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What are the types of filters
Sep 05,2025
Filters can be mainly divided into five basic types (low-pass, high pass, band-pass, bandstop, all pass). If classified by signal processing methods, they can be divided into analog and digital filters. If classified by design methods, they include Butterworth, Chebyshev, and other types.
Classified by frequency characteristics
Low pass filter (LPF): allows signals below the cutoff frequency to pass through, suppresses high-frequency signals, and is commonly used for power supply denoising and anti-interference.
High pass filter (HPF): allows high-frequency signals to pass through, suppresses low-frequency or DC components, and is suitable for eliminating 50Hz power interference or audio processing.
Band pass filter (BPF): Only allows signals in specific frequency bands to pass through, implemented by a series of low-pass and high pass filters, commonly used in communication systems.
Band stop filter (BSF): Suppresses signals in specific frequency bands (such as notch filters), allowing other frequency bands to pass through, and is often used to eliminate harmonic interference.
All pass filter (APF): It does not attenuate the amplitude of all frequency signals, only adjusts the phase, and is used for phase correction.
Classified by signal processing method
Analog filters: Processing continuous signals through resistors, capacitors, inductors, and other components, divided into two categories: passive (composed of RLC) and active (including operational amplifiers).
Digital filter: Processing discrete signals through algorithms, including FIR (Finite Impulse Response) and IIR (Infinite Impulse Response).
Classified by design method
Butterworth filter: The passband amplitude response is the flattest and the transition band is wider.
Chebyshev filter: There are equal ripple characteristics in the passband or stopband, and the transition band is steeper.
Elliptical filter: Both the passband and stopband have ripples, but the transition band is steepest.
Bessel filter: with the best phase response linearity, suitable for waveform preservation scenarios.
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