The role of the filter you don't know

Filter 18.432M

Guide: Filter , as its name suggests, is a device that filters waves, but filters are diverse, and each filter has its own function. Today, Xiaobian will take you into the filter you know. The role of the device "this world ~~

First, the role of the filter - - Overview

A filter is a device that filters a wave. It is essentially a frequency selective circuit that allows a signal of a useful frequency to pass smoothly, and blocks the unused frequency signal from passing through it, thereby filtering the frequency. Features. The filtering process is the process of extracting information carried by the original signal from noise-distorted and contaminated signals. The result of filtering is to get a specific frequency or to eliminate a specific frequency.

Second, the role of the filter - - classification

Filters can be classified into low-pass filters, high-pass filters, band-pass filters, and band-stop filters, depending on the frequency of the signal being filtered. All filters can eliminate interference noise, but different types of filters have different effects.

Third, the role of the filter - low pass filter

For a low-pass filter, it allows low-frequency or direct-current components in the signal to pass, while suppressing high-frequency components or interference noise and the like. That is, the high frequency is filtered out and the low frequency is retained.

Fourth, the role of the filter - high pass filter

For a high pass filter, it allows high frequency or alternating current components in the signal to pass, while suppressing low frequency or direct current components. That is, the low frequency is filtered out and the high frequency is retained.

Fifth, the role of the filter - bandpass filter

For a bandpass filter, it allows a signal of a certain frequency band to pass, which is different from the low frequency signal of the low pass filter and the high frequency signal of the high pass filter, which is a signal in a certain frequency band in the middle, Signals, interference, and noise below or above this band are suppressed. It is equivalent to a series connection of high-pass and low-pass, filtering out the high and low, and retaining the middle frequency band.

Sixth, the role of the filter - - band stop filter

For a band-stop filter, it is just opposite to a band-pass filter, suppressing signals in a certain frequency band, and allowing signals outside the band to pass. That is, the middle frequency band is filtered out, and the high and low frequencies are reserved.

Here are some filters recommended by Xiaobian for everyone.