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How to recognize start-point and end-point if data looks like at picture. I want to recognize that wave at axis Z(blue) 50-125 has start at 50 and end at 125. Axis Y (green) wave starts at 125 and ends at 175. I cant use method when it simply does not equal zero because of noise in signal.

I assume wave starts with value 0 and ends with value 0. Data are represented as descrete values like this Point[time,value] Visualization of my data

SpeedEX505
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The standard approach for digital signal processing is to analyse the data using a fast Fourier transform algorithm.

Briefly, it quickly breaks up the signal into discrete frequencies, so in your case you would look for the very low frequencies in the data.

Bohemian
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