CN215818398U - Video signal transmission anti-interference device - Google Patents
Video signal transmission anti-interference device Download PDFInfo
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- CN215818398U CN215818398U CN202121948936.9U CN202121948936U CN215818398U CN 215818398 U CN215818398 U CN 215818398U CN 202121948936 U CN202121948936 U CN 202121948936U CN 215818398 U CN215818398 U CN 215818398U
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- signal transmission
- common mode
- video signal
- filter circuit
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Abstract
The utility model discloses an anti-interference device for video signal transmission, which comprises a common mode filter circuit and a differential mode filter circuit which are arranged on a video signal transmission link, wherein the video signal transmission link is used for connecting a video data acquisition terminal and a video data processing terminal through a coaxial signal line, and the data acquisition terminal is arranged in a metal shielding case; the video signal transmission anti-interference device can effectively filter differential mode interference signals and common mode interference signals in a video signal transmission link, so that data entering a video data processing terminal are cleaner and more complete, the video quality is effectively improved, in addition, the influence of external interference signals on a data acquisition terminal can be effectively shielded through the arrangement of the shielding cover, and the quality of video data is improved from the source.
Description
Technical Field
The utility model relates to the technical field of video signal transmission, in particular to an anti-interference device for video signal transmission.
Background
The video display system mainly comprises a data acquisition terminal (comprising a camera) and a data processing terminal (comprising an image processor), wherein video signal transmission is generally carried out between the data acquisition terminal and the data processing terminal through a coaxial signal line. Although the coaxial signal line has the advantages of convenience in installation and low cost, the coaxial signal line has weak anti-interference capability, and in some occasions where interference signals are complex and strong, such as a vehicle-mounted display system, the video signals are greatly influenced in the process of being transmitted from the data acquisition terminal to the data processing terminal through the coaxial signal line, so that the quality of the video data to be displayed output by the data processing terminal is seriously influenced, and the phenomena of jitter, screen splash and the like of a display picture occur.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solve the above-mentioned problems, and an object of the present invention is to provide an anti-interference apparatus for video signal transmission, which can effectively improve the anti-interference capability during the video signal transmission process.
In order to achieve the purpose, the utility model discloses a video signal transmission anti-interference device which comprises a common mode filter circuit and a differential mode filter circuit which are arranged on a video signal transmission link, wherein the video signal transmission link is used for connecting a video data acquisition terminal and a video data processing terminal through a coaxial signal line, and the data acquisition terminal is arranged in a metal shielding case.
Preferably, the common mode filter circuit and the differential mode filter circuit are disposed in the video data processing terminal and electrically connected to a communication interface of the video data processing terminal.
Preferably, the common mode filter circuit includes a common mode inductor and a common mode capacitor, two input pins of the common mode inductor are respectively used for being connected with an output end and a ground end of the differential mode filter circuit, two output pins of the common mode inductor are respectively connected with two pins of the common mode capacitor, and two pins of the common mode capacitor are connected with a communication interface of the video data processing terminal.
Preferably, the differential mode filter circuit includes a differential mode capacitor and a differential mode resistor, an output terminal of the differential mode resistor is connected to an input pin of the common mode inductor, an input terminal of the differential mode resistor is used for being connected to the coaxial signal line, and the differential mode capacitor is connected between an output terminal of the differential mode resistor and ground.
Preferably, the system further comprises a static suppressor connected with a communication interface of the video data processing terminal.
Preferably, the static electricity suppressor includes a static electricity diode.
Compared with the prior art, the video signal transmission anti-interference device has the following technical effects:
1. because the common mode filter circuit and the differential mode filter circuit are arranged in the video signal transmission link, differential mode interference signals and common mode interference signals in the video signal transmission link can be effectively filtered, so that data entering the video data processing terminal are purer and more complete, and the video quality is effectively improved;
2. because the metal shielding cover is arranged on the data acquisition terminal, the influence of external interference signals on the data acquisition terminal can be effectively shielded, and the quality of video data is improved from the source.
Drawings
Fig. 1 is a schematic circuit connection diagram of a video signal transmission interference rejection apparatus according to an embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the present embodiment discloses an anti-interference device for video signal transmission, which is particularly suitable for a situation where an interference signal is relatively strong, such as a vehicle-mounted video device, and includes a common mode filter circuit 20 and a differential mode filter circuit 21 that are disposed on a video signal transmission link, where the video signal transmission link is used to connect a video data acquisition terminal 10 and a video data processing terminal 11 through a coaxial signal line 3, and the video data acquisition terminal 10 is disposed in a metal shielding case 4, and a light hole (not shown) may be opened on the shielding case 4, so that the video data acquisition terminal 10 acquires video data of an environment where the video data acquisition terminal is located. In this embodiment, the video signal transmission link is provided with the common mode filter circuit 20 and the differential mode filter circuit 21 to effectively filter the differential mode interference signal and the common mode interference signal in the video signal transmission link, so that the data entering the video data processing terminal 11 is more pure and complete, and the video quality is effectively improved. In addition, since the metal shielding case 4 is disposed on the video data acquisition terminal 10, the influence of external interference signals on the video data acquisition terminal 10 can be effectively shielded, thereby improving the quality of video data from the source.
Specifically, as shown in fig. 1, the common mode filter circuit 20 includes a common mode inductor L1 and a common mode capacitor C1, two input pins of the common mode inductor L1 are respectively used for connecting the output terminal and the ground terminal of the differential mode filter circuit 21, and in this embodiment, one input pin of the common mode inductor L1 is connected to the ground through a voltage dividing resistor R1. Two output pins of the common mode inductor L1 are connected to two pins of the common mode capacitor C1, respectively, and two pins of the common mode capacitor C1 are connected to the communication interface of the video data processing terminal 11. The differential mode filter circuit 21 comprises a differential mode capacitor C2 and a differential mode resistor R2, wherein the output end of the differential mode resistor R2 is connected with the input pin of the common mode inductor L1, the input end of the differential mode resistor R2 is used for being connected with the coaxial signal line 3, and the differential mode capacitor C2 is connected between the output end of the differential mode resistor R2 and the ground. In this embodiment, when the video data signal collected by the video data collecting terminal 10 reaches the video data processing terminal 11 through the coaxial signal line 3, the video data signal sequentially passes through the differential mode filter circuit 21 and the common mode filter circuit 20 and enters the video data processing terminal 11, so as to prevent an interference signal from entering the video data processing terminal 11.
Further, in order to avoid interference of static electricity on the video signal, the video signal transmission anti-interference apparatus in this embodiment further includes a static electricity suppressor connected to the communication interface of the video data processing terminal 11. In this embodiment, the esd suppressor includes an esd diode D1, and the esd diode D1 is connected to the signal input terminal of the differential mode resistor R2.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (6)
1. The video signal transmission anti-jamming device is characterized by comprising a common mode filter circuit and a differential mode filter circuit which are arranged on a video signal transmission link, wherein the video signal transmission link is used for connecting a video data acquisition terminal and a video data processing terminal through a coaxial signal line, and the data acquisition terminal is arranged in a metal shielding case.
2. The apparatus according to claim 1, wherein the common mode filter circuit and the differential mode filter circuit are disposed in the video data processing terminal and electrically connected to the communication interface of the video data processing terminal.
3. The apparatus according to claim 1, wherein the common mode filter circuit includes a common mode inductor and a common mode capacitor, two input pins of the common mode inductor are respectively configured to be connected to an output terminal and a ground terminal of the differential mode filter circuit, two output pins of the common mode inductor are respectively connected to two pins of the common mode capacitor, and two pins of the common mode capacitor are connected to the communication interface of the video data processing terminal.
4. The video signal transmission interference rejection unit according to claim 3, wherein said differential mode filter circuit comprises a differential mode capacitor and a differential mode resistor, an output terminal of said differential mode resistor is connected to an input pin of said common mode inductor, an input terminal of said differential mode resistor is used for being connected to said coaxial signal line, and said differential mode capacitor is connected between an output terminal of said differential mode resistor and ground.
5. The video signal transmission interference rejection unit according to claim 2, further comprising a static suppressor connected to a communication interface of said video data processing terminal.
6. The video signal transmission immunity device of claim 5, wherein said static suppressor includes a static diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121948936.9U CN215818398U (en) | 2021-08-18 | 2021-08-18 | Video signal transmission anti-interference device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121948936.9U CN215818398U (en) | 2021-08-18 | 2021-08-18 | Video signal transmission anti-interference device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215818398U true CN215818398U (en) | 2022-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121948936.9U Active CN215818398U (en) | 2021-08-18 | 2021-08-18 | Video signal transmission anti-interference device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215818398U (en) |
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2021
- 2021-08-18 CN CN202121948936.9U patent/CN215818398U/en active Active
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