MATLAB: Matlab filter into simulink filter

butterfdesignlowpass filtersimulink

I have a filter like this:

dd= fdesign.lowpass('Fp,Fst,Ap,Ast',2000/50e3,2500/50e3,1,25);
%designmethods(d);
d_LPF = design(dd,'butter');
%fvtool(d_LPF)
data_LPF=filter(d_LPF,data_hil_abs);

How do I obtain same thing in simulink?

Best Answer

You can consider using

realizemdl(d_LPF)

and then pass the signal through the generated filter. The doc can be found at

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

HTH

Related Solutions

MATLAB: Filter

Code:

   dt = 0.001;         % sampling time (seconds per sample)
   Fs = 1/dt;          % sampling rate (samples per second)
   Fnyq = Fs/2;        % Nyquist frequency (hertz)
   Fco = fm + bw;      % Cut-off frequency (hertz)
   wn = Fco/Fnyq;      % Normalized cut-off (dimensionless)

Explanation:

dt is the sampling time (in seconds per sample)
Fs is the sampling rate (in samples per second)
Fnyq is the Nyquist frequency (in hertz)
Fco is the cutoff frequency (in hertz)
bw = bandwidth (in hertz)
Fc is not needed to compute wn

You should make sure that the following conditions are true:

   bw << fm << fc

and

   bw << fm << Fs

HTH.

Rick

MATLAB: Fir and iir filtering

You have to know your filter specifications. If you do, you can do both with fdesign.lowpass and fdesign.highpass

fdesign.lowpass and fdesign.highpass have different specification strings which support different filter designs.

The default string 'Fp,Fst,Ap,Ast' supports both FIR and IIR designs.

Here is an example:

Design a lowpass filter with a passband frequency of 1 kHz, a stopband frequency of 1.5 kHz, passband ripple of 0.5 dB, and stopband attenuation of 40 dB. The sampling frequency is 20 kHz

   d = fdesign.lowpass('Fp,Fst,Ap,Ast',1e3,1.5e3,0.5,40,20e3);
   designmethods(d)  %shows which designs are valid for this spec
   Hdeq = design(d,'equiripple'); % FIR filter
   Hbutt = design(d,'butter'); %IIR design

Best Answer

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MATLAB: Filter

MATLAB: Fir and iir filtering

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