CN202103778U - Video graphics array interface circuit - Google Patents
Video graphics array interface circuit Download PDFInfo
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- CN202103778U CN202103778U CN2011202165265U CN201120216526U CN202103778U CN 202103778 U CN202103778 U CN 202103778U CN 2011202165265 U CN2011202165265 U CN 2011202165265U CN 201120216526 U CN201120216526 U CN 201120216526U CN 202103778 U CN202103778 U CN 202103778U
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Abstract
The utility model discloses a video graphics array interface circuit, comprising a VGA signal generating module used for outputting an RGB signal, a horizontal synchronizing signal and a field synchronizing signal; wherein, the VGA signal generating module is an embedded multimedia processing chip. The video graphics array interface circuit is also characterized in that a VGA signal processing module connected with the VGA signal generating module and used for processing the signal outputted by the VGA signal generating module into a standard VGA interface signal and a VGA signal outputting module connected with the VGA signal processing module and used for outputting the data processed by the VGA signal processing module to an outer displaying device are also comprised. The video graphics array interface circuit is simple, stable and reliable in structure, the technological advance is that a VGA interface as an embedded video decoding playing device enables a computer display and a novel simulative TV to receive digital TV programs, improving the color resolution of the simulative TV effectively, and making the received image clear and stable. The video graphics array interface circuit can be widely used in the embedded application fields, such as IP set top box, digital monitoring system, multimedia information issuing system, etc.
Description
Technical field
The utility model relates to high definition Display Technique field, relates in particular to Video Graphics Array interface circuit in a kind of STB.
Background technology
Along with the continual renovation of television system, novel TV has expanded increasing interface, like Video Graphics Array (VGA) interface etc.Yet existing STB generally only possesses complex tone video output interface general-purpose interfaces such as (RCA interfaces), does not but consider the application of VGA interface.VGA has the resolution height, shows advantages such as speed is fast, color is abundant as a general calculation machine display interface, has obtained using widely in the color monitor field, also on some novel analog TVs, plurality of applications has been arranged simultaneously.And present most STB has only been considered the RCA interface; Do not have the VGA interface; Thereby make the use object of STB receive very big restriction, can only be confined to connect computer display and novel analog TV on traditional TV that possesses audio-video interfaces commonly used such as RCA.Along with the continuous increase of high definition display device and built-in browser application demand, above-mentioned limitation has greatly limited the extensive use of STB.
Summary of the invention
The utility model is directed against the proposition of above problem, and develops Video Graphics Array interface circuit in a kind of STB.The technological means that the utility model adopts is following:
A kind of Video Graphics Array interface circuit comprises the VGA signal generating module that is used to export rgb signal, line synchronizing signal and field sync signal, and said VGA signal generating module is the built-in multimedia process chip;
It is characterized in that also comprising:
Connect the VGA signal generating module, the signal processing of VGA signal generating module output is become the VGA signal processing module of standard VGA interface signal;
Connect the VGA signal processing module, the data after the VGA signal processing module is handled are exported to the VGA signal output module of external display device;
The connected mode of above-mentioned each module is that data connect.
Said VGA signal processing module comprises rgb signal processing module and row field sync signal processing module; Said rgb signal processing module is three road video filtering chip for driving, and its input pin is connected on DAC2_R_PR, DAC2_R_PB and the DAC2_R_Y pin of said VGA signal generating module; Said capable field sync signal processing module is a level transferring chip, and its input pin is connected on the synchronizing signal HSYNC and field sync signal VSYNC output pin of said VGA signal generating module.
Said VGA signal output module is the VGA accessory power outlet, and said VGA accessory power outlet is a D type interface.
The utility model is compared its advantage with prior art and is that circuit structure is simple, reliable and stable; Its technological progress is the VGA interface as embedded video decodes and plays equipment; But can make all receiving digital television programs of computer display and novel analog TV; Effectively improved the colour resolution of simulated television, the clear picture of being accepted is stable.This circuit can be widely used in Embedded Application fields such as IP STB, digital monitor system and multi-medium information spreading system.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the circuit theory diagrams of the utility model;
Embodiment
Video Graphics Array interface circuit as shown in Figure 1 comprises VGA signal generating module M100, VGA signal processing module M200 and VGA signal output module M300 three parts; Said VGA signal generating module M100 mainly is made up of built-in multimedia process chip 1, is responsible for rgb signal source, line synchronizing signal and field sync signal in the outputting VGA signal.Said VGA signal processing module M200 comprises rgb signal processing module M201 and row field sync signal processing module M202 two parts; Wherein rgb signal processing module M201 is made up of three road video filtering chip for driving 2, is responsible for handling the rgb signal source that VGA signal generating module M100 passes over; Row field sync signal processing module M202 is made up of level transferring chip 3, and line synchronizing signal and the field sync signal being responsible for passing over VGA signal generating module M100 are processed into the standard VGA interface signal.Said VGA signal output module M300 is made up of VGA accessory power outlet 4, is responsible for receiving standard VGA signal and the demonstration that VGA signal processing module M200 transmits.
Physical circuit as shown in Figure 2 is described below:
The built-in multimedia process chip 1 of said VGA signal generating module M100 is based on the digital media processor of the multiple form audio/video encoding/decoding of support of arm processor; It provides the rgb signal source DAC2_R_PR that handles through inner DAC, DAC2_R_PB, DAC2_R_Y 1 pin to three road video filtering chip for driving 2 of rgb signal processing module M201,2 pin, 3 pin as input, provides line synchronizing signal HSYNC and field sync signal VSYNC 9 pin and 12 pin to the level transferring chip 3 of capable field sync signal processing module M202 as input simultaneously.
Three road video filtering chip for driving 2 of rgb signal processing module M201 adopt the FMS6363 chip of FAIRCHILD or the SGM9116 chip of SGMC among the said VGA signal processing module M200; Reception is from the rgb signal source of built-in multimedia process chip 1, and it is handled back output RGB tricolor signal VGA_R, VGA_B, VGA_G.This chip can increase the signal driving force, guarantees the signal impedance coupling, and according to SD, high-definition video signal frequency the vision signal that is received is carried out Filtering Processing.The level transferring chip 3 of row field sync signal processing module M202 adopts the SN74LVT125 chip of T1 among the said VGA signal processing module M200; Support the level conversion of 5V input 3.3V output; The 3.3V level that line synchronizing signal HSYNC that built-in multimedia process chip 1 is provided and field sync signal VSYNC convert the VGA interface requirement to, and through line synchronizing signal HSYNCO and field sync signal VSYNCO after 8 pin and the 11 pin output conversion.
The VGA accessory power outlet 4 of said VGA signal output module M300 is a kind of D type interfaces; Have 15 pin holes above; Be divided into three rows; Five of every rows wherein the most important thing is 3 RGB color component signals and 2 scan-synchronized signals, receive the line synchronizing signal HSYNCO and the field sync signal VSYNCO of RGB tricolor signal VGA_R, VGA_B, VGA_G and level transferring chip 3 outputs from 2 outputs of three road video filtering chip for driving respectively; Under the assurance of line synchronizing signal HSYNCO and field sync signal VSYNCO, RGB tricolor signal VGA_R, VGA_B, VGA_G can normally export on display.
The above; Be merely the preferable embodiment of the utility model; But the protection range of the utility model is not limited thereto; Any technical staff who is familiar with the present technique field is equal to replacement or changes according to the technical scheme of the utility model and inventive concept thereof in the technical scope that the utility model discloses, and all should be encompassed within the protection range of the utility model.
Claims (3)
1. a Video Graphics Array interface circuit comprises the VGA signal generating module that is used to export rgb signal, line synchronizing signal and field sync signal, and said VGA signal generating module is the built-in multimedia process chip;
It is characterized in that also comprising:
Connect the VGA signal generating module, the signal processing of VGA signal generating module output is become the VGA signal processing module of standard VGA interface signal;
Connect the VGA signal processing module, the data after the VGA signal processing module is handled are exported to the VGA signal output module of external display device;
The connected mode of above-mentioned each module is that data connect.
2. a kind of Video Graphics Array interface circuit according to claim 1 is characterized in that said VGA signal processing module comprises rgb signal processing module and row field sync signal processing module; Said rgb signal processing module is three road video filtering chip for driving, and its input pin is connected on DAC2_R_PR, DAC2_R_PB and the DAC2_R_Y pin of said VGA signal generating module; Said capable field sync signal processing module is a level transferring chip, and its input pin is connected on the synchronizing signal HSYNC and field sync signal VSYNC output pin of said VGA signal generating module.
3. a kind of Video Graphics Array interface circuit according to claim 1 is characterized in that said VGA signal output module is the VGA accessory power outlet, and said VGA accessory power outlet is a D type interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202165265U CN202103778U (en) | 2011-06-23 | 2011-06-23 | Video graphics array interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202165265U CN202103778U (en) | 2011-06-23 | 2011-06-23 | Video graphics array interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202103778U true CN202103778U (en) | 2012-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202165265U Expired - Lifetime CN202103778U (en) | 2011-06-23 | 2011-06-23 | Video graphics array interface circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202103778U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071232A (en) * | 2017-05-08 | 2017-08-18 | 微迪科技（大连）有限公司 | VGA vision signal branch systems |
| 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 |
| WO2023065500A1 (en) * | 2021-10-19 | 2023-04-27 | 谢文军 | Method for collecting digital signal for synchronously controlling lamplight from video signal |
-
2011
- 2011-06-23 CN CN2011202165265U patent/CN202103778U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071232A (en) * | 2017-05-08 | 2017-08-18 | 微迪科技（大连）有限公司 | VGA vision signal branch systems |
| CN107071232B (en) * | 2017-05-08 | 2020-05-19 | 微迪科技（大连）有限公司 | VGA video signal shunting system |
| 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 |
| WO2023065500A1 (en) * | 2021-10-19 | 2023-04-27 | 谢文军 | Method for collecting digital signal for synchronously controlling lamplight from video signal |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120104 |
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| CX01 | Expiry of patent term |