Documentation

Single-Rate Filters

FIR, IIR, overlap-add FIR, biquad, lattice, Farrow

Objects

FIR

`dsp.AnalyticSignal`	Analytic signals of discrete-time inputs
`dsp.Differentiator`	Direct form FIR fullband differentiator filter
`dsp.FIRFilter`	Static or time-varying FIR filter
`dsp.HDLFIRFilter`	Finite impulse response filter—optimized for HDL code generation
`dsp.HampelFilter`	Filter outliers using Hampel identifier
`dsp.HighpassFilter`	FIR or IIR highpass filter
`dsp.LowpassFilter`	FIR or IIR lowpass filter
`dsp.MedianFilter`	Median filter
`dsp.VariableBandwidthFIRFilter`	Variable bandwidth FIR filter
`dsp.FrequencyDomainFIRFilter`	Filter input signal in frequency domain

IIR

`dsp.AllpassFilter`	Single section or cascaded allpass filter
`dsp.AllpoleFilter`	IIR Filter with no zeros
`dsp.BiquadFilter`	IIR filter using biquadratic structures
`dsp.CoupledAllpassFilter`	Coupled allpass IIR filter
`dsp.FourthOrderSectionFilter`	Implement cascade of fourth-order section filter
`dsp.HighpassFilter`	FIR or IIR highpass filter
`dsp.IIRFilter`	Infinite impulse response (IIR) filter
`dsp.LowpassFilter`	FIR or IIR lowpass filter
`dsp.NotchPeakFilter`	Second-order tunable notching and peaking IIR filter
`dsp.SOSFilter`	Second-order section biquadratic IIR filter structures
`dsp.VariableBandwidthIIRFilter`	Variable bandwidth IIR filter

Functions

dfilt Methods

`filter`	1-D digital filter
`convert`	Convert filter structure of discrete-time filter
`sysobj`	Create filter System object from discrete-time filter

FIR dfilts

`dfilt.delay`	Delay filter
`dfilt.dffir`	Discrete-time, direct-form FIR filter
`dfilt.dffirt`	Discrete-time, direct-form FIR transposed filter
`dfilt.dfsymfir`	Discrete-time, direct-form symmetric FIR filter
`dfilt.dfasymfir`	Discrete-time, direct-form antisymmetric FIR filter
`dfilt.farrowlinearfd`	Farrow Linear Fractional Delay filter
`dfilt.farrowfd`	Fractional Delay Farrow filter
`dfilt.fftfir`	Discrete-time, overlap-add, FIR filter
`dfilt.latticemamax`	Discrete-time, lattice, moving-average filter with maximum phase
`dfilt.latticemamin`	Discrete-time, lattice, moving-average filter with minimum phase
`dfilt.scalar`	Discrete-time, scalar filter

IIR dfilts

`dfilt.allpass`	Allpass filter
`dfilt.calattice`	Coupled-allpass, lattice filter
`dfilt.calatticepc`	Coupled-allpass, power-complementary lattice filter
`dfilt.df1`	Discrete-time, direct-form I filter
`dfilt.df1sos`	Discrete-time, SOS direct-form I filter
`dfilt.df1t`	Discrete-time, direct-form I transposed filter
`dfilt.df1tsos`	Discrete-time, SOS direct-form I transposed filter
`dfilt.df2`	Discrete-time, direct-form II filter
`dfilt.df2sos`	Discrete-time, SOS, direct-form II filter
`dfilt.df2t`	Discrete-time, direct-form II transposed filter
`dfilt.df2tsos`	Discrete-time, SOS direct-form II transposed filter
`dfilt.latticeallpass`	Discrete-time, lattice allpass filter
`dfilt.latticear`	Discrete-time, lattice, autoregressive filter
`dfilt.latticearma`	Discrete-time, lattice, autoregressive, moving-average filter
`dfilt.wdfallpass`	Wave digital allpass filter

Multistage dfilts

`dfilt.cascade`	Cascade of discrete-time filters
`dfilt.parallel`	Discrete-time, parallel structure filter
`dfilt.cascadeallpass`	Cascade of allpass discrete-time filters
`dfilt.cascadewdfallpass`	Cascade allpass WDF filters to construct allpass WDF

Blocks

FIR

Analytic Signal	Compute analytic signals of discrete-time inputs
Differentiator Filter	Direct form FIR fullband differentiator filter
Discrete Filter	Model Infinite Impulse Response (IIR) filters
Discrete FIR Filter	Model FIR filters
Discrete FIR Filter HDL Optimized	Finite impulse response filter—optimized for HDL code generation
Frequency-Domain FIR Filter	Filter input signal in the frequency domain
Hampel Filter	Filter outliers using Hampel identifier
Highpass Filter	Design FIR or IIR highpass filter
Lowpass Filter	Design FIR or IIR lowpass filter
Median Filter	Median filter
Variable Bandwidth FIR Filter	Design tunable bandwidth FIR filter

IIR

Allpass Filter	Single-section or multiple-section allpass filter
Allpole Filter	Model allpole filters
Biquad Filter	Model biquadratic IIR (SOS) filters
Notch-Peak Filter	Design second-order tunable notching and peaking IIR filter
Variable Bandwidth IIR Filter	Design tunable bandwidth IIR filter

Topics

Removing High-Frequency Noise from an ECG Signal

This example shows how to lowpass filter an ECG signal that contains high frequency noise.

Remove High-Frequency Noise from Gyroscope Data

Remove high-frequency noise using a median filter.

Design a Filter in Fdesign — Process Overview

Learn how to analyze, design, and implement filters in MATLAB^® and Simulink^®.

Filter Builder Design Process

filterBuilder GUI.

Digital Filter Implementations

Implement your filter design using the DSP System Toolbox filter blocks.

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.

Compare Single-Rate/Single-Stage Filters with Multirate/Multistage Filters

Shows the efficiency gains that are possible when using multirate and multistage filters for certain applications.

Digital Filter Design Block

Create and implement filters using the Digital Filter Design block.

Filter Realization Wizard

Create and implement filters using the Filter Realization Wizard block.

Variable-Size Signal Support DSP System Objects

List of System objects which support variable-sized signals in DSP System Toolbox™.

Featured Examples

Parametric Audio Equalizer

Parametric Audio Equalizer

Model an algorithm specification for a three band parametric equalizer

DSP System Toolbox Documentation

Support