CN201491136U - Video signal distributor - Google Patents
Video signal distributor Download PDFInfo
- Publication number
- CN201491136U CN201491136U CN2009202164689U CN200920216468U CN201491136U CN 201491136 U CN201491136 U CN 201491136U CN 2009202164689 U CN2009202164689 U CN 2009202164689U CN 200920216468 U CN200920216468 U CN 200920216468U CN 201491136 U CN201491136 U CN 201491136U
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- Prior art keywords
- signal
- integrated
- video distributor
- circuit
- video
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- 230000001681 protective effect Effects 0.000 claims description 19
- 230000003321 amplification Effects 0.000 claims description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- 239000003086 colorant Substances 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 206010045178 Tunnel vision Diseases 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- Processing Of Color Television Signals (AREA)
Abstract
The utility model provides a video signal distributor, which relates to the field of video signals. Compared with a traditional video signal frequency divider, the video signal distributor has wider bandwidth, can adapt a plurality of video signals, simultaneously has simple circuit structure and is convenient to carry. The video signal distributor provided by the utility model comprises a front electrostatic protection circuit, a filter circuit and an integrated amplifying circuit, wherein a path of video signal sequentially passes through the front electrostatic protection circuit and the filter circuit and is then input to the integrated amplifying circuit, and more than two paths of identical video signals are output after the video signal is amplified by the integrated amplifying circuit. Preferably, the provided video signal distributor also comprises a signal isolating circuit and a rear electrostatic protection circuit, wherein the more than two paths of identical video signals output by the integrated amplifying circuit respectively sequentially pass through the signal isolating circuit and the rear electrostatic protection circuit and are then output.
Description
Technical field
The utility model relates to the vision signal field, particularly a kind of video distributor that is used to distribute vision signal.
Background technology
In TV monitor system, the vision signal of signal generator output, for example the RGB rgb signal of three primary colors line often will offer many monitors or other video equipments and use.In addition; when under lab developing new machine; use CVBS ((Composite Video Broadcast Signal, Composite Video Broadcast Signal), aberration line YPBPR signal through regular meeting; three primary colors line RGB rgb signal etc.; in order to compare,, need the identical vision signal of multichannel input usually so that pinpoint the problems with other model machines; at this moment just need to use a video distributor, with the identical output signal of output multichannel behind one road input signal process video distributor.
In realizing process of the present utility model, the inventor discovers: present video distributor, or limited bandwidth, can only for example only can carry out adaptive to the SD signal to a certain bandwidth signal; The circuit structure complexity, equipment is huge, is inconvenient to carry.
The utility model content
The utility model provides a kind of video distributor, has the bandwidth of broad, can carry out adaptively to the various video signal, and simultaneously circuit structure is simple, easy to carry.
For achieving the above object; a kind of video distributor that the utility model embodiment provides; comprise preposition electrostatic discharge protective circuit, filter circuit and integrated amplifier; one tunnel vision signal is successively through inputing to described integrated amplifier behind described preposition electrostatic discharge protective circuit and the described filter circuit; after the integrated amplification of described integrated amplifier, the above identical vision signal of output two-way.
Optimally; described video distributor also comprises signal isolation circuit and rearmounted electrostatic discharge protective circuit; identical vision signal more than the two-way of described integrated amplifier output is exported behind described signal isolation circuit and described rearmounted electrostatic discharge protective circuit respectively successively again.
The video distributor that the utility model provides, the vision signal that can distribute comprises following one or more: Composite Video Broadcast Signal CVBS, three road signal Y of color difference components signal YPBPR, PB, PR, three road signal R, G, the B of RGB RGB three primary colors line; The integrated amplifier that adopts is any of EL2480 or max4012 integrated chip.
The video distributor that the utility model provides can also be to distributing with synchronous line synchronizing signal HS and the field sync signal VS of rgb signal; The integrated amplifier that adopts is the 74HC244 integrated chip.
In order to use RGB three primary colors line and aberration line YPBPR simultaneously, can adopt the mode of two EL2480, integrated amplification Y/G, PB/B, PR/R and two-way CVBS signal so simultaneously, and can adopt the mode integrated amplification simultaneously of two 74HC244 and synchronizing signal HS and the VS of RGB, can obtain maximum 8 tunnel identical vision signal like this.
The video distributor that the utility model provides can also comprise a USB interface, is used for directly getting power supply by the USB line from the USB interface of computer, is used for the power supply of above-mentioned integrated amplifier.
As seen from the above, by having adopted integrated amplifier, therefore have the bandwidth of broad in video distributor, can carry out adaptively to the various video signal, circuit structure is simple, easy to carry simultaneously.
Description of drawings
The structural representation of an embodiment of the video distributor that Fig. 1 provides for the utility model;
The structural representation of another embodiment of the video distributor that Fig. 2 provides for the utility model;
A circuit diagram of the video distributor that Fig. 3, Fig. 4 and Fig. 5 provide for the utility model.
Embodiment
Below in conjunction with drawings and Examples summary of the invention of the present utility model is further described.
See also Fig. 1; the video distributor that Fig. 1 provides for the utility model embodiment; comprise preposition electrostatic discharge protective circuit 11, filter circuit 12 and integrated amplifier 13; one tunnel vision signal 10 is successively through inputing to described integrated amplifier 13 behind described preposition electrostatic discharge protective circuit 11 and the described filter circuit 12; after described integrated amplifier 13 integrated amplifications, the above identical vision signal of output two-way (101,102...).
Wherein, preposition electrostatic discharge protective circuit 11 is used to prevent because of the easy body contact of input terminal, and the circuit chip of electrostatic damage video distributor inside; Filter circuit 12 is used for the noise of vision signal of input is carried out filtering, filters out the interference signal that the vision signal of input may be subjected to; What integrated amplifier 13 adopted is the integrated current feedback amplifier, can directly drive the load of several roads to the signal of exporting after the integrated amplification of electric current, realizes a distributor function that advances to have more.
And optimally; see also Fig. 2; above-mentioned video distributor can also comprise signal isolation circuit 21 and rearmounted electrostatic discharge protective circuit 22; one tunnel vision signal 10 is successively through inputing to above-mentioned integrated amplifier 13 behind above-mentioned preposition electrostatic discharge protective circuit 11 and the above-mentioned filter circuit 12; identical vision signal more than the two-way of described integrated amplifier 13 outputs is exported behind described signal isolation circuit 21 and described rearmounted electrostatic discharge protective circuit 22 respectively successively again.
Wherein, signal isolation circuit 21 is used to prevent that the several signals of exporting from interfering with each other, and its implementation can adopt bandwidth optical coupling isolator or additive method; Rearmounted electrostatic discharge protective circuit 22 is used to prevent because of the easy body contact of lead-out terminal, and the circuit chip of electrostatic damage video distributor inside.
Because the video distributor that provides of the utility model has adopted integrated amplifier, therefore have the bandwidth of broad, can carry out adaptively to the various video signal, circuit structure is simple, easy to carry simultaneously.
The video distributor that the utility model provides can distribute one or more following vision signal: CVBS signal, three road signal Y of color difference components signal YPBPR, PB, PR, three road signal R, G, the B of RGB RGB three primary colors line simultaneously.
Integrated amplifier can adopt the EL2480 integrated chip.The EL2480 integrated chip is one four tunnel an integrated current feedback amplifier, R/PR wherein, and G/Y, B/PB import three tunnel of EL2480 respectively, and CVBS imports the four the tunnel.EL2480 can adopt dual power supply, also can adopt single power supply, power supply can be imported by external power, also can be by the directly power taking from the computer USB interface of USB line, this moment, video distributor also should comprise a USB interface, was used for directly getting power supply by the USB line from the USB interface of computer; EL2480 in gain G=1 o'clock-three dB bandwidth 250MHz, the maximum output driving current of every passage is 55mA.Video distributor of the present utility model can adopt the mode of an EL2480, and each road vision signal (RGB/YPBPR/CVBS signal) input is exportable eight road signals at most.Certainly, above-mentioned vision signal is distributed, integrated amplifier also can adopt other such as integrated chips such as max4012.
In order to distribute row synchronous HS and the field sync signal VS synchronous with rgb signal, video distributor of the present utility model can adopt integrated amplification HS of 74HC244 integrated chip and VS signal.74HC244 is a integrated current feedback amplifier relatively cheap than EL2480, and one road HS and VS signal be maximum exportable eight road signals after two integrated amplifications of 74HC244 chip.
In order to use RGB three primary colors line and aberration line YPBPR simultaneously, can adopt the mode of two EL2480, integrated amplification Y/G, PB/B, PR/R and two-way CVBS signal so simultaneously, and can adopt mode integrated amplification simultaneously and synchronous line synchronizing signal HS and the field sync signal VS of rgb signal of two 74HC244, so just can obtain maximum 8 tunnel identical any vision signals simultaneously.
The circuit diagram of video distributor of the present utility model please be simultaneously referring to Fig. 3, Fig. 4 and Fig. 5, wherein the input and output terminal does not draw in circuit, what integrated amplifier adopted is the EL2480 integrated chip, be used for CVBS, three road signal Y of color difference components signal YPBPR, PB, PR, three road signal R of RGB RGB three primary colors line, among G, the B one or more carry out integrated amplification.The input and output circuit all is to be example with the Y/G signal in the drawings, and PB/B, PR/R, CVBS signal circuit schematic diagram are similar with it, and the output of Y/G signal has only identified two-way in the drawings, can export as required to reach 8 the tunnel.For HS and the VS signal synchronous with rgb signal, employing be the 74HC244 integrated chip, the output of HS and VS synchronizing signal has only identified one the tunnel in the drawings, also can export as required to reach 8 the tunnel.Power supply power supply 5V can be by the input of 12V power supply, also can pass through the directly power taking from the computer USB interface of USB line.
More specifically, in Fig. 3, resistance R 1-R4, R10-R12, R14 are that to be used to regulate output gain be 1; The resistance of R5-R8 and R15-R18 is to decide according to the DC level of integrated amplifier needs; C1 and C5 are capacitance, shield with resistance R 9 and R13 respectively, are used to absorb the impulse disturbances that other terminals are come; VD1 and VD2 are respectively the rearmounted electrostatic discharge protective circuit of Y/G two-way output signal.
In Fig. 4, VD3 is the preposition electrostatic discharge protective circuit of Y/G input signal, and L1 and C8 constitute filter circuit, are used for the input signal noise is carried out filtering; R19 is the input signal matched impedance, and C7 is an ac coupling capacitor, and purpose is to remove flip-flop, and the back circuit carries out direct current according to the requirement of chip again and recovers.
In Fig. 5, VD4 and VD5 are preposition electrostatic discharge protective circuit, and VD6 and VD7 are rearmounted electrostatic discharge protective circuit; R20 and C11 constitute filter circuit together, can the filtering radio-frequency component, if the HS signal has big potential pulse input simultaneously, R20 also can protect chip, and in like manner, R22 and C12 constitute filter circuit together, are used for the radio-frequency component of filtering HS signal; C9 and C10 are capacitance, shield with resistance R 21 and R23 respectively, are used to absorb the impulse disturbances that other terminals are come.
More than a kind of video distributor provided by the utility model is described in detail, the content of specification just is used for help understanding method of the present utility model and thought thereof; Anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, can expect easily changing or replacing, all should be encompassed within the protection range of the present utility model.
Claims (10)
1. video distributor; it is characterized in that; comprise preposition electrostatic discharge protective circuit, filter circuit and integrated amplifier; one tunnel vision signal is successively through inputing to described integrated amplifier behind described preposition electrostatic discharge protective circuit and the described filter circuit; after the integrated amplification of described integrated amplifier, the above identical vision signal of output two-way.
2. video distributor as claimed in claim 1; it is characterized in that; described video distributor also comprises signal isolation circuit and rearmounted electrostatic discharge protective circuit; identical vision signal more than the two-way of described integrated amplifier output is exported behind described signal isolation circuit and described rearmounted electrostatic discharge protective circuit respectively successively again.
3. video distributor as claimed in claim 1 or 2, it is characterized in that, described vision signal comprises following one or more: Composite Video Broadcast Signal CVBS, three road signal Y of color difference components signal YPBPR, PB, PR, three road signal R, G, the B of RGB RGB three primary colors line.
4. video distributor as claimed in claim 3 is characterized in that, described integrated amplifier is any of EL2480 or max4012 integrated chip.
5. video distributor as claimed in claim 3 is characterized in that, described vision signal also comprises: line synchronizing signal HS and the field sync signal VS synchronous with rgb signal.
6. video distributor as claimed in claim 5 is characterized in that, the integrated amplifier that is used for described HS of integrated amplification and VS is the 74HC244 integrated chip.
7. video distributor as claimed in claim 3 is characterized in that, described integrated amplifier comprises two EL2480 or max4012 integrated chip, is used for integrated amplification Y/G, PB/B, PR/R and CVBS signal simultaneously.
8. video distributor as claimed in claim 7 is characterized in that, after the integrated amplification of described integrated amplifier, exports 8 tunnel identical vision signal at most.
9. video distributor as claimed in claim 7 is characterized in that, described integrated amplifier also comprises a slice or two 74HC244 integrated chips, is used for integrated amplification simultaneously and synchronous HS and the VS signal of rgb signal.
10. video distributor as claimed in claim 1 or 2 is characterized in that, described video distributor also comprises a USB interface, is used for directly getting power supply by the USB line from the USB interface of computer, is used for the power supply of described integrated amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202164689U CN201491136U (en) | 2009-09-16 | 2009-09-16 | Video signal distributor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202164689U CN201491136U (en) | 2009-09-16 | 2009-09-16 | Video signal distributor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201491136U true CN201491136U (en) | 2010-05-26 |
Family
ID=42430000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202164689U Expired - Fee Related CN201491136U (en) | 2009-09-16 | 2009-09-16 | Video signal distributor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201491136U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332246A (en) * | 2011-09-28 | 2012-01-25 | 常州工学院 | A VGA demultiplexing circuit and its working method |
| CN102695029A (en) * | 2012-05-11 | 2012-09-26 | 易程（苏州）智能系统有限公司 | Video signal remote transmission system |
| CN114760424A (en) * | 2022-03-25 | 2022-07-15 | 深圳市锐明技术股份有限公司 | Signal forwarding method, circuit, device and signal distribution testing device |
-
2009
- 2009-09-16 CN CN2009202164689U patent/CN201491136U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332246A (en) * | 2011-09-28 | 2012-01-25 | 常州工学院 | A VGA demultiplexing circuit and its working method |
| CN102332246B (en) * | 2011-09-28 | 2014-04-09 | 常州工学院 | Video graphics array (VGA) multi-channel distribution circuit and working method thereof |
| CN102695029A (en) * | 2012-05-11 | 2012-09-26 | 易程（苏州）智能系统有限公司 | Video signal remote transmission system |
| CN114760424A (en) * | 2022-03-25 | 2022-07-15 | 深圳市锐明技术股份有限公司 | Signal forwarding method, circuit, device and signal distribution testing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20120916 |