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

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ADNAN KIRAL
ADNAN KIRAL 2018-12-6
评论： ADNAN KIRAL 2018-12-12
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
Honglei Chen 2018-12-6
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
Honglei Chen 2018-12-11
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

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