ניתוח אותות פיזיולוגיים

I will send 4 .CSV files taken with 4 different subjects. Each one including Pressure, Respiration, ECG and PPG traces at 500Hz, 16Bits. Sample file enclosed

We need a quick and dirty evaluation, where you generate two plots for each subject, showing the FFT intensity at the heart frequency for the Pressure and PPG channels as a function of time. Heart frequency may change during the recording, so its average must be calculated for each window separately (probably easiest from the ECG trace).
FFT should be calculated over 4 seconds windows (4-5 beats), sliding at 2 seconds from one another (i.e. 0-4, 2-6 seconds… etc) over the entire recording.