Hello,
I’d like to extract various frequency components (amplitue, frequecny, phase) by applying FFT to a time series. Then to check if I get the correct numbers, reconstruct the time series by summing up the cosine components. As shown in the figure attached, there seems to be a growing time shift. What went wrong in my script? This issue is absent for my another set of data though.

Thank you!Hello,
I’d like to extract various frequency components (amplitue, frequecny, phase) by applying FFT to a time series. Then to check if I get the correct numbers, reconstruct the time series by summing up the cosine components. As shown in the figure attached, there seems to be a growing time shift. What went wrong in my script? This issue is absent for my another set of data though.

Thank you! Hello,
I’d like to extract various frequency components (amplitue, frequecny, phase) by applying FFT to a time series. Then to check if I get the correct numbers, reconstruct the time series by summing up the cosine components. As shown in the figure attached, there seems to be a growing time shift. What went wrong in my script? This issue is absent for my another set of data though.

Thank you! fft, time series, phase shift MATLAB Answers — New Questions

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