1. Shielding is the use of electrically conductive or magnetically conductive materials made of box-like or shell-like shielding, the source or object of interference surrounded by the interference field so as to cut or weaken the interference field spatial coupling channel to prevent the transmission of electromagnetic energy. According to the nature of the interference field to be shielded, can be divided into electric field shielding, magnetic field shielding and electromagnetic field shielding.
2. Isolation refers to the source of interference with the receiving system to isolate, so that the useful signal is transmitted normally, while the interference coupling channel is cut off to achieve the purpose of suppressing interference. Common isolation methods are photoelectric isolation, transformer isolation and relay isolation and other methods
3. Filtering is an important method of suppressing interference conduction. As the spectrum of electromagnetic interference emitted by the interference source is often much wider than the spectrum of the signal to be received, so when the receiver receives a useful signal, it will also receive those unwanted interference. In this case, a filtering method can be used to allow only the desired frequency components to pass through, while suppressing the interfering frequency components.
4. A low-impedance connection of circuits, equipment housings, etc., to a common **** reference point (earth) as a zero potential is called grounding
Software Measures:
1. The method of identifying useful signals and interfering signals and filtering out interfering signals with software is called software filtering
2. The unused cells of the system memory (RAM and ROM) are used in a particular way to filter out the interference. Filling unused cells of system memory (RAM and ROM) with some kind of restart code instruction as a software "trap" to catch programs that "fly off"
3. Hardware (or software) approach requires the use of monitoring timers to regularly check a program or interface, when more than a certain period of time the system does not check the program or interface, you can identify the system running error (interference occurs), the system can be reset through the software or according to the pre-determined way to run