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noisy signal processing question. signal in detector with slope shift in some areas

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elis02
elis02 2018-7-24
关闭： MATLAB Answer Bot 2021-8-20
Hello,
I have several scans I did in a photodiode using an interferometer. The detector's size if very small so we see some drift in the slope of the zero (should be the offset) in some if the spectrum. I need the envelope above zero point. (there are some values below zero but I need those which are above)
Could someone help with this?
Attaching several text files with the examples. I have plenty more and need to understand how to process them.

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