CN201887879U - Video extender - Google Patents
Video extender Download PDFInfo
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- CN201887879U CN201887879U CN2010205916308U CN201020591630U CN201887879U CN 201887879 U CN201887879 U CN 201887879U CN 2010205916308 U CN2010205916308 U CN 2010205916308U CN 201020591630 U CN201020591630 U CN 201020591630U CN 201887879 U CN201887879 U CN 201887879U
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- signal decoding
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Abstract
The utility model relates to a signal communication device, and discloses a video extender, which comprises a transmitting circuit and a receiving circuit. The transmitting circuit is connected with the receiving circuit by a network cable and comprises a VGA (video graphic array) input interface, an encoding chip, an RJ45 output interface and a microcontroller, and the receiving circuit consists of an RJ45 input interface, a HV (high voltage) signal decoding chip, an RGB (red, green and blue) signal decoding chip, a microcontroller and a VGA output interface. The video extender can realize long-distance non-distortion video signal transmission.
Description
Technical field
The utility model relates to a kind of signal and communication device, is specifically related to a kind of video extender.
Background technology
In systems such as railway, security protection, often need the vision signal that monitor image capture devices such as (cameras) collects is delivered to the Control Room unified management through the transmission of a segment distance.The signal that common video capture device collects can not transmit 30 meters at most before handling through extender, can not satisfy user's demand, therefore, has influenced monitor and has normally used.
The utility model content
The purpose of this utility model provides the video extender of the undistorted transmission video signal of the long distance of a kind of energy.
In order to achieve the above object, the utility model has following technical scheme:
A kind of video extender of the present utility model, comprise transtation mission circuit, receiving circuit, transtation mission circuit is connected with receiving circuit by netting twine, described transtation mission circuit comprises VGA input interface, coding chip, RJ45 output interface, microcontroller, described VGA input interface is connected with coding chip, and coding chip is connected with RJ45 output interface, microcontroller respectively; Described receiving circuit comprises RJ45 input interface, HV signal decoding chip, rgb signal decoding chip, microcontroller, VGA output interface, described RJ45 input interface is connected with HV signal decoding chip, rgb signal decoding chip respectively, HV signal decoding chip, rgb signal decoding chip are connected with the VGA output interface respectively, and described microcontroller is connected with HV signal decoding chip, rgb signal decoding chip respectively.
Wherein, described netting twine is a Category-5 twisted pair.
Owing to taked above technical scheme, advantage of the present utility model is:
1, the utility model has solved this problem of the undistorted transmission video signal of long distance.
2, the utility model utilizes common Category-5 twisted pair transmission, and the prolongation distance of transmission can reach 300m.
Description of drawings
Fig. 1 is a structure block diagram of the present utility model.
Among the figure, 1, transtation mission circuit; 2, receiving circuit.
Embodiment
Following examples are used to illustrate the utility model, but are not used for limiting scope of the present utility model.
Referring to Fig. 1, a kind of video extender of the present utility model, form by transtation mission circuit 1, receiving circuit 2, transtation mission circuit 1 is connected with receiving circuit 2 by Category-5 twisted pair, described transtation mission circuit 1 is made up of VGA input interface, coding chip, RJ45 output interface, microcontroller, described VGA input interface is connected with coding chip, and coding chip is connected with RJ45 output interface, microcontroller respectively; Described receiving circuit 2 is made up of RJ45 input interface, HV signal decoding chip, rgb signal decoding chip, microcontroller, VGA output interface, described RJ45 input interface is connected with HV signal decoding chip, rgb signal decoding chip respectively, HV signal decoding chip, rgb signal decoding chip are connected with the VGA output interface respectively, and described microcontroller is connected with HV signal decoding chip, rgb signal decoding chip respectively.
The utility model utilizes coding chip that vision signal is enrolled H, V signal with the mode of differential coding at transmitting terminal and forms three pairs of differential pairs in the rgb signal, sending into twisted-pair feeder transmits, utilize the decoding chip corresponding to be decoded as the VGA signal again the signal that receives at receiving terminal, send into display and show with coding chip.
It is the microcontroller of AT89S52 that the utility model adopts model, is responsible for the initialization of coding chip and decoding chip.The model of described coding chip is EL4543, and the model of described decoding chip is EL5375, EL8201IS.
Referring to Fig. 1, the utility model entire equipment is divided into transmission and receives two parts, initial VGA signal is input to the VGA input interface of transmitting terminal, signal flows into the EL4543 coding chip, the EL4543 coding chip is that three road differential pairs are sent into the RJ45 output interface with the VGA signal encoding of standard, is exported by Category-5 twisted pair; After the certain distance transmission, signal flows into the RJ45 input interface of receiving terminal, be divided into two-way, the EL8201 decoding chip of leading up to comes out the HV Signal Separation, another road recovers original rgb signal by the EL5375 decoding chip, signal after the two-way recovery is received the VGA output interface simultaneously, and the VGA signal of the outflow of VGA output interface just can be connected to the display of far-end like this.
The utility model utilizes the EL4543 coding chip of intersil company and EL5375, EL8201IS decoding chip simulation triple channel difference codec chip well to solve this problem of the undistorted transmission video signal of long distance.Usually the VGA signal that utilizes the VGA extended line to prolong is non-balance transmission mode, in this manner the VGA signal through long Distance Transmission have loss, phenomenon such as crosstalk causes image fault.After utilizing technical solutions of the utility model, transfer vision signal to balance transmission (differential transfer just) by non-equilibrium coding, crosstalk signal will be cancelled each other at receiving terminal, thereby improve transmission range and picture quality greatly.
Obviously, the foregoing description of the present utility model only is for the utility model example clearly is described, and is not to be qualification to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here can't give exhaustive to all execution modes.Everyly belong to the row that conspicuous variation that the technical solution of the utility model extends out or change still are in protection range of the present utility model.
Claims (2)
1. video extender, comprise transtation mission circuit, receiving circuit, transtation mission circuit is connected with receiving circuit by netting twine, it is characterized in that: described transtation mission circuit comprises VGA input interface, coding chip, RJ45 output interface, microcontroller, described VGA input interface is connected with coding chip, and coding chip is connected with RJ45 output interface, microcontroller respectively; Described receiving circuit comprises RJ45 input interface, HV signal decoding chip, rgb signal decoding chip, microcontroller, VGA output interface, described RJ45 input interface is connected with HV signal decoding chip, rgb signal decoding chip respectively, HV signal decoding chip, rgb signal decoding chip are connected with the VGA output interface respectively, and described microcontroller is connected with HV signal decoding chip, rgb signal decoding chip respectively.
2. according to the described a kind of video extender of claim 1, it is characterized in that: described netting twine is a Category-5 twisted pair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205916308U CN201887879U (en) | 2010-11-04 | 2010-11-04 | Video extender |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205916308U CN201887879U (en) | 2010-11-04 | 2010-11-04 | Video extender |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201887879U true CN201887879U (en) | 2011-06-29 |
Family
ID=44185421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205916308U Expired - Fee Related CN201887879U (en) | 2010-11-04 | 2010-11-04 | Video extender |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201887879U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105227888A (en) * | 2015-09-25 | 2016-01-06 | 山东超越数控电子有限公司 | A kind of dispensing device of VGA vision signal, receiving system and transmission system |
| US10827148B2 (en) | 2016-12-23 | 2020-11-03 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
-
2010
- 2010-11-04 CN CN2010205916308U patent/CN201887879U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105227888A (en) * | 2015-09-25 | 2016-01-06 | 山东超越数控电子有限公司 | A kind of dispensing device of VGA vision signal, receiving system and transmission system |
| US10827148B2 (en) | 2016-12-23 | 2020-11-03 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
| US11190730B2 (en) | 2016-12-23 | 2021-11-30 | Zhejiang Dahua Technology Co., Ltd. | Video extenders, control methods therefor and coaxial video-controlling transmission devices |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110629 Termination date: 20141104 |
|
| EXPY | Termination of patent right or utility model |