CN105100643A - Video transmission and playing structure with multiple terminals and transmission method - Google Patents
Video transmission and playing structure with multiple terminals and transmission method Download PDFInfo
- Publication number
- CN105100643A CN105100643A CN201410382642.2A CN201410382642A CN105100643A CN 105100643 A CN105100643 A CN 105100643A CN 201410382642 A CN201410382642 A CN 201410382642A CN 105100643 A CN105100643 A CN 105100643A
- Authority
- CN
- China
- Prior art keywords
- terminal
- signal
- cascade module
- video
- passive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Picture Signal Circuits (AREA)
Abstract
The invention provides a video transmission and playing structure with multiple terminals and a transmission method. The video transmission and playing structure includes a difference Video Graphics Array (VGA) distributor and terminals. A single path of video signals is output at an output end of the difference VGA. Each terminal is correspondingly provided with a passive cascade module, and the passive cascade module has a signal input end and a signal output end. The difference VGA distributor and the passive cascade modules are mutually cascaded. The signal output end of the last passive cascade module is connected with impedance matching. Through the invention, an internal structure of the difference VGA distributor is simplified. With the simplification of a plurality of assemblies, the production cost of the difference VGA distributor is reduced. By using the video transmission and playing structure with the multiple terminals and the transmission method, a wiring method in which each terminal corresponds to an individual cable in the prior art is changed. The cascade mode is employed for all the terminals. The use of the cables is reduced, and the cost is saved. Meanwhile the occupancy rate of the installation space is reduced, and the influence of narrow space no longer exists.
Description
Technical field
The present invention relates to the technical field of video playback, is a kind of transmission of video of the multiple terminals adopting one-channel signal to transmit and play structure and monitoring method specifically.
Background technology
Nowadays, the transmission of video of multiple terminals and the framework of broadcasting are widely used in the field of the track traffic such as subway, railway, and the requirement of the video playback of multiple terminals is that the display effect of each terminal is consistent, should not occur the situation of the asynchronous or distortion of picture.
In the transmission of video of multiple terminals and play structure, generally include: difference VGA distributor, incoming video signal, and transfer VGA signal to differential signal and export; Terminal, is connected with difference VGA distributor, receives differential signal and carries out video playback.In prior art when carrying out the transmission of video of multiple terminals and playing, adopt the transmission architecture shown in Fig. 1, difference VGA distributor is arranged multiple signals output, by difference VGA dispenser output end output multi-channel differential signal, the terminal of each displaying video is all connected with the output on difference VGA distributor with differential buffer device by cable, by differential buffer device, differential signal is converted to VGA signal, again by terminal 1, terminal 2 carries out video broadcast until terminal n receives each road VGA signal, the video distribution device of " more than one point " is set in difference VGA distributor simultaneously and VGA analog signal is carried out the video process apparatus of differential conversion and transmission, therefore, device in difference VGA distributor is comparatively complicated, under the prerequisite ensureing integrated level, cause cost higher.In addition, in the compartment of track traffic, reserved installing space is usually less, and it is also the work of a comparatively difficulty that many cables connecting difference VGA distributor and each terminal are arranged in compartment simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of transmission of video of the multiple terminals adopting one-channel signal to transmit and play structure and monitoring method.
The technical scheme that the present invention takes for the technical problem existed in solution known technology is:
The transmission of video of multiple terminals of the present invention and play structure, comprising: difference VGA distributor, incoming video signal, and transfer VGA signal to differential signal and export; Terminal, be connected with difference VGA distributor, receive differential signal and carry out video playback, the output of above-mentioned difference VGA distributor is that single channel vision signal exports, in each terminal, correspondence is provided with passive cascade module, and passive cascade module has signal input part and signal output part, the vision signal received is sent to counterpart terminal by passive cascade module; The output of difference VGA distributor is connected with the signal input part of the passive cascade module of first terminal, and the signal output part of the passive cascade module of first terminal is connected with the input of the passive cascade module of second terminal, the signal output part of the passive cascade module of second terminal is connected with the input of the passive cascade module of the 3rd terminal, by that analogy, until the signal output part of the passive cascade module of last terminal connects impedance matching.
The present invention can also adopt following technical measures:
Between described difference VGA distributor and passive cascade module, and passive cascade module is all connected by twisted-pair feeder each other.
Described terminal is provided with differential buffer device, differential buffer device is connected between passive cascade module and terminal, and the differential signal of input is converted to VGA signal again.
The impedance matching be connected with last passive cascade module is resistor.
Described first synchronously plays to the vision signal in last terminal.
The video transmission method of multiple terminals of the present invention, comprises the following steps:
The VGA vision signal recompile that transmission comes by A, difference VGA distributor is differential signal;
B, differential signal pass through the signal input part of single output through the passive cascade module of Double-strand transmission to the first terminal of difference VGA distributor;
C, enter the differential signal of first passive cascade module riches all the way and deliver to differential buffer device, again decoded by differential buffer device, generate VGA vision signal and be also sent to first terminal, shown by terminal; The signal output part of passive cascade module of first terminal of separately leading up to of differential signal transfers to the signal input part of the passive cascade module of second terminal;
D, second identical with step C with broadcasting to the process of last terminal to differential signal;
E, first synchronously plays to the vision signal in last terminal.
The advantage that the present invention has and good effect are:
The transmission of video of multiple terminals of the present invention and play structure, propose a kind of new transmission of video and play framework, when the environment for use play for multiple terminals, the video distribution module of multichannel is no longer set in difference VGA distributor and distributes with multi-channel video the multiple outputs matched, and the output of single channel is only set, also no longer multichannel distribution is carried out to vision signal simultaneously, thus the internal structure of difference VGA distributor is simplified, along with the simplification of above-mentioned multiple assembly, reduce the production cost of difference VGA distributor.Adopt the transmission of video of multiple terminals of the present invention and play structure and transmission method, change the wiring method of the corresponding independent cable of each terminal in prior art, all terminals have employed the mode of cascade, decrease the use of cable, save cost, the occupancy of installing space reduces simultaneously, no longer by the impact of narrow space.
Accompanying drawing explanation
Fig. 1 is the transmission of video of multiple terminals and the schematic diagram of play structure in prior art;
Fig. 2 is the transmission of video of multiple terminals of the present invention and the schematic diagram of play structure;
Fig. 3 is the schematic diagram of terminal and passive cascade module in the transmission of video of multiple terminals of the present invention and play structure;
Fig. 4 is the circuit diagram of passive cascade module in the transmission of video of multiple terminals of the present invention and play structure.
Embodiment
Referring to drawings and Examples, the present invention will be described in detail.
Fig. 2 is the transmission of video of multiple terminals of the present invention and the structural representation of play structure; Fig. 3 is the schematic diagram of terminal and passive cascade module in the transmission of video of multiple terminals of the present invention and play structure; Fig. 4 is the circuit diagram of passive cascade module in the transmission of video of multiple terminals of the present invention and play structure.
As shown in Figures 2 to 4, the transmission of video of multiple terminals of the present invention and play structure, comprising: difference VGA distributor, incoming video signal, and transfer VGA signal to differential signal and export; Terminal, be connected with difference VGA distributor, receive differential signal and carry out video playback, the output of above-mentioned difference VGA distributor is that single channel vision signal exports, in each terminal, correspondence is provided with passive cascade module, and passive cascade module has signal input part and signal output part, the vision signal received is sent to counterpart terminal by passive cascade module; The output of difference VGA distributor is connected with the signal input part of the passive cascade module of the terminal 1 in first terminal and figure, and the signal output part of the passive cascade module of first terminal is connected with the input of the passive cascade module of the terminal 2 in second terminal and figure, the signal output part of the passive cascade module of second terminal is connected with the input of the passive cascade module of the 3rd terminal, by that analogy, until the signal output part of the passive cascade module of last terminal and terminal n connects impedance matching.
Between difference VGA distributor and passive cascade module, and passive cascade module is all connected by twisted-pair feeder each other.Twisted-pair feeder is adopted to be output device and the receiving system that the VGA video transmission technologies of transmission medium needs simultaneously signalization, difference VGA distributor is the output of signal, VGA vision signal recompile is converted to differential signal, and differential signal is outwards transmitted.
Terminal is provided with differential buffer device, differential buffer device is the signal receiving device matched with difference VGA distributor, differential buffer device is connected between passive cascade module and terminal, the differential signal of input is converted to VGA signal again, again by VGA Signal transmissions to terminal, show for terminal.
The impedance matching be connected with last passive cascade module is resistor.Owing to adopting the mode of signal cascade, so the load impedance in video signal transmission process and the internal impedance in signal source or do not mate between transmission line, so need to arrange impedance matching at the least significant end of Signal transmissions to meet matching relationship to make the impedance in whole framework, the not equal relevant parameter of design parameter that is different according to the terminal quantity accessed in structure, cable, the resistance of variable resistance can be changed, thus reach the coupling of overall impedance.When in framework, relevant parameter remains fixing, impedance matching also can adopt the corresponding resistance of fixed resistance value.Impedance matching can be drawn by the relational expression Extrapolation of reflection coefficient, and reflection coefficient can show the relational expression into load impedance and sending-end impedance:
Can draw in the relational expression of above-mentioned reflection coefficient, when load impedance is identical with the numerical value of sending-end impedance, emission ratio is zero, and namely reflected signal is zero on the impact that video shows.In transmission of video structure of the present invention, load impedance is the impedance matching of terminal end series connection, and sending-end impedance is video signal transmission wire itself and carries impedance.
When load impedance in framework and the internal impedance in signal source or transmission line match, the reflection interference of signal is zero, and the display situation of each terminal is identical.Namely the size of impedance matching and the impedance magnitude of video signal transmission wire consistent time, make first synchronously to play to the vision signal in last terminal.
The video transmission method of multiple terminals of the present invention, comprises the following steps:
The VGA vision signal recompile that transmission comes by A, difference VGA distributor is differential signal;
B, differential signal pass through the signal input part of single output through the passive cascade module of Double-strand transmission to the first terminal of difference VGA distributor;
C, enter the differential signal of first passive cascade module riches all the way and deliver to differential buffer device, again decoded by differential buffer device, generate VGA vision signal and be also sent to first terminal, and shown by terminal; The signal output part of passive cascade module of first terminal of separately leading up to of differential signal transfers to the signal input part of the passive cascade module of second terminal;
D, second identical with step C with broadcasting to the process of last terminal to differential signal;
E, first synchronously plays to the vision signal in last terminal.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention with preferred embodiment openly as above, but, and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, certainly the technology contents of announcement can be utilized to make a little change or modification, become the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all belong in the scope of technical solution of the present invention.
Claims (6)
1. the transmission of video of multiple terminals and a play structure, comprising: difference VGA distributor, incoming video signal, and transfer VGA signal to differential signal and export; Terminal, be connected with difference VGA distributor, receive differential signal and carry out video playback, it is characterized in that: the output of above-mentioned difference VGA distributor is that single channel vision signal exports, in each terminal, correspondence is provided with passive cascade module, and passive cascade module has signal input part and signal output part, the vision signal received is sent to counterpart terminal by passive cascade module; The output of difference VGA distributor is connected with the signal input part of the passive cascade module of first terminal, and the signal output part of the passive cascade module of first terminal is connected with the input of the passive cascade module of second terminal, the signal output part of the passive cascade module of second terminal is connected with the input of the passive cascade module of the 3rd terminal, by that analogy, until the signal output part of the passive cascade module of last terminal connects impedance matching.
2. the transmission of video of multiple terminals according to claim 1 and play structure, it is characterized in that: between difference VGA distributor and passive cascade module, and passive cascade module is all connected by twisted-pair feeder each other.
3. the transmission of video of multiple terminals according to claim 2 and play structure, it is characterized in that: terminal is provided with differential buffer device, differential buffer device is connected between passive cascade module and terminal, and the differential signal of input is converted to VGA signal again.
4. the transmission of video of multiple terminals according to claim 1 and play structure, is characterized in that: the impedance matching be connected with last passive cascade module is resistor.
5. the transmission of video of multiple terminals according to claim 4 and play structure, is characterized in that: first synchronously plays to the vision signal in last terminal.
6. a video transmission method for multiple terminals, comprises the following steps:
The VGA vision signal recompile that transmission comes by A, difference VGA distributor is differential signal;
B, differential signal pass through the signal input part of single output through the passive cascade module of Double-strand transmission to the first terminal of difference VGA distributor;
C, enter the differential signal of first passive cascade module riches all the way and deliver to differential buffer device, again decoded by differential buffer device, generate VGA vision signal and be also sent to first terminal, shown by terminal; The signal output part of passive cascade module of first terminal of separately leading up to of differential signal transfers to the signal input part of the passive cascade module of second terminal;
D, second identical with step C with broadcasting to the process of last terminal to differential signal;
E, first synchronously plays to the vision signal in last terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410382642.2A CN105100643A (en) | 2014-08-06 | 2014-08-06 | Video transmission and playing structure with multiple terminals and transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410382642.2A CN105100643A (en) | 2014-08-06 | 2014-08-06 | Video transmission and playing structure with multiple terminals and transmission method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105100643A true CN105100643A (en) | 2015-11-25 |
Family
ID=54580081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410382642.2A Pending CN105100643A (en) | 2014-08-06 | 2014-08-06 | Video transmission and playing structure with multiple terminals and transmission method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105100643A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071304A (en) * | 2017-03-29 | 2017-08-18 | 北京正龙科技有限公司 | One kind use surpasses 5 class netting twines and realizes VGA signals and multiplexing and distributor and method |
| CN107566687A (en) * | 2017-10-16 | 2018-01-09 | 北京星网船电科技有限公司 | A kind of high performance gains ring goes out the image control mold |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2904508Y (en) * | 2006-01-10 | 2007-05-23 | 神州亿品科技有限公司 | Video signal multi-stage connector |
| CN201429944Y (en) * | 2009-06-19 | 2010-03-24 | 沈阳火炬北泰数码科技有限责任公司 | Display for railway vehicles |
| CN202049742U (en) * | 2011-05-13 | 2011-11-23 | 广州国联通信有限公司 | Vehicle-mounted medium play system |
| CN103390396A (en) * | 2013-06-28 | 2013-11-13 | 京东方科技集团股份有限公司 | Multi-terminal synchronous display method and device and display device cascading system |
-
2014
- 2014-08-06 CN CN201410382642.2A patent/CN105100643A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2904508Y (en) * | 2006-01-10 | 2007-05-23 | 神州亿品科技有限公司 | Video signal multi-stage connector |
| CN201429944Y (en) * | 2009-06-19 | 2010-03-24 | 沈阳火炬北泰数码科技有限责任公司 | Display for railway vehicles |
| CN202049742U (en) * | 2011-05-13 | 2011-11-23 | 广州国联通信有限公司 | Vehicle-mounted medium play system |
| CN103390396A (en) * | 2013-06-28 | 2013-11-13 | 京东方科技集团股份有限公司 | Multi-terminal synchronous display method and device and display device cascading system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071304A (en) * | 2017-03-29 | 2017-08-18 | 北京正龙科技有限公司 | One kind use surpasses 5 class netting twines and realizes VGA signals and multiplexing and distributor and method |
| CN107566687A (en) * | 2017-10-16 | 2018-01-09 | 北京星网船电科技有限公司 | A kind of high performance gains ring goes out the image control mold |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10374644B2 (en) | Broadband radio frequency data communication system using twisted pair wiring | |
| US20160165149A1 (en) | Daisy Chain Devices and Systems for Signal Switching and Distribution | |
| US8502073B2 (en) | Low impedance boosted high speed data cable | |
| US20020049879A1 (en) | Cable and connection with integrated DVI and IEEE 1394 capabilities | |
| US8502070B2 (en) | Reduced wire count high speed data cable | |
| US8108576B2 (en) | Dongle module, console module, matrix KVM switch system, local-end module, remote-end module, and extender system | |
| US20090251602A1 (en) | System and Method for Providing Video and Audio Signals to Multiple Displays | |
| CN201726404U (en) | KVM optical transmitter and receiver. | |
| CN112261334B (en) | Transmission method and system supporting HDMI2.1 signal single-channel input and multi-channel output | |
| CN202488591U (en) | High definition multimedia interface remote transmitting device | |
| US20100232484A1 (en) | Bidirectional digital communication circuit and a bidirectional digital communication method | |
| CN104363433B (en) | A kind of multichannel optical transmitter and receiver without external distributor | |
| CN202840186U (en) | High-definition multimedia interface (HDMI) extension rod of baseband signal amplification | |
| CN105100643A (en) | Video transmission and playing structure with multiple terminals and transmission method | |
| CN209710215U (en) | Sending card with TV functions | |
| US20080231578A1 (en) | LVDS display system | |
| CN103118233A (en) | High-definition audio and video mixing cascade digital transmission switcher | |
| CN203632783U (en) | Multipath long-distance VGA signal differential transmitting device and receiving device | |
| CN210781062U (en) | HDMI differential signal receiving converter based on rail transit | |
| CN210958555U (en) | HDMI twisted-pair IP extender | |
| CN104902194A (en) | Video/audio signal channel switching device | |
| CN102857754B (en) | Signal transmission device and transmitter and receiver thereof | |
| CN210112162U (en) | Video processing module capable of realizing multi-channel video signal output and acquisition | |
| US9910805B2 (en) | Patch panel and distribution amplifier with configurable input/output module | |
| CN202872962U (en) | Video-audio signal transmission system and transmission device thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151125 |
|
| RJ01 | Rejection of invention patent application after publication |