Butterworth filter in simulink

I need the butterworth filter block in Simulink but I can't find it in my Simulink browser. My professor told me it is part of the "Signal Processing Toolbox" from Matlab.

I verified if I have this toolbox by using the "VER" command.

Why don't I have the butterworth filter in my Simulink?

This gave me the following output:

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MATLAB Version: 7.14.0.739 (R2012a)
MATLAB License Number: ••••••
Operating System: Linux 3.2.0-38-generic-pae #61-Ubuntu SMP Tue Feb 19 12:39:51 UTC 2013 i686
Java Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode
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MATLAB                                                Version 7.14       (R2012a)                     
Simulink                                              Version 7.9        (R2012a)                     
Aerospace Blockset                                    Version 3.9        (R2012a)                     
Aerospace Toolbox                                     Version 2.9        (R2012a)                     
Bioinformatics Toolbox                                Version 4.1        (R2012a)                     
Communications System Toolbox                         Version 5.2        (R2012a)                     
Computer Vision System Toolbox                        Version 5.0        (R2012a)                     
Control System Toolbox                                Version 9.3        (R2012a)                     
Curve Fitting Toolbox                                 Version 3.2.1      (R2012a)                     
DSP System Toolbox                                    Version 8.2        (R2012a)                     
Database Toolbox                                      Version 3.11       (R2012a)                     
Datafeed Toolbox                                      Version 4.3        (R2012a)                     
Econometrics Toolbox                                  Version 2.1        (R2012a)                     
Embedded Coder                                        Version 6.2        (R2012a)                     
Filter Design HDL Coder                               Version 2.9.1      (R2012a)                     
Financial Derivatives Toolbox                         Version 5.9        (R2012a)      License unknown
Financial Toolbox                                     Version 4.2        (R2012a)                     
Fixed-Income Toolbox                                  Version 2.3        (R2012a)      License unknown
Fixed-Point Toolbox                                   Version 3.5        (R2012a)                     
Fuzzy Logic Toolbox                                   Version 2.2.15     (R2012a)                     
Global Optimization Toolbox                           Version 3.2.1      (R2012a)                     
HDL Coder                                             Version 3.0        (R2012a)                     
HDL Verifier                                          Version 4.0        (R2012a)                     
Image Acquisition Toolbox                             Version 4.3        (R2012a)                     
Image Processing Toolbox                              Version 8.0        (R2012a)                     
Instrument Control Toolbox                            Version 3.1        (R2012a)                     
MATLAB Builder JA                                     Version 2.2.4      (R2012a)                     
MATLAB Coder                                          Version 2.2        (R2012a)                     
MATLAB Compiler                                       Version 4.17       (R2012a)                     
MATLAB Report Generator                               Version 3.12       (R2012a)                     
Mapping Toolbox                                       Version 3.5        (R2012a)                     
Model Predictive Control Toolbox                      Version 4.1        (R2012a)                     
Neural Network Toolbox                                Version 7.0.3      (R2012a)                     
Optimization Toolbox                                  Version 6.2        (R2012a)                     
Parallel Computing Toolbox                            Version 6.0        (R2012a)                     
Partial Differential Equation Toolbox                 Version 1.0.20     (R2012a)                     
Phased Array System Toolbox                           Version 1.2        (R2012a)                     
RF Toolbox                                            Version 2.10       (R2012a)                     
Robust Control Toolbox                                Version 4.1        (R2012a)                     
Signal Processing Toolbox                             Version 6.17       (R2012a)                     
SimBiology                                            Version 4.1        (R2012a)                     
SimDriveline                                          Version 2.2        (R2012a)                     
SimElectronics                                        Version 2.1        (R2012a)                     
SimEvents                                             Version 4.1        (R2012a)                     
SimHydraulics                                         Version 1.10.1     (R2012a)                     
SimMechanics                                          Version 4.0        (R2012a)                     
SimPowerSystems                                       Version 5.6        (R2012a)                     
SimRF                                                 Version 3.2        (R2012a)                     
Simscape                                              Version 3.7        (R2012a)                     
Simulink 3D Animation                                 Version 6.1        (R2012a)                     
Simulink Coder                                        Version 8.2        (R2012a)                     
Simulink Control Design                               Version 3.5        (R2012a)                     
Simulink Design Optimization                          Version 2.1        (R2012a)                     
Simulink Design Verifier                              Version 2.2        (R2012a)                     
Simulink Fixed Point                                  Version 7.1        (R2012a)                     
Simulink Report Generator                             Version 3.12       (R2012a)                     
Simulink Verification and Validation                  Version 3.3        (R2012a)                     
Stateflow                                             Version 7.9        (R2012a)                     
Statistics Toolbox                                    Version 8.0        (R2012a)                     
Symbolic Math Toolbox                                 Version 5.8        (R2012a)                     
System Identification Toolbox                         Version 8.0        (R2012a)                     
SystemTest                                            Version 2.6.3      (R2012a)                     
Wavelet Toolbox                                       Version 4.9        (R2012a)

Answer 1

[Azzi Abdelmalek]

There is no block named Butterworth, look at Analog Filter Design block and set it to Butterworth filter

[Wouter]

That I was looking for! Thanks!

[Giuseppe Naselli]

Thanks for you help Azzi useful as always.

In Malb I used to create the filter coefficients using butter() and then apply those to the signal through filtfilt(). As filtfilt() perform forward and backward direction the filtering, this was useful to have a zero-phase shift filter. DO you know if this is possible in Simulink?

Cheers

G

[waad Alzahrani]

i need to design a butterworth first order filter using simulink, since there is no block for butterworts filter so i can use the lowpass filter block or the transfer function right ?

Answer 2

[Shashank Prasanna]

It is indeed in the Signal Processing Toolbox as you can see here:

http://www.mathworks.com/help/signal/ref/butter.html

You can use design digital or analog domain filters and use

Discrete or continuous filters to use it in Simulink:

http://www.mathworks.com/help/simulink/discrete.html

http://www.mathworks.com/help/simulink/continuous.html

Answer 3

[병수 이]

I am using MATLAB R2021a.

The block is in DSP System Toolbox --> Filter Implementations --> Analog Filter Design.

The Analog Filter Design block supports Butterworth, Chevyshev I, Chevyshev II, Elliptic and Bessel filters

for Lowpass, Highpass, Bandpass and Bandstop types with arbitrary orders.