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March 26, 2025
The function of a network filter is to allow signals of a certain frequency to pass smoothly, while signals of another frequency are greatly suppressed. It is essentially a frequency selection circuit. In a network filter, the frequency range that a signal can pass through is called the passband or passband; On the contrary, the frequency range where the signal is greatly attenuated or completely suppressed is called the stopband; The boundary frequency between the passband and stopband is called the cutoff frequency; The voltage gain of an ideal filter is constant within the passband and zero within the stopband; There is a transition band within a certain frequency range between the passband and stopband of an actual filter. Network filters are divided into two types based on the signals they process: analog filters and digital filters; Divided into four types based on the frequency band of the passed signal: low-pass, high pass, band-pass, and bandstop filters; Divided into passive and active filters based on the components used
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