数字滤波器设计

FIR、IIR、加窗、等波纹、最小二乘、巴特沃斯、切比雪夫、椭圆、脉冲整形

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 微分器和希尔伯特滤波器。

App

Design filters starting with algorithm selection

Design a digital filter in the Live Editor （自 R2021b 起）

`butter`	巴特沃斯滤波器设计
`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

`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

`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

Filter Visualization Tool

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.