Video surveillance method for eliminating interference sources

November 26 04:32:17, 2023

[ Pacific Security Network News ] The security industry has developed vigorously. Since the 1970s, it has been widely used in China. It has been fully understood and supported by people. Video surveillance is the main branch and user. With far-reaching influence, video surveillance mainly uses video baseband for efficient transmission. In the process of transmission, the image is transmitted effectively by coaxial cable, but it is very susceptible to interference during transmission, which makes the image appear reticulated. , horizontal stripes and noise affect the monitoring effect. Therefore, in response to the problem of interference in video surveillance, today we find the source of interference and completely eliminate it.
1. When the video surveillance image appears static horizontal stripes, the analysis reason is that English love belongs to low frequency interference. This is because the frequency band narrowing only uses 20Hz~nHz in the transmission process, so the coaxial cable is used in the video surveillance video transmission process. To solve the problem, the shielding layer anti-interference curve characteristics indicate that the higher the interference signal frequency, the better the shielding performance, and the pale frequency interference such as carrier phone and cable station is pale and weak. It is necessary to choose the right cable.
2. If there is a horizontal band where the snowflake noise keeps scrolling, it is the phenomenon that the camera end and the monitoring device end are grounded at the same time. Some harmonic components of the ground current fall into the video core wire, causing the core wire and the shielding layer to be between The interference potential is generated, and the interference signal is added to the video signal to form an interference to the monitoring image.
3. Video surveillance also has a high-brightness situation. The most common use of video transmission is coaxial cable, but strong high-frequency interference signals can also interfere with the transmission of images, and the fundamental and harmonics of high-frequency interference signals. The frequencies are all within 45MHz.
4. The image has a texture and there is noise. The potential difference between the ground and the earth is a situation that belongs to the static phenomenon. The potential difference is similar to the two points in the video surveillance image. Interference should be taken seriously. In the case of serious damage to the interface chip, damage may occur.
5. Have you found that sometimes the image is ghosted? The reason is also this, which is caused by the mismatch of the video signal coaxial network.
6. The video surveillance image appears densely diagonally, sometimes overwhelming the image. This is because the condition that the monitoring cable is erected in the air is caused by the interference of electromagnetic waves in the air.
The above content will be analyzed and explained by the security industry, and the necessary links and explanations will be made from the overall construction. Let the video surveillance get a broader development space, the image display is more clear, and the customer's trust is obtained.

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