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Butterworth bandpass filter on a signal

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Hafiz Ahmad
Hafiz Ahmad 2017-10-28
评论： Sankar Ram T 2018-8-3
I need to process a signal. I have fixed the zero offset but now I need to run it through a butterworth bandpass filter. I have went through the guide on how to do it but I'm still unclear on how to do it and what should be done. Can anyone show me how this could be done? and what variables are needed to perform this?
This is how the signal looks like:
clf;
A = importdata('A-scan.txt');
As = detrend(A,0); %remove zero offset
% Design and apply the bandpass filter (not working yet)
order = ;
fcutlow = ;
fcuthigh = ;
[b,a] = butter(order,[fcutlow,fcuthigh]/(fs/2), 'bandpass');
x = filter(b,a,A);
plot(x,'k');
  3 个评论
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Hafiz Ahmad
Hafiz Ahmad 2018-8-2
It works! You can design the filter with the details you just mentioned.
Sankar Ram T
Sankar Ram T 2018-8-3
Can you share the final code you used? I am not an electronics person and have no experience in signal processing.
I am finding it quite hard to understand and implement a filter.

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回答（1 个）

Filipe Braganca
Filipe Braganca 2018-8-2
Have you tried using the FIlter Designer app? Type in your command window >> filterDesigner
Also see: https://nl.mathworks.com/help/signal/ug/getting-started-with-filter-designer.html

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