eeg filter using matlab

[caleigh]

eeg fiter

my task ask to write an algorithm for filtering random noise for eeg signal..

i want to do butterworth, bandpass filter...can any body help me...



and one more thing...can anybody explain this algorithm one by one....and how to improve the filter?

please...i'm new to matlab...


v=.01
f=100;
fs=5000;
t=0:1/fs:.03
x=sin(2*pi*f*t);
figure (1)
plot (x);title ('original signal')

r=sqrt(v)*randn(1,length(t));
figure (2)
plot (r); title ('noise')

Xw=x+r;%signal plus noise (filter input)

figure(3)
plot(Xw);title('mix')

for n= 3:length(Xw),
y=(Xw+(Xw(n-1))+(Xw(n-2)))/3;

figure(4)
plot;title ('final')
hold;

figure (5)
plot(x,'r'); title ('original signal')