Analyze whether the returned image from the camera is disturbed?
(1) Strong electrical interference. When a strong cable is working, the voltage is large, and a specific magnetic field will be generated around the cable. Therefore, when laying the camera cable, try to avoid laying parallel cables with strong cables.
(2) Camera power supply interference. This situation is relatively rare. The reason for this is that the coil of the camera's transformer resonates with the frequency of the supply current, which causes the camera image to interfere. This situation should not be searched. Even if a signal anti-jamming device is added to the camera, the image signal will also have interference. So when there is interference in the video signal, you can not find the interference source. Try to change the transformer to the camera!
(3) Reflection interference. Any signal transmission line, for a certain frequency signal, there is a certain non-pure impedance of the impedance, its value and integrated circuit output impedance and input impedance are different in value, when they are connected, it is bound to There are some impedance discontinuities. When the signal passes through these discontinuities, "reflection" occurs, causing waveform distortion and reflection. In addition, longer transmission lines must have large distributed capacitance and stray inductance, and there will be a delay in signal transmission. The higher the signal frequency is, the more obvious the delay will be, and the more serious the reflection will be, the more distortion the signal waveform will generate. Powerful. This is the so-called "long-line transmission reflection interference."