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词汇 Finite impulse response
分类 英语词汇 英语翻译词典
释义

Finite impulse response

中文百科

有限冲激响应

有限冲激响应（Finite impulse response，缩写 FIR）滤波器是数字滤波器的一种，简称FIR数字滤波器。这类滤波器对于脉冲输入信号的响应最终趋向于0，因此是有限的，而得名。它是相对于无限冲激响应（IIR）滤波器而言。由于无限冲激响应滤波器中存在反馈回路，因此对于脉冲输入信号的响应是无限延续的。

英语百科

Finite impulse response 有限冲激响应

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
Fig. (b) Pole–zero diagram

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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