Hi Rechu. I have a lot of signal processing teaching material linked on my website (mikexcohen.com), including 50+ hours of youtube lectures on time-frequency analysis, books, online courses on the Fourier transform and spectral analysis, and so on. Perhaps you will find some of those resources useful.

Mike

While taking FFT, you can keep the phase information

https://www.mathworks.com/matlabcentral/answers/275358-how-to-determine-phase-of-a-sine-wave-using-fft

If you want to perform a time-frequency analysis, you should use wavelet or STFT. If you use STFT, you can obtain phase information.

Hi Rechu

I recommend you to explain the aim that you are pursuing in your analysis in more detail. Also, what platform are you using?

I would recommend you to familiarize yourself with the FieldTrip toolbox. There you will find great tutorials for any kind of EEG analysis:

http://www.fieldtriptoolbox.org/

If you have a more specific question, the community here may be able to help you.

Best

Julian

Hi Rechu. I have a lot of signal processing teaching material linked on my website (mikexcohen.com), including 50+ hours of youtube lectures on time-frequency analysis, books, online courses on the Fourier transform and spectral analysis, and so on. Perhaps you will find some of those resources useful.

Mike

I suggest checking that the pre-amp and amplifiers do not intro frequency dependent phase shifts before filtering and transforming the EEG signal - a potential problem with feedback controlled operational amplifiers. Seems synchronized sine signals would show what happens. I also think that measuring the impulse response function of the amplifiers would be another test, but I am uncertain about the math.