How to use low pass flter for time domine data
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Hello
I need to filter high frequency data and allow only low frequency.
Can I use low pass filter in time domine data to filter noise signal without using FFT to convert data in frequency domine and use a low pass filter then take ifft.
Pls some one help me.
--Thanks
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Youssef Khmou
2013-3-23
hi, you can use built-in functions "butter" and " filter" , example :
Fs=8000; % SAMPLING FREQUENCY
t=0:1/Fs:2;
f1=500; %lower frequency
f2=1500; % upper frequency
y=chirp(t,f1,2,f2); % THE SIGNAL WITH BANDWIDTH 1000 Hz
Fc=1500; % cutoff frequency .
Fn=Fs/2;
% Filter implementation
[b,a]=butter(2,Fc/Fn,'low');
x=filter(b,a,y);
I hope this helps
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