FFT with hanning window

Question

Christine 2020-7-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/562544-fft-with-hanning-window

回答： Star Strider 2020-7-10

I've got EEG data that I would like to do a fourier transform. Ideally I would like to perform a fft for each epoch, then average them, but before I can get to that point, I keep getting this error: Undefined operator '.*' for input arguments of type 'struct' for this line: y_HannWnd = x.*hann(N).

Any suggestions?

EEG = pop_loadset('filename', [num2str(SubjectID{i}) '_ICA.set'], 'filepath', [CurrentDirectory 'Kid SL/Resting/Artifact Cleaned']);
x = EEG;                    %electrodes x samples x epochs (40x1024x111)
Fs = 512;              % Sampling rate
N = 1024;                % Length of signal
nfft = 2^nextpow2(N); % Transform length
y_HannWnd = x.*hann(N);            
Ydft_HannWnd = fft(y_HannWnd,nfft)/N