How I can filter these data pressure?

I need to remove noise

[Walter Roberson]

The noise is polyphasic hypergeometric with nu = 7/2 and z = 0.7384519, sum of 11 terms, right ?

Answer 1

[Star Strider]

You first need to do a Fourier transform on your signal to see the frequency content of it. See the R2015a documentation for fft (link). Particularly note the code between the first two (top two) plot figures.

If your data have frequency-limited noise, you can probably filter most of it out. There are several ways to design filters in MATLAB, including designfilt. My procedure for designing IIR filters is here: How to design a lowpass filter for ocean wave data in Matlab?

If you have broadband noise, you will have to use a different procedure. The Savitzky-Golay filter (the sgolayfilt function) is probably your best option.