Clear Filters
Clear Filters

I have a raw eeg data and i want to plot the alpha wave(8-12Hz) of this data in the same window . How can i do? please help me

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(name file of eeg raw data is 'data' just have 1 channel)

Accepted Answer

Star Strider
Star Strider on 2 Dec 2022
Design a bandpass filter (using bandpass or other appropriate function), filter the signal, and plot it —
Fs = 1000;
L = 1E+4;
t = linspace(0, L-1, L)/Fs;
EEG = randn(size(t));
EEGfilt = bandpass(EEG, [8 12], Fs, 'ImpulseResponse','iir');
figure
plot(t, EEG, 'DisplayName','Unfiltered')
hold on
plot(t, EEGfilt, 'DisplayName','Filtered')
hold off
grid
legend('Location','best')
Make sppropriate changes to get the desired result.
.
  10 Comments
vo
vo on 15 Dec 2022
hi @Star Strider Can you help me one more?
I wonder if I use function bandpass, Do I need a step denoise a signal before, or not?
Star Strider
Star Strider on 15 Dec 2022
I do not understand ‘step denoise a signal’. I would just filter the signal with the bandpass function. There is no specific need to do any other processing on it before filtering it. If you want to do further processing on it afterwards, then it is appropriate to do that on the filtered signal. One such approach could be to remove broadband noise (that no frequency selective filter is capable of completely removing). I do not have your EEG signals, so I cannot determine if that is necessary. (The easiest approach to that problem would be to use the sgolayfilt function.)

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