Single-Rate Filters

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

Design and implement FIR and IIR single-rate filters using the various functions, System objects, and blocks in DSP System Toolbox™. These features enable you to filter a streaming signal in MATLAB^® and Simulink^®.

Objects

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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.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
`dsp.MIMOFIRFilter`	Filter input signals through multipath MIMO FIR filter (Since R2024b)

IIR

`dsp.AllpassFilter`	Single section or cascaded allpass filter
`dsp.AllpoleFilter`	IIR Filter with no zeros
`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`	Implement cascade of second order section filters
`dsp.VariableBandwidthIIRFilter`	Variable bandwidth IIR filter

Functions

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FIR

`designLowpassFIR`	Design and implement lowpass FIR filter (Since R2023b)
`designHighpassFIR`	Design and implement highpass FIR filter (Since R2023b)
`designBandpassFIR`	Design and implement bandpass FIR filter (Since R2023b)
`designBandstopFIR`	Design and implement bandstop FIR filter (Since R2023b)
`designHalfbandFIR`	Design and implement halfband FIR filter (Since R2023b)

IIR

`designLowpassIIR`	Design and implement lowpass IIR filter (Since R2023b)
`designHighpassIIR`	Design and implement highpass IIR filter (Since R2023b)
`designBandpassIIR`	Design and implement bandpass IIR filter (Since R2023b)
`designBandstopIIR`	Design and implement bandstop IIR filter (Since R2023b)
`designHalfbandIIR`	Design and implement halfband IIR filter in the form of a coupled allpass filter (Since R2023b)
`designNotchPeakIIR`	Design and implement high-order Butterworth notch or peak IIR filter (Since R2023b)

Blocks

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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
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
MIMO FIR Filter	Filter input signals through multipath MIMO FIR filter (Since R2025a)
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
Fourth-Order Section Filter	Implement cascade of fourth-order section filters (Since R2022a)
Notch-Peak Filter	Design second-order tunable notching and peaking IIR filter
Second-Order Section Filter	Implement cascade of second-order section filters (Since R2023b)
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.
Using Digital Filter Design Block
Create and implement filters using the Digital Filter Design block.
SSB Modulation
Perform SSB modulation in Simulink.
Filter Frames of a Noisy Sine Wave Signal in MATLAB
This example shows how to lowpass filter a noisy signal in MATLAB® and visualize the original and filtered signals using a spectrum analyzer.
Filter Frames of a Noisy Sine Wave Signal in Simulink
This example shows how to lowpass filter a noisy signal in Simulink and visualize the original and filtered signals with a spectrum analyzer.
Tunable Lowpass Filtering of Noisy Input in Simulink
This example shows how to filter a noisy chirp signal with a lowpass filter that has a tunable passband frequency.
Filter Noisy Signal Using Fourth-Order Section (FOS) Filter in Simulink
Filter noisy sinusoidal signal using fourth order section filter in Simulink.
Variable-Size Signal Support DSP System Objects
List of System objects that support variable-sized signals in DSP System Toolbox.

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