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What (who) is finite impulse response 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.")
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.
