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What (who) is FIR filter - definition
![A direct form discrete-time FIR filter of order ''N''. The top part is an ''N''-stage delay line with ''N'' + 1 taps. Each unit delay is a ''z''<sup>−1</sup> operator in [[Z-transform]] notation.](https://commons.wikimedia.org/wiki/Special:FilePath/FIR Filter.svg?width=200 "A direct form discrete-time FIR filter of order ''N''. The top part is an ''N''-stage delay line with ''N'' + 1 taps. Each unit delay is a ''z''<sup>−1</sup> operator in [[Z-transform]] notation.")
![A lattice-form discrete-time FIR filter of order ''N''. Each unit delay is a ''z''<sup>−1</sup> operator in [[Z-transform]] notation.](https://commons.wikimedia.org/wiki/Special:FilePath/FIR Lattice Filter.png?width=200 "A lattice-form discrete-time FIR filter of order ''N''. Each unit delay is a ''z''<sup>−1</sup> operator in [[Z-transform]] notation.")
![The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.](https://commons.wikimedia.org/wiki/Special:FilePath/80a comparison.jpg?width=200 "The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.")
![The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named "LOMO". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.](https://commons.wikimedia.org/wiki/Special:FilePath/Verblühende Sauerkirsche.jpg?width=200 "The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named \"LOMO\". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.")
Wikipedia
In signal processing, a finite impulse response (FIR) filter is a filter whose impulse response (or response to any finite length input) is of finite duration, because it settles to zero in finite time. This is in contrast to infinite impulse response (IIR) filters, which may have internal feedback and may continue to respond indefinitely (usually decaying).
The impulse response (that is, the output in response to a Kronecker delta input) of an Nth-order discrete-time FIR filter lasts exactly samples (from first nonzero element through last nonzero element) before it then settles to zero.
FIR filters can be discrete-time or continuous-time, and digital or analog.
