CN107071232A - VGA vision signal branch systems - Google Patents
VGA vision signal branch systems Download PDFInfo
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- CN107071232A CN107071232A CN201710315761.XA CN201710315761A CN107071232A CN 107071232 A CN107071232 A CN 107071232A CN 201710315761 A CN201710315761 A CN 201710315761A CN 107071232 A CN107071232 A CN 107071232A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
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Abstract
The present invention provides a kind of VGA vision signals branch system.The VGA vision signal branch systems of the present invention include：Control unit, VGA video input interfaces, row field synchronization processing unit, RGB gain branch output units in the same direction, HS/VS driving branches output unit, multiple VGA video output interfaces；By elements such as conventional comparator, triple gates, pure simulation VGA vision signal branch systems are realized, product stability and reliability are high；Secondly, level compares and the synchronous uniformity for belonging to symmetric design, improving multigroup signal.Circuit complexity in the prior art is solved, it is necessary to use multistage conversion chip, it is with high costs；, there is the risk for losing video effective information in two times transfer and branch between analog signal and data signal；Vision signal passes through multiple chips, easily there is the nonsynchronous problem of multi-channel video.
Description
Technical field
The present invention relates to video processing technique, more particularly to a kind of VGA vision signals branch system, belong to electronic technology neck
Domain.
Background technology
With continuing to develop for video display technology, in a variety of fields such as data center's control, information distribution, meeting room demonstrations
Close, it is necessary to be applied to one point of multi-channel video Display Technique.
And digital video Multiple-shower technology, due to the characteristic (data signal strong antijamming capability) of itself, determine
Digital video signal progress branch is relatively easy, and image quality and the reduction of color information degree and synchronous effect will after branch
Better than analog video signal, and there are signal buffering, amplifying power.And the branch of the analog video signal such as VGA is just complex,
And general VGA vision signal bypass technologies, easily there is distortion, missing color information, asynchronous etc. after signal branch
Some row problems, but how VGA vision signals are avoiding above-mentioned ask as a kind of current very important video display technology
High-quality signal branch is carried out in the case of topic, just becomes the important topic of current MultiMedia Field.
A kind of existing VGA vision signals branch system is as shown in figure 1, the set system is first to change VGA vision signals
Into data signal, the data signal after conversion is then subjected to branch process, multiple digital video signals are separated, then again by number
Word vision signal converts back VGA vision signals.
However, existing VGA vision signals branch system have the shortcomings that it is following：Circuit is complicated, it is necessary to use multistage turn
Chip is changed, it is with high costs；, there is the wind for losing video effective information in two times transfer and branch between analog signal and data signal
Danger；Vision signal passes through multiple chips, easily there is the nonsynchronous problem of multi-channel video.
The content of the invention
It is an object of the present invention to it is complicated for foregoing circuit, it is with high costs using multistage conversion chip；Analog signal
, there is the risk for losing video effective information in two times transfer and branch between data signal；Vision signal passes through multiple chips,
Easily there is the nonsynchronous problem of multi-channel video；A kind of VGA vision signals branch system is proposed, by using common comparison
The elements such as device, triple gate, technology maturation, product stability and reliability are high；Level compares and synchronous symmetric design, to realize
Improve multigroup signal conformance.
To achieve the above object, a kind of VGA vision signals branch system of the present invention, including：Control unit, in fact
Now to the control of VGA vision signal branch systems；VGA video input interfaces, it is used for receiving believes from outside VGA videos
Number；Row field synchronization processing unit, it is used to adjust the amplitude of oscillation of the row field signal in the VGA vision signals of input, eliminates slow
Cyclical signal edge, synchronously compares output, row field signal branch first, and RGB_VS, RGB_HS signal output to HS/VS are driven
Dynamic branch output unit, by VS_y, HS_y signal output to control unit；RGB gain branch output units in the same direction, it will input
VGA vision signals in rgb signal be amplified, branch is exported to VGA video output interfaces；HS/VS driving branch outputs
Unit, RGB_VS, RGB_HS signal are done branch driving, and export to VGA by it according to the state of the control signal of control unit
Video output interface；VGA video output interfaces are multiple, and it will drive from RGB gain branch output units in the same direction and HS/VS
The signal output of branch output unit is to external equipment.
Further, according to above-mentioned VGA vision signal branch systems, wherein, row field synchronization processing unit includes double electricity
Comparator is pressed, the twin voltage comparator is used to HSIN and VSIN and NET_HV being compared, and does the of signal amplitude and synchronization
Once adjust.
Further, according to above-mentioned VGA vision signal branch systems, wherein, row field synchronization processing unit includes applying close
Special phase inverter, the schmitt inverter is changed into the precipitous rectangular pulse letter in edge for edge to be changed into slow cyclical signal
Number.
Further, according to above-mentioned VGA vision signal branch systems, wherein, row field synchronization processing unit includes rail pair
Rail operational amplifier, the output voltage of the track to track operational amplifier or the amplitude of oscillation of signal and supply voltage are basically identical.
Further, according to above-mentioned VGA vision signal branch systems, wherein, RGB gain branch output units in the same direction can
Gain in the same direction is realized, and R, G, B tristimulus signal are subjected to branch process.
Further, according to above-mentioned VGA vision signal branch systems, wherein, RGB gain branch output unit bags in the same direction
Single supply operational amplifier is included, the single supply operational amplifier can expire width output, and with prohibiting function.
Further, according to above-mentioned VGA vision signal branch systems, wherein, the times magnification of single supply operational amplifier
Number is 2 times.
Further, according to above-mentioned VGA vision signal branch systems, wherein, HS/VS driving branch output units include
The digit buffer of tri-state 8.
Further, according to above-mentioned VGA vision signal branch systems, wherein, the digit buffer of tri-state 8 is according to control unit
Control signal state, the address code in bus is kept in.
Further, according to above-mentioned VGA vision signal branch systems, wherein, the G terminal grounds of the digit buffer of tri-state 8,
The level of output end changes with the level of input, realizes synchronous.
Further, according to above-mentioned VGA vision signal branch systems, wherein, the VGA videos branch system can be encapsulated as
IC integrated circuits.
By above-mentioned VGA vision signal branch systems, using elements such as common comparator, triple gates, its technology into
Ripe, product stability and reliability are high；Secondly, level compares and synchronously belongs to symmetric design, can improve the one of multigroup signal
Cause property.In addition, the VGA vision signal branch systems use purely analog bypass technology, it is ensured that signal quality, no mistake
Very, lossless, the vision signal and interface after branch are relatively independent, can read the EDID information of display.
Brief description of the drawings
Fig. 1 is the schematic diagram of VGA vision signals branch system in the prior art；
Fig. 2 is the schematic diagram of VGA vision signal branch systems involved in the present invention；
Fig. 3 is the circuit diagram of row field synchronization processing unit；
Fig. 4 is the circuit diagram of RGB gain branch output units in the same direction；
Fig. 5 is the circuit diagram that HS/VS drives branch output unit.
Embodiment
The present invention is further described with reference to embodiments：
Embodiment 1
VGA vision signal branch systems involved in the present invention include：Control unit, VGA video input interfaces, row field are same
Walk processing unit, RGB gain branch output units in the same direction, HS/VS driving branches output unit, VGA video output interfaces.As schemed
Shown in 2, VGA video input interfaces are used to receive from outside VGA vision signals；Row field synchronization processing unit is used to adjust defeated
The amplitude of oscillation of row field signal in the VGA vision signals entered, eliminates slow cyclical signal edge, synchronously compares output, to row
Field signal carries out branch first, then, and RGB_VS, RGB_HS signal (HS2/VS2) output is single to HS/VS driving branch outputs
Member, by VS_y, HS_y signal (HS1/VS1) output to described control unit；RGB gain branch output units in the same direction will be from VGA
Rgb signal in the VGA vision signals that video input interface is obtained carries out the rgb signal difference after operation amplifier, branch, branch
Output exports 1 and VGA to VGA and exports 2；HS/VS drives branch output unit according to the shape of control unit MCU control signal
State, be by HS2/VS2：RGB_VS, RGB_HS signal do branch driving, and export to VGA 1 and VGA of output outputs 2；Control is single
The state of first MCU control signal be origin voluntarily field synchronization processing unit HS1/VS1 i.e.：VS_y, HS_y signal deciding；
VGA exports the VGA video output interfaces that 1 and VGA outputs 2 constitute whole system, and VGA video output interfaces can also be as needed
It is set to two or more, such as 3 or more.
More than, with reference to VGA vision signal branch systems involved in the present invention schematic diagram to the present invention operation principle
Provide a brief description, by the explanation of above-described embodiment, a conclusion can be done to the technique effect of the present invention：By above-mentioned
VGA vision signal branch systems, using elements such as common comparator, triple gates, its technology maturation, product stability and reliable
Property it is high；Secondly, level compares and synchronously belongs to symmetric design, can improve the uniformity of multigroup signal.In addition, the VGA videos
Signal branch system uses purely analog bypass technology, it is ensured that signal quality, undistorted, lossless, after branch
Vision signal and interface are relatively independent, can read the EDID information of display.
Hereinafter, embodiments of the present invention are described in detail with reference to the circuit diagram of each several part.
Fig. 3 is the circuit diagram of the row field synchronization processing unit of VGA vision signal branch systems involved in the present invention, is such as schemed
Shown in 3, the circuit part of the row field synchronization processing unit mainly includes：Twin voltage comparator LM393DR, schmitt inverter
74LVC1G14 and track to track operational amplifier LMV7219.
Twin voltage comparator LM393DR effect is to be compared HSIN and VSIN and NET_HV, do signal amplitude and
Synchronous first time adjustment；Schmitt inverter 74LVC1G14 is changed into edge for edge to be changed into slow cyclical signal
Precipitous rectangular pulse signal；The characteristics of track to track operational amplifier LMV7219, is that its end edge occupancy voltage is very low, increase
The dynamic range of system, so that the amplitude of oscillation of its output voltage or signal and supply voltage VCC are basically identical.
It is respectively that RGB_VS, RGB_HS signal after branch is defeated by the processing of the row field synchronization processing unit shown in Fig. 3
Go out to next stage process circuit (HS/VS driving branches output circuit)；VS_y, HS_y signal output are to control unit MCU.
Fig. 4 is the circuit of the RGB gain branch output units in the same direction of VGA vision signal branch systems involved in the present invention
Figure, as shown in figure 4, RGB gain branch output units in the same direction are mainly made up of single supply operational amplifier MAX4382.Single electricity
Source operational amplifier MAX4382 can rail-to-rail output, and with prohibiting function.The circuit is gain in the same direction, and its output end is equal to
2 times of input.
By the RGB gain branch output units in the same direction shown in Fig. 4, by the color of R, G, B tri- from VGA video input interfaces
Signal carries out R, G, B tristimulus signal point after branch process, branch process to R, G, B tristimulus signal after gain in the same direction is carried out
Do not export to VGA video output interfaces.
Fig. 5 drives the circuit of branch output unit for the HS/VS of VGA vision signal branch systems involved in the present invention
Figure, as shown in figure 5, HS/VS driving branch output units mainly include the digit buffer 74LS244 of tri-state 8.The digit buffer of tri-state 8
74LS244 does RGB_HS, RGB_VS bus branch driving, and the chip does not have latch function, according to the state of control signal, will
Address code in bus is kept in.Wherein G ends are grounded, and are low level, then tri-state gate output terminal Y level is with input A
The level change at end, accomplishes synchronization.
Branch output unit is driven by the HS/VS shown in Fig. 5, voluntarily the row field signal of field synchronization processing unit enters in the future
Row field signal after row branch process, branch process is exported to VGA video output interfaces respectively.
The VGA vision signals branch system being related in each above-mentioned embodiment can be encapsulated as IC integrated circuits, so that
It can be improved as the application of commodity, and can be assembled easily into equipment.It is also convenient for storing in a warehouse and transports simultaneously.
The explanation to embodiment more than, the present invention is complicated for circuit of the prior art, uses many level conversions
Chip, it is with high costs；, there is the wind for losing video effective information in two times transfer and branch between analog signal and data signal
Danger；Vision signal passes through multiple chips, easily there is a series of problems, such as multi-channel video is asynchronous；Propose a kind of VGA videos letter
Number branch system, by using the elements such as common comparator, triple gate, technology maturation, product stability and reliability are high；Electricity
It is flat to compare and synchronous symmetric design, improve multigroup signal conformance to realize.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (11)
1. a kind of VGA vision signals branch system, it is characterised in that including：
Control unit, it realizes the control to VGA vision signal branch systems；
VGA video input interfaces, it is used for receiving from outside VGA vision signals；
Row field synchronization processing unit, it is used to adjust the amplitude of oscillation of the row field signal in the VGA vision signals of input, eliminates slow
Cyclical signal edge, synchronously compares output, row field signal branch first, and RGB_VS, RGB_HS signal output to HS/VS are driven
Dynamic branch output unit, by VS_y, HS_y signal output to described control unit；
Rgb signal in RGB gain branch output units in the same direction, its VGA vision signal by input is amplified, branch output
To VGA video output interfaces；
The HS/VS drives branch output unit, its according to the state of the control signal of described control unit, by RGB_VS,
RGB_HS signals do branch driving, and export to VGA video output interfaces；
The VGA video output interfaces are two or more, and it will come from RGB gain branch output units in the same direction and described
The signal output of HS/VS driving branch output units is to external equipment.
2. VGA vision signals branch system according to claim 1, it is characterised in that the row field synchronization processing unit
Including twin voltage comparator, the twin voltage comparator is used to HSIN and VSIN and NET_HV being compared, and does signal amplitude
Adjusted with synchronous first time.
3. VGA vision signals branch system according to claim 1, it is characterised in that the row field synchronization processing unit
Including schmitt inverter, the schmitt inverter is used to edge changing slow cyclical signal that to be changed into edge precipitous
Rectangular pulse signal.
4. VGA vision signals branch system according to claim 1, it is characterised in that the row field synchronization processing unit
Including track to track operational amplifier, the output voltage of the track to track operational amplifier or the amplitude of oscillation of signal and supply voltage are basic
Unanimously.
5. VGA vision signals branch system according to claim 1, it is characterised in that the RGB gain branches in the same direction are defeated
Gain in the same direction can be realized by going out unit, and R, G, B tristimulus signal are carried out into branch process.
6. VGA vision signals branch system according to claim 5, it is characterised in that the RGB gain branches in the same direction are defeated
Going out unit includes single supply operational amplifier, and the single supply operational amplifier can expire width output, and with prohibiting function.
7. VGA vision signals branch system according to claim 6, it is characterised in that the single supply operational amplifier
Multiplication factor be 2 times.
8. VGA vision signals branch system according to claim 1, it is characterised in that the HS/VS drivings branch output
Unit includes the digit buffer of tri-state 8.
9. VGA vision signals branch system according to claim 8, it is characterised in that the digit buffer of tri-state 8 according to
The state of the control signal of described control unit, the address code in bus is kept in.
10. VGA vision signals branch system according to claim 8, it is characterised in that the G of the digit buffer of tri-state 8
Terminal ground, the level of output end changes with the level of input, realizes synchronous.
11. the VGA vision signal branch systems according to any one of claim 1 to claim 10, its feature exists
In the VGA videos branch system can be encapsulated as IC integrated circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710315761.XA CN107071232B (en) | 2017-05-08 | 2017-05-08 | VGA video signal shunting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710315761.XA CN107071232B (en) | 2017-05-08 | 2017-05-08 | VGA video signal shunting system |
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| CN107071232A true CN107071232A (en) | 2017-08-18 |
| CN107071232B CN107071232B (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710315761.XA Expired - Fee Related CN107071232B (en) | 2017-05-08 | 2017-05-08 | VGA video signal shunting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108182040A (en) * | 2017-12-07 | 2018-06-19 | 山东超越数控电子股份有限公司 | A kind of system that local and remote display is realized based on VGA all the way |
| CN109714500A (en) * | 2019-01-17 | 2019-05-03 | 中孚信息股份有限公司 | A kind of VGA video unidirectional transmission method and device |
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| KR20140037162A (en) * | 2014-01-28 | 2014-03-26 | 주식회사 디오에프연구소 | Multi-period sinusoidal video signal, camera trigger signal generator and structured light 3d scanner with the signal generator |
| CN205726072U (en) * | 2016-05-04 | 2016-11-23 | 深圳市东健宇电子有限公司 | A kind of high definition VGA signal distributor of high performance-price ratio |
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2017
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08191453A (en) * | 1995-01-06 | 1996-07-23 | Mitsubishi Electric Corp | Image input interface device |
| CN2338795Y (en) * | 1998-01-11 | 1999-09-15 | 张显达 | Arrangement for switching video data and audio data |
| CN1773599A (en) * | 2004-11-08 | 2006-05-17 | 三星电子株式会社 | Display device and driving device thereof |
| CN101043113A (en) * | 2006-03-22 | 2007-09-26 | 明基电通股份有限公司 | Image signal connecting circuit with power supplied by computer terminal |
| CN202103778U (en) * | 2011-06-23 | 2012-01-04 | 中国华录集团有限公司 | Video graphics array interface circuit |
| KR20140037162A (en) * | 2014-01-28 | 2014-03-26 | 주식회사 디오에프연구소 | Multi-period sinusoidal video signal, camera trigger signal generator and structured light 3d scanner with the signal generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108182040A (en) * | 2017-12-07 | 2018-06-19 | 山东超越数控电子股份有限公司 | A kind of system that local and remote display is realized based on VGA all the way |
| CN108182040B (en) * | 2017-12-07 | 2020-11-24 | 山东超越数控电子股份有限公司 | System for realizing local and remote display based on one-way VGA |
| CN109714500A (en) * | 2019-01-17 | 2019-05-03 | 中孚信息股份有限公司 | A kind of VGA video unidirectional transmission method and device |
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| CN107071232B (en) | 2020-05-19 |
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