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
| 滤波器设计工具 | Design filters by choosing algorithm or specifying constraints |
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
滤波器响应
模块
主题
- 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
- Design a Filter in Fdesign — Process Overview
Learn how to analyze, design, and implement filters in MATLAB® and Simulink®.
- Lowpass FIR Filter Design
This example shows how to design a lowpass FIR filter using
fdesign. - MATLAB 中的低通滤波器设计
此示例说明如何设计低通滤波器。该示例重点介绍 DSP System Toolbox™ 中最常用的一些命令行工具。有关更多设计选项，请参阅Design Lowpass FIR 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.
- Minimizing Lowpass FIR Filter Length
This example shows how to minimize the number coefficients, by designing minimum-phase or minimum-order filters.
- 参考资料 - 高级滤波器
建议的关于高级滤波器设计主题的阅读资料和资源。
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.
设计峰值滤波器和陷波滤波器
此示例说明如何设计峰值滤波器和陷波滤波器。在特定频率处产生峰值或陷波的滤波器会保留或消除信号的特定频率分量。您可以为此类滤波器设置的设计参数是您需要找到峰值或陷波的频率以及 3-dB 带宽或 Q 因子。使用这些设定并通过增大滤波器阶数，您可以设计出更接近理想滤波器的滤波器。
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.
使用法罗结构的小数延迟滤波器
此示例说明如何使用法罗结构设计数字小数延迟滤波器。数字小数延迟滤波器是微调信号采样时刻的有用工具。它们通常出现在数字调制解调器的同步中，其中延迟参数随时间变化。此示例说明为什么法罗结构是实现时变 FIR 小数延迟滤波器的流行方法。
Design Fractional Delay FIR Filters
Design an implementation of fractional delay FIR filters.
