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% signal length
N = length(x);

% time vector
t = (0:N-1)/fs;

% remove the DC component
x = x - mean(x);

% PSD (Power Spectral Density ,Vrms^2/Hz)
% [PSD,F] = PWELCH(X,WINDOW,NOVERLAP,NFFT,Fs)
win = hanning(512, 'periodic');
[PSD, f] = pwelch(x, win, 256, N, fs, 'onesided');
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