How to filter

[Al-il-g8er]

Hi

I am new to labview and I am trying to filter the noise from a file and so far I have managed to smooth the data up to this point, using Butterworth and linear fit then using Savitzky-Golay and median filter, but now I am stuck. Any help or suggestions with a better filter process would appreciated.

[altenbach]

Filtering is always relative. It is up to you to determine what is signal and what is noise.

We cannot tell by just looking at a random picture, but it almost looks like you are already overfiltering, i.e. there is a strong correlation between adjacent points. How did the unfiltered data look like? What is the data expected to look like? What is the purpose of filtering?

If you have a mathematical model for the expected functional shape you could try nonlinear fitting. No filtering needed. 😄