Filtering in Matlab

Question

I have EGG data regarding brain waves but want to filter it so it only shows a certain frequency (for example: alpha) how is this possible in Matlab?

I understand it may be best to use a bandpass filter, if so could you elaborate what this means?

You can use a [Butterworth band-pass filter](https://es.mathworks.com/help/signal/ref/butter.html) for example — Luis Mendo, Nov 17 '16 at 22:11

score 1 · Answer 1 · edited May 23 '17 at 10:32

Using a Fast Fourrier Transform you can choose yourself the frequency you'd like (see explanations) :

Fs = 1000;            % Sampling frequency
T = 1/Fs;             % Sampling period
L = 1000;             % Length of signal
t = (0:L-1)*T;        % Time vector
S = 0.7*sin(2*pi*50*t) + sin(2*pi*120*t);
X = S + 2*randn(size(t));
Y = fft(X);

Also as you mentionned see the filters -> Filter Designer

Filtering in Matlab

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