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

滤波器分析器	查看、分析和比较滤波器 (自 R2024a 起)
滤波器设计工具	从算法选择开始设计滤波器

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

`cfirpm`	Complex and nonlinear-phase equiripple FIR filter design
`designfilt`	Design digital filter
`fir1`	基于窗函数的 FIR 滤波器设计
`fir2`	基于频率采样的 FIR 滤波器设计
`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`	帕克斯-麦克莱伦最优 FIR 滤波器阶数估计
`gaussdesign`	高斯 FIR 脉冲整形滤波器设计
`intfilt`	Interpolation FIR filter design
`kaiserord`	Kaiser window FIR filter design estimation parameters
`maxflat`	Generalized digital Butterworth filter design
`rcosdesign`	升余弦 FIR 脉冲整形滤波器设计
`sgolay`	Savitzky-Golay filter design

`butter`	巴特沃斯滤波器设计
`buttord`	巴特沃斯滤波器阶数和截止频率
`cheby1`	切比雪夫 I 型滤波器设计
`cheb1ord`	切比雪夫 I 型滤波器阶数
`cheby2`	切比雪夫 II 型滤波器设计
`cheb2ord`	切比雪夫 II 型滤波器阶数
`designfilt`	Design digital filter
`ellip`	椭圆滤波器设计
`ellipord`	椭圆滤波器的最小阶
`yulewalk`	Recursive digital filter design

`digitalFilter`	Digital filter
`double`	Cast coefficients of digital filter to double precision
`filt2block`	Generate Simulink filter block
`filterAnalyzer`	使用滤波器分析器分析滤波器 (自 R2024a 起)
`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
`scaleFilterSections`	Scale cascaded transfer functions with scale values (自 R2023b 起)
`setSampleRate`	Set sample rate of digital filter (自 R2026a 起)
`single`	Cast coefficients of digital filter to single precision

Lowpass FIR	Design lowpass finite impulse response filter
Highpass FIR	Design highpass finite impulse response filter
Bandpass FIR	Design bandpass finite impulse response filter
Bandstop FIR	Design bandstop finite impulse response filter
Differentiator FIR	Design differentiator finite impulse response filter
Hilbert FIR	Design Hilbert finite impulse response filter
Arbitrary Response FIR	Design finite impulse response filter of arbitrary response

Lowpass IIR	Design lowpass infinite impulse response filter
Highpass IIR	Design highpass infinite impulse response filter
Bandpass IIR	Design bandpass infinite impulse response filter
Bandstop IIR	Design bandstop infinite impulse response filter

Use Filter Designer App

Import or create filters, design, inspect, and export filter designs.
- 步骤 1: Import or Create Filters
- 步骤 2: Design Filters
- 步骤 3: Quantize Filters
- 步骤 4: Manage and Analyze Filters
- 步骤 5: Export and Share Filters
IIR 滤波器设计
此示例比较经典的巴特沃斯、切比雪夫和椭圆设计；并探索贝塞尔、尤尔-沃克和广义巴特沃斯滤波器。
FIR 滤波器设计
此示例说明如何使用加窗、最小二乘或帕克斯-麦克莱伦算法来设计低通、高通、多频带或任意响应滤波器、微分器或希尔伯特变换器。
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。
Generate Guitar Chords Using the Karplus-Strong Algorithm
Generate realistic guitar chords using the Karplus-Strong algorithm and discrete-time filters.