滤波器分析

可视化滤波器的频率响应，验证滤波器的属性和特征

DSP System Toolbox™ 为您提供多种滤波器分析功能，用于验证滤波器设计设定。您可以使用这些功能来可视化各种滤波器响应，如幅值、相位、冲激和阶跃响应。您还可以使用 coeffs、cost 和 info 等函数来确定滤波器属性，并使用 firtype、isfir 和 isstable 等函数来验证滤波器特征。有关 DSP System Toolbox 提供的所有分析函数的完整列表，请参阅 Analysis Functions for Filter System Objects。

您还可以使用 MATLAB^® 中的 dsp.DynamicFilterVisualizer 对象和 Simulink^® 中的 Filter Visualizer 模块来可视化时变数字滤波器的幅值和相位响应。有关详细信息，请参阅Configure Filter Visualizer。

App

滤波器分析器

查看、分析和比较滤波器 (自 R2024a 起)

函数

全部展开

滤波器设计和可视化工具

`dsp.DynamicFilterVisualizer`	Display time-varying magnitude and phase response of digital filters
`filterAnalyzer`	Analyze filters with Filter Analyzer app (自 R2024a 起)

滤波器响应特征

`freqrespest`	Frequency response estimate via filtering
`freqrespopts`	Create an options object for frequency response estimate
`freqz`	离散时间滤波器 System object 的频率响应
`freqzmr`	Compute DTFT approximation of impulse response of multirate or single-rate filter (自 R2024a 起)
`grpdelay`	Group delay response of discrete-time filter System object
`impz`	离散时间滤波器 System object 的冲激响应
`impzlength`	Length of impulse response of discrete-time filter System object
`measure`	Measure frequency response characteristics of filter System object
`noisepsd`	Power spectral density of filter output due to round-off noise
`noisepsdopts`	Create an options object for output noise PSD computation
`outputDelay`	Determine output delay of single-rate or multirate filter (自 R2022a 起)
`phasedelay`	Phase delay response of discrete-time filter System object
`phasez`	Phase response of discrete-time filter System object (unwrapped)
`stepz`	Step response of discrete-time filter System object
`zerophase`	Zero-phase response of discrete-time filter System object
`zplane`	离散时间滤波器 System object 的 Z 平面零极点图

滤波器属性

`coeffs`	以结构体形式返回滤波器 System object 系数
`cost`	估计实现滤波器 System object 的成本
`cumsec`	Cumulative second-order section of the biquadratic filter
`disp`	显示滤波器属性和值
`filtstates.cic`	Store CIC filter states
`info`	Information about filter System object
`order`	离散时间滤波器 System object 的阶数
`reset`	重置 System object 的内部状态
`setInputSampleRate`	Specify input sample rate in filter objects (自 R2026a 起)
`ss`	将离散时间滤波器 System object 转换为状态空间表示
`tf`	将离散时间滤波器 System object 转换为传递函数
`zpk`	离散时间滤波器 System object 的零极点增益转换

检查滤波器特性

`firtype`	Determine type (1-4) of linear phase FIR filter System object
`isallpass`	Verify that discrete-time filter System object is allpass
`isfir`	Verify if filter System object is FIR
`islinphase`	Verify that discrete-time filter System object is linear phase
`ismaxphase`	Verify that discrete-time filter System object is maximum phase
`isminphase`	Verify that discrete-time filter System object is minimum phase
`isreal`	Verify that discrete-time filter System object is real
`issos`	Verify if discrete-time System object filter is in second-order sections form
`isstable`	Verify that discrete-time filter System object is stable
`scalecheck`	Check scaling of biquadratic filter

滤波器实现

`realizemdl`	Simulink subsystem block for filter
`realizeModel`	Create Simulink block equivalent of CIC rate conversion filter objects (自 R2024a 起)

变换滤波器系数

`allpass2wdf`	Allpass to Wave Digital Filter coefficient transformation
`normalizefreq`	Switch filter specification between normalized frequency and absolute frequency
`wdf2allpass`	Wave Digital Filter to allpass coefficient transformation

对象

filterAnalyzer Analyze filters with Filter Analyzer app (自 R2024a 起)

模块

Filter Visualizer

Display magnitude and phase response of time-varying digital filters (自 R2023a 起)

主题

Use Filter Analyzer App

Import or create filters, design, inspect, and export filter designs.
- 步骤 1: Import Filters and Manage Sessions
- 步骤 2: Manage and Analyze Filters
Analysis Functions for Filter System Objects
List of all the analysis functions for filter System objects.
Configure Filter Visualizer
Customize Filter Visualizer properties and use measurement tools.
Time Delay and Scaling in Multirate DSP Filters
Effect of time delay and scaling in multirate filters. Use outputDelay function to calculate the time delay and scaling.