One defense: fortification, to block the interference, measures:
1. The cable goes through galvanized iron pipe and goes through the metal trunking;
2. Buried cable;
3. Adopt double insulated and double shielded anti-jamming coaxial cable;
4. The camera is insulated from the shield, and the shield is connected to the ground;
Second avoid: Change the original video signal transmission frequency band or transmission method to avoid interference within the video bandwidth, measures:
1. Using optical cable, microwave, radio frequency and other modulation methods;
2. Adopt digital transformation, processing and transmission methods;
Third antibody: external electromagnetic interference has been "mixed into the video signal" through the transmission cable, the solution is "anti-", the measures are:
l Transmission transformer suppresses 50 / 100Hz low frequency interference;
l "Chopping" technology;
l Video pre-amplification improves the "signal / interference" ratio (signal-to-noise ratio) technology: in theory, it should be feasible in practice. However, there is still room for improvement in dealing with cable transmission distortion and additional amplification distortion.
l "Weighted anti-jamming device" does not modulate or transform, maintains the original video baseband transmission mode, and has the dual functions of suppressing interference and video recovery.
Four supplements: Anti-interference is one of the measures to improve the image quality. At the same time, it is necessary to compensate for the attenuation and distortion introduced by the transmission cable and equipment, restore the original characteristics of the video signal, and ensure the image quality. "Weighted anti-jamming device" and "video recovery host" have image quality control recovery function;
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The four basic essentials of anti-interference are different measures taken from different technical sides, mastering their principles, performance and use methods, and flexibly using them in engineering to be invincible.
Regarding the four basic essentials of anti-jamming, this formulation is just a personal opinion, not necessarily accurate. The purpose is to understand and choose the anti-jamming technical measures of the project, and strive to explore a clear and clear concept and essentials. No longer be at a loss, no longer at a loss, no longer be influenced by misleading propaganda, and make more and higher-level model projects.
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