LED display (double-sided display), receive to show/train operation real time information that descending LED display controller sends, by bus safety instruction, transfer information, news, weather information, government notice, temporary circular and emergency information, literal picture advertising message, synchronised clock etc.
Platform full-color LED display screen: receive to show/train operation real time information that descending LED display controller sends safety instruction, transfer information by bus, news, weather information, government notice, temporary circular and emergency information, literal picture advertising message, synchronised clock etc.Train operation real time information, video ads information, tour reference, all kinds of living information, entertainment, synchronised clock, TV programme etc.
Platform PDP display screen: receive to show/train operation real time information that descending passenger's information presentation controller sends safety instruction, transfer information by bus, news, weather information, government notice, temporary circular and emergency information, literal picture advertising message, synchronised clock etc.Train operation real time information, video ads information, tour reference, all kinds of living information, entertainment, synchronised clock, TV programme etc.
The timer (DTI) of dispatching a car: platform dual base color LED display (single face demonstration) receives on showing/train operation real time information that descending LED display controller sends.
Transmission network is that gigabit Ethernet (switch of 2 core layers and 3 convergence-levels is two redundant) port bandwidth is greater than 100M.
Major function
Can be with the parallel issue of plurality of regions on screen information, the multidate information of multizone issue in real time, information area can show on same display screen simultaneously more than 20, also can show below information separately:
The train operation real time information
By bus safety instruction, transfer information
News, weather information
Government notice, temporary circular and emergency information
Literal picture advertising message and video ads information
Tour reference, all kinds of living information
Entertainment
Synchronised clock
TV programme etc.
Have real-time video broadcasting and TV programme and relay function, can broadcast in real time and demonstration Multimedia Dynamic passenger information on corresponding display screen.Can broadcast live to the activity that underground passenger is concerned about, relay programs such as Chinese Central Television's " news hookup ", important competitive sports, news.
The full-order system emergency function.When emergency takes place, can interrupt the normal information issue immediately, and pass through the form of literal, image alarm, remind passenger's urgent danger prevention.
Perfect ad distribution platform.System is except also providing the distribution platform of an advertisement for the passenger provides the riding information and all kinds of information of necessity for the metro operation merchant.The type of advertisement can be television video advertisement, the advertisement that also can broadcast picture and literal.The issue form of advertising message is versatile and flexible.
Multiple display screen combines.System supports multiple display terminal, can adopt plasma panel, LCDs, LED display, also can adopt the display mode of multiple display screen combination to carry out the issue of information.
Friendly user interface.System provides friendly operation interface for the user, and the user only need carry out simple operations by keyboard and mouse can set up information issue interface very attractive in appearance, and can access the effect of What You See Is What You Get.The mode that the issue of each site information is adopted centralized control and broadcasted automatically, the issue of information does not need people's post, has not only avoided artificial operate miss, and has reduced personnel's deployment cost.
Can specified message be presented on the display screen in the time of appointment, have good priority control and subregion control ability.
Central authorities control and management can be carried out,, the operating state of each display terminal node can be monitored at control centre or station, can Long-distance Control guide passenger board, the opening and closing of the displays such as timer of dispatching a car.
Adopt modularized design, interface and device extension are easy.
All information broadcast machines of system are provided with independent IP address, all defer to ICP/IP protocol, snmp simple network management protocol is set up perfect network management system, realizes functions such as online each terminal presentation facility node power control and management, status poll, parameter setting, warning, warning processing.
Support that multi-medium data intercuts functions such as mode and random data insertion, for the various data of network operator's managing rich, audio frequency and video provide flexibility.Simultaneity factor possesses the ability of broadcast level transmission (MPEG-2TS flow transmission standard) analog television program, and other windows at display terminal broadcast passenger's information when relaying the real-time television program.
Support dynamically with the plurality of regions on screen play mode.The subwindow structure of screen, layout configurations, resolution etc. can dynamically change according to the preestablishing of timetable.The change of layout does not need to restart machine.
The program of playing in the subwindow can auto zoom to the demonstration that is fit to subwindow.
A plurality of programs of downloaded stored in advance automatically according to more new situation, entry-into-force time, the out-of-service time of broadcasting list, are selected the broadcast that makes an explanation of correct timetable.
Station ONU On-Air Workstation provides the MPEG-2 of storage more than 2 hours or the program data of MPEG-4, so that transmission network provides backup to broadcast when breaking down.
Can be according to different priority levels, the information of high priority can end to interrupt in progress low priority information according to predefined rule, the preferential broadcast.
Station ONU On-Air Workstation can the automatic maintenance program of automatic triggering system every day, deletes useless program data automatically.
System adopts the broadcast level digitizer, reduces the video quality that transmission attenuation guarantees broadcast level.
Adopt the MPEG-2 code stream DVB-IP transmission of video technology of 8Mb/s, picture quality reaches the studio rank, and whole process total digitalization is handled, and guarantees that final effect reaches digital television broadcasting level picture quality.
Can one day/one week be divided into each period arbitrarily according to timetable, can be arranged to the split screen layout of any appointment at each period.Each split screen subwindow can be carried out the timetable of any appointment again separately, and specified order on schedule, plays each program sequence circularly.
Leading indicator
Disk array mode: RAID-3
Recording capacity: 720GB
Inner HDD interface: SCSI-2Fast/Wide single-ended
Sample frequency Y:13.5MHz
R-Y，B-Y：6.75MHz
Quantize: 8 bits
Compress mode: MPEG-2 4:2:2 P@ML
MPEG-2MP@ML
Bit rate: MPEG-2 main profile at main level 1.5 to 15Mb/s
MPEG-2 4:2:2 P@ML 3.0 to 24Mb/s (long GoP)
MPEG-2 4:2:2 P@ML 25 to 50Mb/s (I frame)
625/50：576?lines(PAL)
The input of dual track simulation Balanced Audio;
MPEG1-LII and Dolby Digital
TM(AC-3) audio coding
Video noise abatement and motion compensation function
Software is selected MPEG2 coded format---4:2:0 or 4:2:2
Digital to analog converter can provide compound and the Y/B-Y/R-Y interface simultaneously.
One road SDI goes into, and two-way SDI encircles out,
Four road composite videos go out or one road component and a tunnel compound
Support NTSC and PAL
The system upgrade extended capability
Expansion by centering calculation word video server DVB output channel can increase the channel that the station is broadcasted, and can provide more Additional Services by the DVB technology.Native system has been supported digital television broadcasting at present, and can directly support the broadcasting of high definition TV by increasing the module of video server, also can support standard definition television and high definition television broadcasting and the transient mode of depositing.
The video transmission mode
Because the system transmissions mode adopts the technology of DVB over IP, high-quality DVB MPEG-2TS stream can be by the 100M Ethernet to the digital form transmission of each station with multicast and multicast, and video pictures reaches the broadcast level quality.
Image quality
System has adopted the coding staff of MPEG-S TS stream, and realization DVB Digital Television is carried out high-quality data broadcasting under limited bandwidth condition, and image encoding still can reach the quality of broadcast level under the contractive condition of 8mb/s.
Display effect
System core equipment is based on hardware handles, and main demonstration computing is by the processing of hardware integrated circuit board, and display effect is less demanding to the disposal ability of computer, and information shows smooth, and information shows the zone that can support more than 20.
Broadcast fail safe
On the basis of establishment audit in advance, system can delay time and broadcast and monitor on-the-spot broadcast content.Can when program is relayed, program be carried out broadcasting after the buffered again, guaranteed the fail safe of programme content.
The control and management pattern
Centralized control, centralized management." " center " is strengthened the system administrator at center to the management mode of " station " to system's employing, has reduced administrative staff, by different personnel's authority setting, has distinguished administrative staff's responsibility simultaneously.Each station need not the professional operator, has reduced the misoperation possibility, has saved the cost of labor of system's operation.
Claims (1)
1, a kind of city underground passenger information system of DVB digital television techniques of IP based network is made of control centre's subsystem, train station subsystem and transmission network; It is characterized in that:
Described control centre subsystem by digital video frequency server, broadcast Control work station, center webmaster/operator's server, central database server, network encoder, media materials gateway, look the audio frequency switching matrix, look audio frequency digital-to-analogue/analog to digital converter, digital television devices, outside source, center integration Management software, coffret constitute; Simultaneously, center subsystem also provides a plurality of and interface other system, be responsible for the whole system equipment working state is monitored and the centralized management of network system, also comprise the collection of external information stream, the editor who broadcasts format, video flowing conversion, broadcast the memory function of control, system monitoring, system information;
Outside source is by normal video, audio interface and look the audio frequency switching matrix and link to each other, and looks the audio frequency switching matrix and exports the accurate video-audio signal of a road sign to monitor, is used to monitor outside source; The standard analog video-audio signal of looking audio frequency switching matrix output after looking audio frequency digital-to-analogue/analog to digital converter and handling with the SDI interface to the digital video frequency server transmission of digital signals; Digital video frequency server with the SDI interface respectively to network encoder, media materials gateway, look audio frequency digital-to-analogue/analog to digital converter and send digital signal, network encoder links to each other with the RJ45 interface digital signal that receives with the media materials gateway with the transmission network switch, and sends IP network DVB digital video-audio signal to transmission network; The sdi signal that digital to analog converter sends digital video frequency server is handled the back and is shown on monitor with the standard analog video-audio signal; Broadcast the Control work station and send RS-422 interface control signal control figure video server by operation Broadcast Control program module; Center webmaster/operator's server links to each other with the transmission network switch with the RJ45 interface; Database server links to each other with the transmission network switch with the RJ45 interface;
Described train station subsystem by LED passenger's guide board, interface adapter, communication controller, power supply communication controller, control computer, passenger's information presentation controller, station broadcasting server, plasma display, look audio digital to analog converter and constitute; Train station subsystem is by the real time information of transmission channel broadcast from control centre, and the information of the our station that can superpose on its basis;
The station broadcasting server: link to each other with the transmission network switch with the RJ45 interface, receive and handle the real time information of playing from control centre, and the information of the our station that superposes on its basis; Passenger's information presentation controller links to each other with the transmission network switch with the RJ45 interface; Look audio digital to analog converter and receive the sdi signal that passenger's information presentation controller sends, handle the back and on LED passenger's guide board monitor and plasma display, show with the standard analog video-audio signal; On/descending LED display controller, receive the videography information that OCC transmits by the videography transmission network respectively, receive train running information respectively by three road interface adapters from the ATS system; On/descending LED display controller is the data message aggregation process, offers data sharing in PIS and the station local area network; Interface adapter: by the train running information of interface box reception in station from the ATS system, realize communicating by letter between master control borad and the controlled board, comprise all information of transmitting between master control borad and the controlled board, the train running information that reception is handled well is transferred to passenger's information presentation controller by communication port, and passenger's information presentation controller is transferred to PDP display screen, LED passenger's guide board and DTI after the train running information that receives is handled again; The power supply communication controller: is RS-232 level conversion in the power control signal RS-485 level; Timer (DTI) communication controller of dispatching a car: with RS-232 level conversion in the DTI control signal is the RS-485 level.
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| CNB2006100399623A CN100438611C (en) | 2006-04-27 | 2006-04-27 | City underground passenger information system of using DVB digital TV technique based on IP network |
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| CN100438611C true CN100438611C (en) | 2008-11-26 |
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| CN1874477A (en) | 2006-12-06 |
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