滤波器设计
您可以使用 DSP System Toolbox™ 函数、App 和模块来设计与分析各种数字 FIR 和 IIR 滤波器。其中一些滤波器包括高级滤波器，如奈奎斯特滤波器、半带滤波器、CIC 滤波器、高级等波纹滤波器和拟线性相位 IIR 滤波器。
设计方法根据滤波器设计设定来计算滤波器系数。某些模块（如 Bandpass IIR Filter Design 和 Bandstop IIR Filter Design）具有可调滤波器设定，因此，您可以在仿真运行时更改滤波器设定并重新设计滤波器。
App
| 滤波器构建工具 | Design filters starting with frequency and magnitude specifications
(filterBuilder) |
实时编辑器任务
| 设计滤波器 | Design a digital filter or implement a System object in the Live Editor (自 R2021b 起) |
函数
对象
模块
主题
- Using Filter Designer
Use Filter Designer as a powerful yet convenient graphical tool to design and analyze filters.
- Design a Filter in Fdesign — Process Overview
Learn how to analyze, design, and implement filters in MATLAB® and Simulink®.
- Filter Builder Design Process
filterBuilderGUI. - Use Filter Designer with DSP System Toolbox Software
Presents a detailed reference covering the fixed-point, multirate, and scaling pages of the Filter Designer App.
- Lowpass FIR Filter Design
This example shows how to design a lowpass FIR filter using
fdesign. - Lowpass Filter Design in MATLAB
This example shows how to design lowpass filters.
- Controlling Design Specifications in Lowpass FIR Design
This example shows how to control the filter order, passband ripple, stopband attenuation, and transition region width of a lowpass FIR filter.
- Minimax FIR Filter Design
This example shows how to use some of the key features of the generalized Remez FIR filter design function.
- Designing Filters with Non-Equiripple Stopband
This example shows how to design lowpass filters with stopbands that are not equiripple.
- 设计并实现滤波器
设计一个数字低通滤波器，并将其纳入到您的模型中，以仿真低频噪声的存在。
- Minimizing Lowpass FIR Filter Length
This example shows how to minimize the number coefficients, by designing minimum-phase or minimum-order filters.
- References — Advanced Filters
Suggested reading and sources for advanced filter design topics.
精选示例
IIR Halfband Stages in Multistage Filter Design
Discusses IIR halfband stages in multistage decimators and interpolators.
Classic IIR Filter Design
Design classic IIR filters. The example initially focuses on the scenario where critical design parameter is the cutoff frequency at which the power of the filter decays to half (–3 dB) the nominal passband value.
Design Peak and Notch Filters
Design peak and notch filters. Filters that peak or notch at a certain frequency retain or eliminate a particular frequency component of a signal. The design parameters that you can set for such filters are the frequency at which you want the peak or notch and the 3-dB bandwidth or the Q factor. Using these specifications and by increasing the filter order, you can design filters that more closely approximate an ideal filter.
Arbitrary Magnitude and Phase Filter Design
Design filters with customized magnitude and phase specifications. Many filter design problems focus on the magnitude response only, while assuming a linear phase response through symmetry. In some cases, however, the desired filter needs to satisfy constraints on both magnitude and phase.
Least Pth-Norm Optimal FIR Filter Design
Design least Pth-norm FIR filters with the firlpnorm function. This function uses a least-Pth unconstrained optimization algorithm to design FIR filters with arbitrary magnitude response.
Least Pth-Norm Optimal IIR Filter Design
Design optimal IIR filters with arbitrary magnitude response using the least-Pth unconstrained optimization algorithm.
FIR Nyquist (L-th band) Filter Design
Design lowpass FIR Nyquist filters. It also compares these filters with raised cosine and square root raised cosine filters. These filters are widely used in pulse-shaping for digital transmission systems. They also find application in interpolation/decimation and filter banks.
Design of Decimators and Interpolators
Design filters for decimation and interpolation of discrete sequences.
IIR Filter Design Given a Prescribed Group Delay
Design arbitrary group delay filters using the designfilt. This designer uses a least-Pth constrained optimization algorithm to design allpass IIR filters that meet a prescribed group delay.
Fractional Delay Filters Using Farrow Structures
Use Farrow structures to design digital fractional delay filters. Digital fractional delay filters are useful tools to fine-tune the sampling instants of signals. They are typically found in the synchronization of digital modems where the delay parameter varies over time. This example illustrates why the Farrow structure is a popular method for implementing time-varying FIR fractional delay filters.
Design Fractional Delay FIR Filters
Design an implementation of fractional delay FIR filters.
