How to make the dynamic spectra?

1 vue (au cours des 30 derniers jours)

Megha le 31 Oct 2018

Can anyone help me reproducing the below figure.

I really have no clear idea what they have done. It seems it is FFT and then spectrogram command.

Still I am very unclear.

Help in this context is most appriciated!

MATLAB Mathematics Fourier Analysis and Filtering

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