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Filter principle - classification
Sep 06, 2018

Filter principle - classification


The filter is divided into analog filter and digital filter according to whether the signal processed is analog or digital. The analog filter is used to filter the analog signal, while the digital filter is used to filter the digital signal.


The filter can be divided into low pass filter, high pass filter, band pass filter and band stop filter. The low-pass filter the low frequency signal or dc component is only allowed through (suppress the high frequency component, interference and noise), high-pass filter the high frequency component is only allowed through (suppress low frequency component, dc component), band-pass filter only within a certain frequency band signals will be allowed to pass (inhibit the spectrum of the signal, interference and noise), band-stop filter only allowed outside of a certain frequency band signals through (inhibit the spectrum signal).


The filter can be divided into active filter and passive filter. Among them, the active filter is composed of passive components and active components, while the passive filter is composed of passive components only, without dc power supply.


The filter can be divided into panel filter and panel filter according to its placement. The onboard filter is installed on the circuit board, while the panel filter is installed on the metal panel of the shielding case


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