What is Filter (electronics)?
[[File:75 Hz HPF on Smaart.jpg|thumb|Frequency response of hi-pass filter]] '''Electronic filters''' are [[electrical circuit]]s which perform [[signal processing]] functions, specifically to remove unwanted frequency components from the signal, to enhance wanted ones, or both. Electronic filters can be: [[File:Capdivider.svg|thumb|75px|left|low-pass filter.]] *[[passive component|passive]] or [[active filter|active]] *[[analog circuit|analog]] or [[digital filter|digital]] *[[high-pass filter|high-pass]], [[low-pass filter|low-pass]], [[band-pass filter|bandpass]], [[band-stop filter|band-reject]] (band reject; notch), or [[all-pass filter|all-pass]]. *[[discrete-time]] (sampled) or [[Continuous signal|continuous-time]] *[[linear filter|linear]] or [[non-linear filter|non-linear]] *[[infinite impulse response]] (IIR type) or [[finite impulse response]] (FIR type) The most common types of electronic filters are [[linear filters]], regardless of other aspects of their design. Digital filters use a [[Fourier transform]]. [[Category:Electronic circuits]] {{tech-stub}}