CN1581057A - Long-distance video pattern array signal transmission device - Google Patents
Long-distance video pattern array signal transmission device Download PDFInfo
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- CN1581057A CN1581057A CN 200410042720 CN200410042720A CN1581057A CN 1581057 A CN1581057 A CN 1581057A CN 200410042720 CN200410042720 CN 200410042720 CN 200410042720 A CN200410042720 A CN 200410042720A CN 1581057 A CN1581057 A CN 1581057A
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Abstract
The present invention relates to a long-distance VGA (video graphic array) signal transmission device of computer graphic transmission field. Said device mainly includes: line-field synchronous signal amplitude conversion circuit, single end-to-difference signal conversion and drive circuit and line-field synchronous signal superposition circuit, different-to-single end signal conversion circuit, RGB signal shaping superposition-removing circuit and line-field synchronous signal extraction circuit. Said device can make VGA signal be transmitted to 300 m. under the condition of ensuring signal quality, so that it has extensive application range.
Description
Technical field
The present invention relates to the computer graphical transmission technique field, particularly a kind of length is apart from Video Graphics Array (VGA) signal transmitting apparatus.
Background technology
In present computer system, usually that display card output is VGA (Video GraphicArray, Video Graphics Array) signal, the VGA signal comprises three class signals usually: the first kind is the video tricolor signal: RGB RGB (RGB:Red Green Blue, red green blue tricolor), the ceiling voltage amplitude of RGB is 0.7V; Second class is the video line field sync signal, and being respectively vertical synchronization is that field sync signal VSYNC and horizontal-drive signal are line synchronizing signal HSYNC; The 3rd class is I2C (I2CBus:Inter-ICBus, interconnection between an integrated circuit) bus signals, is respectively SCL and SDA.The VGA signal generally includes and uses shielded multiconductor cable as transmission line, and because the driving force of video tricolor signal and video line field sync signal is all more weak, so the transmission range of VGA signal generally has only several meters to tens meters, thereby limited the use-pattern of computing machine.
On the other hand, the making of shielded multiconductor cable is convenient inadequately, generally can only be customized by production firm, and price is also than higher.In addition, the connector size of shielded multiconductor cable is bigger, is not suitable for using in small-sized handheld device, thereby has also limited applying of VGA standard.
Summary of the invention
The object of the present invention is to provide a kind of length apart from the Video Graphics Array signal transmitting apparatus.The present invention proposes and a kind of the VGA signal is carried out differential driving and grows the device of Distance Transmission by 4 pairs of twisted-pair feeders, under the situation of not losing signal quality, can transmit 300 meters far away; On the other hand, the method that the present invention proposes is used 4 pairs of twisted-pair feeder transmission signals, (RJ45: a kind of socket standard of 8 pins) socket and crystal head have also been simplified the making of connecting line as interface unit when having reduced the line cost, have dwindled the volume of interface unit to adopt RJ45.
The present invention can be widely used in the field of computer technology and the relevant various application scenarios of VGA signal transmission, comprises the design, the design of large screen display wall VGA interface etc. of design, digital camera and video camera VGA interface of design, the projector VGA interface of design, the display VGA interface of display card VGA interface.
Description of drawings
Fig. 1, be length of the present invention apart from the circuit block diagram of VGA signal transmission.
Fig. 2, be video card and display VGA interface socket and signal definition synoptic diagram.
Fig. 3, be the capable field sync signal amplitude transformation circuit theory diagrams among Fig. 1.
Fig. 4, be single-ended-to-difference signal conversion circuit among Fig. 1 and driving and row field sync signal supercircuit schematic diagram.
Fig. 5, be five classes and surpass seven class unshielded cables and method of attachment figure.
Fig. 6, be the differential-to-single-ended signal conversion circuit schematic diagram among Fig. 1.
Fig. 7, be that the superposed signal circuit theory diagrams are removed in rgb signal shaping among Fig. 1.
Fig. 8, be that capable field sync signal among Fig. 1 is extracted circuit theory diagrams.
Embodiment
1. be the VGA output interface of video card, this output mainly comprises three class signals: the first kind is video tricolor signal RGB one RGB, and the ceiling voltage amplitude of RGB is 0.7V; Second class is the video line field sync signal, and being respectively vertical synchronization is that field sync signal VSYNC and horizontal-drive signal are line synchronizing signal HSYNC; The 3rd class is the I2C bus signals, is respectively SCL and SDA.The socket synoptic diagram of video card VGA interface and signal definition are as shown in Figure 2.
2. be row field sync signal amplitude transformation circuit, the major function of this part circuit is that positive pulse or the negative pulse that will import all are transformed into a positive pulse, (because the pulse of the synchronizing signal of the video card of different model output is inconsistent, the video card that has can be exported positive pulse, the meeting that has output negative pulse).It is input as the VSYNC and the HSYNC of 1. output, and its voltage magnitude is 1V, and it is output as VSYNC ' and HSYNC ' through conversion, and through after the conversion, the voltage magnitude of VSYNC ' and HSYNC ' is restricted to 230mV.
Row field sync signal amplitude transformation circuit theory is shown in figure three, and this part circuit mainly is made of two 74HCT86 XOR gate.For line synchronizing signal HSYNC, this input directly is sent to the pin one of XOR gate U1A, deliver to the pin two of XOR gate U1A after this signal is also postponed by the RC circuit filtering that is made of R1 and C1 simultaneously, when HSYNC sent a positive pulse or negative pulse here, XOR gate will be exported a positive short pulse.Export HSYNC ' to after the output process R2 of XOR gate U1A and the R3 dividing potential drop, the voltage magnitude of HSYNC ' is restricted to 230mV.Conversion process for field sync signal VSYNC is identical with the conversion process of line synchronizing signal HSYNC.
3. be single-ended-to-difference signal transformation and driving circuit and row field sync signal supercircuit, it is input as the VSYNC ' and the HSYNC ' of the RGB of 1. output and 2. output, and it is output as 3 pairs of differential signals that amplify through 2 multiplication benefits.
This part circuit theory is shown in figure four, and this circuit mainly is made up of three AD8131 high-speed-differential drivers.The video rgb signal links to each other with the positive input terminal IN+ of U1, U2, U3 respectively, U1 is used for red video signal RVGA is carried out differential transformation, owing to do not have other signals and RVGA signal to superpose, the negative input end IN-of U1 is by one 51 ohm resistance R 1 ground connection; U2 is used for video green signal GVGA is carried out conversion, and simultaneously the negative input end IN-of U2 links to each other with HSYNC ', soon line synchronizing signal and GVGA superposes and carry out differential transformation; In like manner, U3 is used for blue video signal BVGA is carried out conversion, and simultaneously the negative input end IN-of U2 links to each other with VSYNC ', soon field sync signal and BVGA superposes and carry out differential transformation.
When the VGA signal was exported, line synchronizing signal appeared between two line scannings, and when line synchronizing signal occurred, RGB output was 0; Field sync signal appears between two frames switchings, and when field sync signal occurred, RGB output was 0; So above-mentioned signal additive process can not exert an influence to rgb signal.Simultaneously, because row field signal is to link to each other with the negative input end IN-of differential driver, its output is negative signal, just can at an easy rate they be extracted at receiving end like this.
4. be the RJ45 socket, the RJ45 socket has 8 pins, connects 3 pairs of differential signals of above-mentioned 3. circuit output respectively, and its annexation is: 1,2 pins link to each other with above-mentioned 3. output R+, the R-of middle U1 respectively; 4,5 pins link to each other with above-mentioned 3. output G+, the G-of middle U2 respectively; 7,8 pins link to each other with above-mentioned 3. output B+, the B-of middle U3 respectively; Pair of pins 3,6 is used for connecting the I2C bus signals on the above-mentioned 1. video card in addition, is respectively SCL and SDA.
5. be and above-mentioned 4. identical RJ45 socket that its signal definition is also identical with RJ45 socket definition 4..
Can with the netting twine of a standard connect above-mentioned 4. and 5., in figure five detailed icon the definition of RJ45 connector socket stitch number, EIA/TIA 568B plugs and sockets signal definition, EIA/TIA568B straight through cable connection, five classes and surpass the cut-open view etc. of seven class unshielded cables, the connecting line of making according to afore mentioned rules can guarantee reliable and transmission signals effectively.
The bandwidth that surpasses 5 class unshielded twisted pairs (U5e) has only 100Mhz, is about 100 meters to the transmission of video signals distance; 6 class unshielded twisted pairs (Cat6 UTP (UTP:UnshieldedTwisted Paired, unshielded twisted pair)) bandwidth can reach 250MHz, and surpass 5 class lines and equally use RJ45 joint of the same race, so adopt 6 class unshielded twisted pairs the transmission range of signal can be extended to more than 200 meters.
Transfer signals to farther distance if desired, can also adopt Shielded Twisted Pair to carry out the transmission of signal.Shielded Twisted Pair mainly contains 6 type shielding twisted-pair feeders (Cat6 S/FTP) now, surpasses 6 type shielding twisted-pair feeders (Cat6 S/FTP), 7 type shielding twisted-pair feeders (Cat7 S/STP (STP:ShieldedTwisted Pair, and surpass 7 type shielding twisted-pair feeders or the like Shielded Twisted Pair)), they are by means of the braiding copper mesh screen layer of independent line to aluminum foil shielded and whole cable, can reach very excellent shield effectiveness, have very high-quality electric and mechanical property, can satisfy the most significant end demand.These twisted-pair feeders can reach the 600Mhz transmission bandwidth of 7 class line standard defineds basically, and the 7 type shielding twisted-pair feeder performances that many manufacturers such as Datwyler wiring system provide are up to 800-1200MHz.So adopt the high performance Shielded Twisted Pair of this class when ensuring signal quality, transmission range to be extended to more than 300 meters.
6. be differential-to-single-ended signal conversion circuit, it is input as the RJ45 socket and 5. exports three pairs of differential signals, it is output as ROUT, G and B through differential-to-single-ended signal transformation, through after the conversion, ROUT has reverted to the RVGA signal of video card VGA output, can be directly as the RVGA signal in the display VGA input.Also comprised stack capable field sync signal thereon among G and the B respectively, need do further processing again and just can be reduced into GVGA and the BVGA signal of display VGA in importing.
Single-ended signal translation circuit principle is shown in figure six, this part circuit differential receiver MAX4145 mainly high-speed by three, low distortion constitutes, be connected respectively to U1 differential input end IN-and IN+ by R-that 5. sends here and R+, the gain of U1 is simultaneously adjusted on pin RG-and the RG+ and has been connected resistance-capacitance circuit R2, RV1 and C5, the gain multiple is: 1+ (1.4k/RG), wherein, RG is the equivalent resistance of this resistance-capacitance circuit.Because the capacitance of C5 is 100pf, thus should equivalence resistance very big when the transmission low frequency signal, make that the gain multiple is 1 substantially, promptly when low frequency, signal is not amplified; But when transmitting high-frequency signal, this equivalence resistance is approximately R2+RV1, so this is to regulate the gain multiple by the value of adjusting RV1.
Since above-mentioned 4. and 5. transmission range longer, this section transmission line is bigger to the decay of high-frequency signal, so only realized the high frequency signals transmitted amplification that gains by above-mentioned resistance-capacitance circuit, and the purpose that the very little low frequency signal of decay is not amplified.
The resistance R 1 that the output terminal of U1 connects is 75 ohm, the impedance matching that is used to export.
Effect and the U1 of U2 and U3 are identical, and the decay in transmission compensates to the G-of input and the differential-to-single-ended signal transformation of G+, B-and B+ and to high-frequency signal to be respectively applied for realization.
7. be the rgb signal shaping circuit, fundamental purpose is to be used to remove the capable field sync signal that is superimposed upon on G and the B, it is input as the G and the B of 6. output, it is output as GOUT and BOUT, these two signals have reverted to the GVGA and the BVGA signal of video card VGA output, can be directly as GVGA and BVGA signal in the display VGA input.
Rgb signal shaping circuit principle is shown in figure seven, this part circuit mainly is made of the voltage limit amplifier OPA688 of two single gains, high bandwidth, by 6. sending the positive input terminal IN+ that G is connected to U1 here, the negative input end IN-of U1 is by resistance R 1 ground connection, low simultaneously pressure limiting input end VL ground connection, the input of high pressure limiting input end VH is about for 0.8V (this voltage is obtained by resistance R 4 and R5 dividing potential drop), so just constituted a broadband half-wave pressure limiting rectifier, make when G be input as negative value the time, the value of exporting GOUT is 0V; When G be input as between 0～0.8V the time, output GOUT value also be 0～0.8V; When the input of G during greater than 0.8V, the value of output GOUT is 0.8V.Like this, no matter why the input of G is worth, and the value of output GOUT always is limited between 0～0.8V.
Because HSYNC ' is superimposed upon among the G with negative level, so this circuit at first can be removed the horizontal-drive signal HSYNC ' that is superimposed upon among the input G, it can also guarantee that the output area of GOUT can only be between 0～0.8V simultaneously, can guarantee that like this this signal meets the voltage input standard of VGA display, can not cause damage to the input circuit of display.
Effect and the U1 of U2 are identical, the identical processing of also carrying out for B.
In 7., because do not superpose other signals in the ROUT signal of 6. sending here, so this signal need not conversion, can be directly by the input end of 7. delivering to 9..
8. extract circuit for the row field sync signal, fundamental purpose is the capable field sync signal that is used for extracting from G and B stack, it is input as the G and the B of 6. output, and it is output as HSYNC and VSYNC, and these two signals can be directly as HSYNC and VSYNC signal in the display VGA input.
The row field sync signal is extracted circuit theory shown in figure eight, and this part circuit mainly is made of a slice high speed, low-power consumption, voltage comparator MAX902, and MAX902 inside comprises two voltage comparators.By 6. sending the negative input end IN-1 that G is connected to U1 here, positive input terminal IN+1 meets one fixed voltage value-0.1V (this-0.1V by resistance R 2 and R3 dividing potential drop), and the end Latch1 that latchs of voltage comparator connects+5V, represents that this comparer is in the triggering state always.Foregoing circuit is represented a TTL high level will occur on its output terminal OUT1, otherwise OUT1 to be output as the TTL low level as long as one of input is lower than-voltage of 0.1V on IN+1.On being superimposed upon G-when the line synchronizing signal of 230mV occurs, this value is lower than-0.1V, a TTL high level will occur so OUT1 is last, this signal is exactly the HSYNC that needs in the display VGA input, has so just realized the line synchronizing signal HSYNC that is superimposed upon among the G is extracted.
Equally, utilize second voltage comparator among the MAX902 can realize extraction to field sync signal VSYNC.
9. be the VGA input socket of display, the rgb signal of this socket comes from output 7., the capable field sync signal of this socket comes from the HSYNC and the VSYNC signal of 8. output, its I2C signal directly comes from output 5., in fact, I2C signal SCL and SDA do not do any conversion in whole transmission course, can think that the VGA output by video card is directly connected to the VGA input of display.
The invention effect
This length is embodied in apart from the invention effect of VGA method for transmitting signals:
1) meets industrial standard.Measured VGA Interface design, (PC99: a kind of existing personal computer standard) standard is fit to most equipment such as display card, display and projector to meet PC99.
2) transmission range is long.Adopt common when surpassing 5 class unshielded twisted pairs (U5e) transmission range can reach 100 meters; Transmission range can reach 200 meters when adopting 6 class unshielded twisted pairs (Cat6UTP); If can be when adopting 7 type shielding twisted-pair feeders (Cat7S/STP) with the transmission distance
From extending to more than 300 meters.
3) signal quality is good.Because vision signal has been passed through differential transformation and has been transmitted, so guaranteed signal transfer quality, simultaneously owing to designed high frequency compensation at receiving end, even so high-frequency signal has certain decay also can be compensated thereby make to decay by adjusting the gain that variable resistor improves signal in transmission course.
4) the socket volume is little.Owing to adopted RJ45 socket and crystal head as interface unit, dwindled the volume of interface unit widely, usually the RJ45 socket has only 1/2nd sizes of standard VGA socket, and this provides convenience for some mini-plant such as handheld device etc. when increasing VGA output.
5) the line price is low.The common price that surpasses 5 class unshielded twisted pairs (U5e) is well below the VGA transmission line of standard, and when transmission range was longer, the advantage on this price can be more obvious.
6) support plug and play.Comprise the I2C bus signals SCL and the SDA of video card output in the transmission line, made things convenient for system to realize plug-and-play feature.
7) line is made simple.Transmission line can be made by domestic consumer oneself, and outfit only is that a routing clamps, thereby the length of line can arbitrarily be customized by the user.
Claims (6)
1. one kind long apart from the VGA signal transmitting apparatus, this device is by the VGA output interface of video card, row field sync signal amplitude transformation circuit, single-ended-to-difference signal transformation and driving circuit and row field sync signal supercircuit, the RJ45 socket, differential-to-single-ended signal conversion circuit, supercircuit is removed in the rgb signal shaping, the row field sync signal is extracted circuit, the VGA input socket of display is formed, it is characterized in that, the VGA output of video card is connected in capable field sync signal amplitude transformation circuit, this translation circuit is connected in single-ended-to-difference signal transformation and driving circuit and row field sync signal supercircuit, this conversion and driving circuit and supercircuit are connected in the RJ45 socket, this socket is by 4 pairs of twisted-pair feeders, the RJ45 socket is connected in differential-to-single-ended signal conversion circuit, this translation circuit is connected to the rgb signal shaping again and removes supercircuit and row field sync signal extraction circuit, exports display VGA input socket at last to.
According to the length of claim 1 apart from the VGA signal transmitting apparatus, it is characterized in that, row field sync signal amplitude transformation circuit, constitute by two 74HCT86 XOR gate, line synchronizing signal HSYNC, directly deliver to XOR gate, this signal is by RC circuit filtering that is made of R1 and C1 and delay, when HSYNC sends a positive pulse or negative pulse here, XOR gate will be exported a positive short pulse, export HSYNC ' to after the output process R2 of XOR gate and the R3 dividing potential drop, identical for the conversion process of field sync signal VSYNC with the conversion process of line synchronizing signal HSYNC.
According to the length of claim 1 apart from the VGA signal transmitting apparatus, it is characterized in that, single-ended-to-difference signal transformation and driving circuit and row field sync signal supercircuit are made up of three AD8131 high-speed-differential drivers, respectively red, green, blue video signal are carried out conversion.
According to the length of claim 1 apart from the VGA signal transmitting apparatus, it is characterized in that differential-to-single-ended signal conversion circuit is high-speed by three, the differential receiver MAX4145 of low distortion constitutes.
According to the length of claim 1 apart from the VGA signal transmitting apparatus, it is characterized in that the rgb signal shaping is removed supercircuit and is made of the voltage limit amplifier OPA688 of two single gains, high bandwidth.
According to the length of claim 1 apart from the VGA signal transmitting apparatus, it is characterized in that the row field sync signal is extracted circuit and is made of a slice high speed, low-power consumption, voltage comparator MAX902, MAX902 inside comprises two voltage comparators.
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| CN 200410042720 CN1275135C (en) | 2004-05-21 | 2004-05-21 | Long-distance video pattern array signal transmission device |
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| CN 200410042720 CN1275135C (en) | 2004-05-21 | 2004-05-21 | Long-distance video pattern array signal transmission device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075770A (en) * | 2011-01-05 | 2011-05-25 | 南京邮电大学 | Automatic color correction method and device for video graphics array (VGA) video extended signal |
| CN101630496B (en) * | 2009-03-13 | 2011-06-22 | 深圳市优特普科技有限公司 | Twisted-pair visual frequency or audio frequency signal transmission system with automatic regulation |
| CN101572073B (en) * | 2008-04-28 | 2012-03-14 | 北京竞业达数码科技有限公司 | System and method for video graphics array (VGA) signal transmission with long cable |
| US8253863B2 (en) | 2009-02-12 | 2012-08-28 | Mitsubishi Electric Corporation | Display unit for transmitting/receiving analog video transmitted via a long-distance transmission line |
| CN104113720A (en) * | 2014-07-29 | 2014-10-22 | 中国航空无线电电子研究所 | Multi-functional difference red-green-blue (RGB) video generating device |
| 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 |
| CN107147863A (en) * | 2017-06-08 | 2017-09-08 | 晶晨半导体(上海)股份有限公司 | It is a kind of to reduce the method that high-definition interface is disturbed wireless signal |
| CN109189095A (en) * | 2018-09-27 | 2019-01-11 | 东华理工大学 | A kind of miniature underwater robot video detection and control system |
| CN117560460A (en) * | 2024-01-12 | 2024-02-13 | 杭州海康威视数字技术股份有限公司 | Conversion circuit for video analog signal transmission |
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2004
- 2004-05-21 CN CN 200410042720 patent/CN1275135C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572073B (en) * | 2008-04-28 | 2012-03-14 | 北京竞业达数码科技有限公司 | System and method for video graphics array (VGA) signal transmission with long cable |
| US8253863B2 (en) | 2009-02-12 | 2012-08-28 | Mitsubishi Electric Corporation | Display unit for transmitting/receiving analog video transmitted via a long-distance transmission line |
| CN101630496B (en) * | 2009-03-13 | 2011-06-22 | 深圳市优特普科技有限公司 | Twisted-pair visual frequency or audio frequency signal transmission system with automatic regulation |
| CN102075770A (en) * | 2011-01-05 | 2011-05-25 | 南京邮电大学 | Automatic color correction method and device for video graphics array (VGA) video extended signal |
| CN104113720A (en) * | 2014-07-29 | 2014-10-22 | 中国航空无线电电子研究所 | Multi-functional difference red-green-blue (RGB) video generating device |
| CN104113720B (en) * | 2014-07-29 | 2017-03-22 | 中国航空无线电电子研究所 | Multi-functional difference red-green-blue (RGB) video generating device |
| 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 |
| CN107147863A (en) * | 2017-06-08 | 2017-09-08 | 晶晨半导体(上海)股份有限公司 | It is a kind of to reduce the method that high-definition interface is disturbed wireless signal |
| CN109189095A (en) * | 2018-09-27 | 2019-01-11 | 东华理工大学 | A kind of miniature underwater robot video detection and control system |
| CN117560460A (en) * | 2024-01-12 | 2024-02-13 | 杭州海康威视数字技术股份有限公司 | Conversion circuit for video analog signal transmission |
| CN117560460B (en) * | 2024-01-12 | 2024-04-09 | 杭州海康威视数字技术股份有限公司 | Conversion circuit for video analog signal transmission |
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Effective date of registration: 20191223 Address after: Room 801, building 6, Qilu Chuangzhi Park, 2600 Wenhua South Road, Kuiwen District, Weifang City, Shandong Province Patentee after: Weifang Zhongke Zhishi Information Technology Co., Ltd Address before: 100190 1044, room 10, research complex, 6 South Road, Haidian District Science Academy, Beijing. Patentee before: Beijing Kejiyin Technology Co. Ltd. |
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