Finite impulse response

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−1 operator in Z-transform notation.

A lattice-form discrete-time FIR filter of order N. Each unit delay is a z−1 operator in Z-transform notation.

Fig. (a) Block diagram of a simple FIR filter (2nd-order/3-tap filter in this case, implementing a moving average)Fig. (b) Pole–zero diagram of a second-order FIR filterFig. (c) Magnitude and phase responsesFig. (d) Amplitude and phase responses

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).

单词	Finite impulse response filter
释义	Finite impulse response filter 英语百科 Finite impulse response 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).
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Finite impulse response filter

Finite impulse response