CN109714500A - A kind of VGA video unidirectional transmission method and device - Google Patents
A kind of VGA video unidirectional transmission method and device Download PDFInfo
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- CN109714500A CN109714500A CN201910043411.1A CN201910043411A CN109714500A CN 109714500 A CN109714500 A CN 109714500A CN 201910043411 A CN201910043411 A CN 201910043411A CN 109714500 A CN109714500 A CN 109714500A
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- vga
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- operational amplifier
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- gate circuit
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Abstract
A kind of VGA video unidirectional transmission method is amplified again this method comprises: carrying out signal list using operational amplifier to the RGB tristimulus signals in the VGA for being sent to display equipment；Or, carrying out logic and operation processing using AND gate circuit to row/field sync signal in the VGA signal for being sent to display equipment.It further include a kind of VGA video one-way transmission apparatus.
Description
Technical field
The present invention relates to sensitive data protection technology field, specifically a kind of VGA video unidirectional transmission method and dress
It sets.
Background technique
When we use external display device, especially projector, different host equipments can be often accessed.Some
The Administrative Area of data protection sensitivity will have the external display devices such as different safety class host shared access projector
Application scenarios.After showing that equipment is illegally transformed, which can become different safety class data between hosts ferry-boat tool.
After being digitally converted the VGA data in host, sent via optic module, then simulated
Change the technical approach that conversion is sent to display equipment.But there are the following problems for which:
(1) vision signal that host is sent to display equipment needs to will cause image mistake through overcompression and decompression process
Very, situations such as lacking or be asynchronous.
(2) be sent to display equipment vision signal cannot adapt to completely display needed for display resolution.
(3) cost of implementation is higher, is unfavorable for subsequent product popularization.
Summary of the invention
A kind of VGA video unidirectional transmission method and device are provided in the embodiment of the present invention, it is in the prior art to solve
The problem of VGA transmission of video is easy distortion, missing or asynchronous, cannot adapt to the resolution ratio of display completely.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical solutions:
First aspect present invention provides a kind of VGA video unidirectional transmission method, this method comprises:
Signal list is carried out using operational amplifier to the RGB tristimulus signals in the VGA for being sent to display equipment to amplify again；
Or,
Logic and operation is carried out using AND gate circuit to row/field sync signal in the VGA signal for being sent to display equipment
Processing.
With reference to first aspect, in a first possible implementation of that first aspect, to the RGB tristimulus signals in VGA
Amplified again using operational amplifier progress signal list and specifically included:
The end IN+ of the RGB tristimulus signals access operational amplifier of the VGA of host side, shows the RGB tri- of the VGA of equipment
Primary colour signal connects OUT terminal, amplifies processing to signal using negative-feedback.
With reference to first aspect, in a second possible implementation of that first aspect, to row/field synchronization in VGA signal
Signal carries out logic and operation processing using AND gate circuit and specifically includes:
A terminates positive supply, and the end B inputs row/field sync signal of VGA, and row/field sync signal of the end Y outputting VGA is extremely shown
Equipment.
Second aspect of the present invention provides a kind of VGA video one-way transmission apparatus, utilizes the method, device setting
Between host and display device, for the VGA vision signal of host side to be one-way transmitted to display device, which includes:
Operational amplifier or/and, AND gate circuit.
In conjunction with second aspect, in second aspect in the first possible implementation, the operational amplifier for pair
The RGB tristimulus signals of VGA amplify processing；
The AND gate is used for the row to VGA/field sync signal and carries out logical operation.
The device of second aspect of the present invention can be realized in each implementation of first aspect and first aspect
Method, and obtain identical effect.
By above technical scheme as it can be seen that the present invention using operational amplifier or/and, AND gate circuit is realized to VGA video
Unidirectional reliable transmission.Operational amplifier is for amplifying processing to the RGB tristimulus signals of VGA；AND gate circuit for pair
The row of VGA/field sync signal carries out logical operation.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the application method schematic diagram of the operational amplifier of the embodiment of the present invention；
Fig. 2 is the application method schematic diagram of the AND gate circuit of the embodiment of the present invention.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
A kind of VGA video unidirectional transmission method, this method comprises:
Signal list is carried out using operational amplifier to the RGB tristimulus signals in the VGA for being sent to display equipment to amplify again；
Or,
Logic and operation is carried out using AND gate circuit to row/field sync signal in the VGA signal for being sent to display equipment
Processing.
As shown in Figure 1, carry out signal list using operational amplifier to the RGB tristimulus signals in VGA amplifies specific packet again
It includes:
The end IN+ of the RGB tristimulus signals access operational amplifier of the VGA of host side, shows the RGB tri- of the VGA of equipment
Primary colour signal connects OUT terminal, amplifies processing to signal using negative-feedback.
The end VIN+ is the insulated gate grade of a NMOS, and feedback end VIN- is the insulated gate electrode of another NMOS, and the end VOUT is
The end S at the end D of the end the V+ PMOS of the third level and the end V- NMOS in chip.Middle layer is passed through by the grid of control NMOS in the end VIN+
Amplification after, be indirectly transferred to the end VOUT, wherein without immediate data access, according to the characteristic of metal-oxide-semiconductor, the voltage at the end VOUT becomes
Change can not pass to the end VIN+.Similarly, voltage change can not also be passed to the end VIN+ by the end VIN-.
As shown in Fig. 2, carrying out logic and operation processing tool using AND gate circuit to row/field sync signal in VGA signal
Body includes:
A terminates positive supply, and the end B inputs row/field sync signal of VGA, and row/field sync signal of the end Y outputting VGA is extremely shown
Equipment.
A terminate positive supply after, the end Y can change with the variation at the end B, but the end B control be T2 and T4 insulated gate electrode, Y
End is the end D and the end S of T5 and T6, therefore the end Y can not influence the end B, and the end B can not detect the variation at the end Y.
A kind of VGA video one-way transmission apparatus, the device are arranged between host and display device, for by host side
VGA vision signal is one-way transmitted to display device, the device include: operational amplifier or/and, AND gate circuit.
Operational amplifier is for amplifying processing to the RGB tristimulus signals of VGA；AND gate circuit be used for the row of VGA/
Field sync signal carries out logical operation.
The above is only a specific embodiment of the invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (5)
1. a kind of VGA video unidirectional transmission method, characterized in that this method comprises:
Signal list is carried out using operational amplifier to the RGB tristimulus signals in the VGA for being sent to display equipment to amplify again；Or,
Logic and operation processing is carried out using AND gate circuit to row/field sync signal in the VGA signal for being sent to display equipment.
2. a kind of VGA video unidirectional transmission method according to claim 1, characterized in that the RGB three primary colours in VGA
Signal is amplified again using operational amplifier progress signal list to be specifically included:
The end IN+ of the RGB tristimulus signals access operational amplifier of the VGA of host side, shows the RGB three primary colours of the VGA of equipment
Signal connects OUT terminal, amplifies processing to signal using negative-feedback.
3. a kind of VGA video unidirectional transmission method according to claim 1, characterized in that row/field in VGA signal
Synchronization signal carries out logic and operation processing using AND gate circuit and specifically includes:
A terminates positive supply, and the end B inputs row/field sync signal of VGA, and row/field sync signal to the display of the end Y outputting VGA is set
It is standby.
4. a kind of VGA video one-way transmission apparatus utilizes method described in claim 1-3 any one, characterized in that the dress
It installs between host and display device, for the VGA vision signal of host side to be one-way transmitted to display device, the device
Include: operational amplifier or/and, AND gate circuit.
5. a kind of VGA video one-way transmission apparatus according to claim 4, characterized in that the operational amplifier is used
Processing is amplified in the RGB tristimulus signals to VGA；
The AND gate circuit is used for the row to VGA/field sync signal and carries out logical operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910043411.1A CN109714500A (en) | 2019-01-17 | 2019-01-17 | A kind of VGA video unidirectional transmission method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910043411.1A CN109714500A (en) | 2019-01-17 | 2019-01-17 | A kind of VGA video unidirectional transmission method and device |
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| Publication Number | Publication Date |
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| CN109714500A true CN109714500A (en) | 2019-05-03 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910043411.1A Pending CN109714500A (en) | 2019-01-17 | 2019-01-17 | A kind of VGA video unidirectional transmission method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110971613A (en) * | 2019-12-16 | 2020-04-07 | 中铁信安(北京)信息安全技术有限公司 | Audio and video signal light unidirectional transmission device and method |
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| CN202103778U (en) * | 2011-06-23 | 2012-01-04 | 中国华录集团有限公司 | Video graphics array interface circuit |
| CN202230719U (en) * | 2011-09-28 | 2012-05-23 | 常州工学院 | Distribution device of VGA video signal |
| CN202838923U (en) * | 2012-10-16 | 2013-03-27 | 南开大学 | Minitype near-eye display connector drive and control circuit structure |
| CN203492117U (en) * | 2013-09-17 | 2014-03-19 | 北京畅易行科技有限公司 | An apparatus for achieving a multichannel video function in vehicle-mounted application |
| 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 |
| CN107071232A (en) * | 2017-05-08 | 2017-08-18 | 微迪科技（大连）有限公司 | VGA vision signal branch systems |
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2019
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2239634Y (en) * | 1995-11-24 | 1996-11-06 | 南京远志资讯科技开发有限公司 | Computer film acoustics controller |
| CN101483736A (en) * | 2008-12-23 | 2009-07-15 | 康佳集团股份有限公司 | Television set with spectrum display function |
| CN202103778U (en) * | 2011-06-23 | 2012-01-04 | 中国华录集团有限公司 | Video graphics array interface circuit |
| CN202230719U (en) * | 2011-09-28 | 2012-05-23 | 常州工学院 | Distribution device of VGA video signal |
| CN202838923U (en) * | 2012-10-16 | 2013-03-27 | 南开大学 | Minitype near-eye display connector drive and control circuit structure |
| CN203492117U (en) * | 2013-09-17 | 2014-03-19 | 北京畅易行科技有限公司 | An apparatus for achieving a multichannel video function in vehicle-mounted application |
| 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 |
| CN107071232A (en) * | 2017-05-08 | 2017-08-18 | 微迪科技（大连）有限公司 | VGA vision signal branch systems |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110971613A (en) * | 2019-12-16 | 2020-04-07 | 中铁信安(北京)信息安全技术有限公司 | Audio and video signal light unidirectional transmission device and method |
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Application publication date: 20190503 |
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