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Discussion Groups | Matlab DSP | filters

Technical discussion about Matlab and issues related to Digital Signal Processing.

  

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filters - dean_cvetkovic - Sep 22 12:50:00 2003



Hi all,

To be honest, I'm a DSP beginner.
I'm currently trying to filter 4 channel signals. However, I find it
difficult to get the plot for filtered signals.

Can somebody help me fix this problem. The code is shown below.

Thank you in advance.

Dean

---------------------------------------
load A1.txt for i=1:4
figure(1);
subplot(4,1,i)
plot(A1(:,i))
axis([0 60000 -1 1])
xlabel('time,sec')
ylabel('amplitude,V')

figure(2);
ord=30; %order of bandpass filters
%Create Low Pass Smoothing Filter
lp=fir1(100,.005);

%Filter Delta Range
drange=[.005 .04];
dfilt=fir1(ord,drange);
dsig=abs(conv(A1(:,1),dfilt)); %Convolve signal with BP filter.
dlpsig=conv(dsig(:,1),lp); %Convolve with low pass filter to
smooth.
figure(2); subplot(4,1,i); plot(dlpsig(A1(:,1))); axis([0 60000 -
1 1]);

end
-----------------------------------------------------




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