数字滤波器设计

FIR、IIR、加窗、等波纹、最小二乘、Butterworth、Chebyshev、椭圆、脉冲整形

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使用一组设定 (designfilt) 或设计算法（butter、fir1）作为起点设计数字滤波器。生成 FIR 微分器和 Hilbert 滤波器。

APP

滤波器设计工具	Design filters starting with algorithm selection

实时编辑器任务

设计滤波器	Design a digital filter in the Live Editor

函数

IIR滤波器

butter	Butterworth filter design
buttord	Butterworth filter order and cutoff frequency
cheby1	Chebyshev Type I filter design
cheb1ord	Chebyshev Type I filter order
cheby2	Chebyshev Type II filter design
cheb2ord	Chebyshev Type II filter order
designfilt	Design digital filters
ellip	Elliptic filter design
ellipord	Minimum order for elliptic filters
yulewalk	Recursive digital filter design

FIR滤波器

cfirpm	Complex and nonlinear-phase equiripple FIR filter design
designfilt	Design digital filters
fir1	Window-based FIR filter design
fir2	Frequency sampling-based FIR filter design
fircls	Constrained-least-squares FIR multiband filter design
fircls1	Constrained-least-squares linear-phase FIR lowpass and highpass filter design
firls	Least-squares linear-phase FIR filter design
firpm	Parks-McClellan optimal FIR filter design
firpmord	Parks-McClellan optimal FIR filter order estimation
gaussdesign	Gaussian FIR pulse-shaping filter design
intfilt	Interpolation FIR filter design
kaiserord	Kaiser window FIR filter design estimation parameters
maxflat	Generalized digital Butterworth filter design
rcosdesign	Raised cosine FIR pulse-shaping filter design
sgolay	Savitzky-Golay filter design

滤波器实用工具

digitalFilter	Digital filter
double Cast	coefficients of digital filter to double precision
dspfwiz	Create Simulink filter block using Realize Model panel
filt2block	Generate Simulink filter block
info	Information about digital filter
isdouble	Determine if digital filter coefficients are double precision
issingle	Determine if digital filter coefficients are single precision
polyscale	Scale roots of polynomial
polystab	Stabilize polynomial
single	Cast coefficients of digital filter to single precision

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主题

IIR 滤波器设计

• 比较经典 Butterworth、Chebyshev 和椭圆滤波器设计。了解 Bessel 滤波器、Yule-Walker 滤波器和广义 Butterworth 滤波器。

FIR 滤波器设计

• 使用加窗、最小二乘或 Parks-McClellan 算法来设计低通、高通、多频带或任意响应滤波器、微分器或 Hilbert 变换器。

滤波器实现

• 使用 filter 函数对信号进行滤波。

Anti-Causal, Zero-Phase Filter Implementation

• Eliminate the phase distortion introduced by an IIR filter.

补偿 FIR 滤波器引入的延迟

• 使用索引来抵消滤波引入的时移。

补偿 IIR 滤波器引入的延迟

• 当使相位信息保持原样至关重要时，请去除滤波引入的延迟和失真。

取信号的导数

• 使用微分滤波器在不放大噪声的情况下对信号进行求导。

Filter Builder Design Process

• filterBuilder is a graphical interface that speeds up the filter design process.

Generating Guitar Chords Using the Karplus-Strong Algorithm

• Generate realistic guitar chords using the Karplus-Strong algorithm and discrete-time filters.