Time： 2019-03-08 11:34:59
The filter has a passive filter and an active filter; how do the passive and active filters differ? Here are a few ways to teach you:
1. The active filter cancels it after detecting a certain set of harmonic times, and the passive filter forms a harmonic channel to absorb harmonics through the cooperation of the reactor and the capacitor;
2. The active filter is electronic and the passive filter is mechanical;
3, the use of passive filters because of the capacitor
The filter also has points:
1. Low pass filter
From 0 to f2, the amplitude-frequency characteristic is flat, which allows the frequency components below the f2 in the signal to pass almost without attenuation, while the frequency components above f2 are greatly attenuated.
2. Band stop filter
In contrast to bandpass filtering, the stopband is between frequencies f1 to f2. It attenuates the frequency components of the signal above f1 and below f2, and the signals of the remaining frequency components pass almost without attenuation.
3. Bandpass filter
Its passband is between f1 and f2. It allows the frequency components of the signal above f1 and below f2 to pass without attenuation, while the other components are attenuated.
4. High pass filter
In contrast to low-pass filtering, the amplitude-frequency characteristics are straight from the frequency f1 to ∞. It allows the frequency components above the f1 in the signal to pass almost without attenuation, while the frequency components below f1 are greatly attenuated.
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