can i discretise a transfer function in "butter" toolbox Matlab?

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ADNAN KIRAL 2018-12-6

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评论： ADNAN KIRAL 2018-12-12

采纳的回答： Honglei Chen

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hi,

if I use the following command, does that make sense for discretisation? or i need to use "c2d" toolbox matlab for that ?

can anyone help me with that.

thanks in advance

the code is for :

A high-pass filter with a cut-off frequency of 0.02 Hz

A model whose filter is a first-order lag system (n=1). And Sampling time: 0.01 s;

n=1;
Wn=0.02; %Hz 
% Transfer Function design
[b,a] = butter(n,Wn,'high');    
figure;
freqz(b,a,(2*59400),0.01)

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Honglei Chen 2018-12-6

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Could you explain what you mean by discreization? Using your syntax, the output of butter is already a digital filter so I don't think you need somthing like c2d.

HTH

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Honglei Chen 2018-12-11

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What you show here is the filter esponse, not a filtered signal. To filter a signal x, you will have to do

y = filter(b,a,x)

The output y is in time domain.

HTH

ADNAN KIRAL 2018-12-12

thanks.

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