CN103618859A - DVI video signal distributor capable of meeting aeronautical environment application requirement - Google Patents
DVI video signal distributor capable of meeting aeronautical environment application requirement Download PDFInfo
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- CN103618859A CN103618859A CN201310628697.2A CN201310628697A CN103618859A CN 103618859 A CN103618859 A CN 103618859A CN 201310628697 A CN201310628697 A CN 201310628697A CN 103618859 A CN103618859 A CN 103618859A
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- dvi
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- decoder
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Abstract
The invention discloses a DVI video signal distributor capable of meeting an aeronautical environment application requirement. The DVI video signal distributor comprises a printed board, a decoder and at least two coders, wherein the decoder and the coders are welded to the printed board. According to the DVI video signal distributor, through daisy-chain-shaped wiring of output signals of the DVI decoder on the printed circuit and impedance control, a distribution module for expanding a DVI video signal to two or more video signals is obtained. By the adoption of the DVI video signal distributor, a small number of chips are used for completing expanding to two or more DVI signals, the number of elements on a circuit board is reduced, cost is obviously reduced, and the reliability is improved. The DVI video signal distributor capable of meeting the aeronautical environment application requirement is quite suitable for occasions having the aeronautical environment application requirement only for distribution, displaying and application of DVI videos and remarkable in market prospect and economic benefit.
Description
Technical field
The present invention relates to a kind of video distributor, particularly a kind of video distributor for airborne circumstance.
Background technology
DVI1.0 interface specification is that numeral shows a kind of industrial standard that working group (DDWG) defines for carrying out transfer of data between computer and display device.It provides a kind of high-speed figure connected mode for viewdata transmits, and not only extensive use in civilian consumer products, is also used in Airborne Video System transmission field in a large number.
Its technical characteristics is as follows:
1) adopt TDMS coding, the maximum pixel clock that single-link is supported is 165MHz;
2) compatible simulation VGA signal;
3) support EDID data and DDC passage;
4) plug and play.
In some application scenario, need to distribute demonstration to DVI signal, conventional method is by special distribution chip and FPGA.In avionic device, also adopted in a large number at present DVI standard, but for requirements such as aviation field reliability, fail safes, in DVI video distribution, can not adopt the DVI of civilian level to distribute integrated circuit, and complete by more expensive technical grade programming device (FPGA).In this technical spirit, be first at FPGA internal reproduction signal, more direct-connectedly to pin, carry out fan-out, feature is only to consume a small amount of logical resource, but takies a large amount of device pins.Result is the complexity that had both increased system, has reduced reliability, has caused again the waste of FPGA resource.
Summary of the invention
Goal of the invention of the present invention is to provide a kind of DVI video distributor that meets aeronautical environment application requirements, reduces the hardware and software complexity of system, reduces volume, power consumption, cost.
Goal of the invention of the present invention is achieved through the following technical solutions:
Meet a DVI video distributor for aeronautical environment application requirements, comprise printed board, be welded on a decoder and two above encoders in printed board, it is characterized in that:
Described decoder resolves into digital signal by DVI vision signal, comprises red component, green component, blue component, line synchronizing signal, field sync signal, pixel clock signal;
Described printed board adopts daisy chain form to connect up and carries out impedance Control, and the digital signal of decoder output is fanned out to encoder;
Described encoder converts digital signal to DVI signal and send display.
Preferably, be also welded with clock buffer on printed panel, the pixel clock signal of decoder output is connected on independent clock buffer, and the encoder that is extended to multipath clock signal and rear carries out point to point connect.
Preferably, described clock signal should approach with the capacitive load of feedback end on clock buffer and take that to guarantee to postpone minimum be even zero to the total length of each encoder cabling and the capacitive load size of the corresponding isometric ，Mei of data wire road Buffer output.
Compared with prior art, beneficial effect of the present invention is the expansion of having removed 2 roads or multichannel DVI signal by number of chips seldom, not only saved the quantity of components and parts on circuit board, significantly reduced cost, but also improved reliability, extremely be suitable for only need to DVI video, distributing the occasion of the aeronautical environment application requirements of display application, there is significant market prospects and economic benefit.
Accompanying drawing explanation
Fig. 1 is a kind of theory diagram that meets the DVI video distributor of aeronautical environment application requirements of the present invention
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
By in printed board, the output signal of DVI decoder being connected up by daisy chain form and carrying out impedance Control, realize the distribution module that 1 road DVI vision signal is extended to 2 roads or multichannel.
The theory diagram of system is illustrated in fig. 1 shown below.The DVI signal of input is introduced into decoder and converts digital signal to, comprise R[7:0] (red component), G[7:0] (green component), B[7:0] (blue component), Hsync(line synchronizing signal), Vsync(field sync signal), Pclk(pixel clock signal), then in printed board, by daisy chaining, be divided into two-way or multichannel and give coder transitions to become DVI signal to send aobvious.Consider when clock frequency very Gao Shi，Yin clock line branch and the impact that the reflection that produces brings to signal integrity, increase the fan-out that the clock buffer that possesses zero-lag function is used as clock signal.The pixel clock signal of decoder output is connected on independent clock buffer, the encoder that is extended to multipath clock signal and rear carries out point to point connect, clock signal should be isometric with corresponding data wire to the total length of every slice encode device cabling, and the capacitive load size of every road Buffer output should approach with the capacitive load of feedback end on clock buffer and take that to guarantee to postpone minimum be even zero.
Claims (3)
1. meet a DVI video distributor for aeronautical environment application requirements, comprise printed board, be welded on a decoder and two above encoders in printed board, it is characterized in that:
Described decoder resolves into digital signal by DVI vision signal, comprises red component, green component, blue component, line synchronizing signal, field sync signal, pixel clock signal;
Described printed board adopts daisy chain form to connect up and carries out impedance Control, and the digital signal of decoder output is fanned out to encoder;
Described encoder converts digital signal to DVI signal and send display.
2. DVI video distributor according to claim 1, it is characterized in that being also welded with on described printed panel clock buffer, the pixel clock signal of decoder output is connected on independent clock buffer, and the encoder that is extended to multipath clock signal and rear carries out point to point connect.
3. DVI video distributor according to claim 2, it is characterized in that described clock signal should approach with the capacitive load of feedback end on clock buffer and take that to guarantee to postpone minimum be even zero to the total length of each encoder cabling and the capacitive load size of the corresponding isometric ，Mei of data wire road Buffer output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628697.2A CN103618859A (en) | 2013-11-29 | 2013-11-29 | DVI video signal distributor capable of meeting aeronautical environment application requirement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628697.2A CN103618859A (en) | 2013-11-29 | 2013-11-29 | DVI video signal distributor capable of meeting aeronautical environment application requirement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103618859A true CN103618859A (en) | 2014-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310628697.2A Pending CN103618859A (en) | 2013-11-29 | 2013-11-29 | DVI video signal distributor capable of meeting aeronautical environment application requirement |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030142240A1 (en) * | 2002-01-29 | 2003-07-31 | Koninklijke Philips Electronics N.V. | Device and method for interfacing digital video processing devices |
| CN201611914U (en) * | 2010-01-06 | 2010-10-20 | 青岛海信电器股份有限公司 | VGA signal distributor circuit and television testing system |
| CN102332246A (en) * | 2011-09-28 | 2012-01-25 | 常州工学院 | Video graphics array (VGA) multi-channel distribution circuit and working method thereof |
| CN102497515A (en) * | 2011-12-07 | 2012-06-13 | 青岛艾孚高清技术有限公司 | SIMO (single-input multiple-output) type HDMI (high-definition multimedia interface) distributor device |
| CN102710899A (en) * | 2012-05-14 | 2012-10-03 | 安徽清大德人医疗科技股份有限公司 | Internal video distributor of medical case |
-
2013
- 2013-11-29 CN CN201310628697.2A patent/CN103618859A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030142240A1 (en) * | 2002-01-29 | 2003-07-31 | Koninklijke Philips Electronics N.V. | Device and method for interfacing digital video processing devices |
| CN201611914U (en) * | 2010-01-06 | 2010-10-20 | 青岛海信电器股份有限公司 | VGA signal distributor circuit and television testing system |
| CN102332246A (en) * | 2011-09-28 | 2012-01-25 | 常州工学院 | Video graphics array (VGA) multi-channel distribution circuit and working method thereof |
| CN102497515A (en) * | 2011-12-07 | 2012-06-13 | 青岛艾孚高清技术有限公司 | SIMO (single-input multiple-output) type HDMI (high-definition multimedia interface) distributor device |
| CN102710899A (en) * | 2012-05-14 | 2012-10-03 | 安徽清大德人医疗科技股份有限公司 | Internal video distributor of medical case |
Non-Patent Citations (2)
| Title |
|---|
| 冯瑞明: "HDMI分配器的设计与实现", 《世界电子元器件》, 15 June 2007 (2007-06-15), pages 47 - 50 * |
| 姜洪英: "基于DVI接口的LED视频显示系统的研究与设计", 《中国优秀博硕士学位论文全文数据库（硕士）信息科技辑》 * |
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Application publication date: 20140305 |