How can I split the signal in matlab

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I have 25 signals. these signals exist as a double. that is, when I want to plot a signal I have, I write the plot (t1, y1) command. I am sharing the screenshot of this graph of my signal with you. My goal here is to divide the signal in two from the place I marked. The left side of the graph is noise, and the right side of the graph is noise + signal. Since I have 25 different signals, the noise width of each is different. The code that I want to write here is that these 25 signals can be automatically divided into two as noise and noise + signal.
  3 Comments
Walter Roberson
Walter Roberson on 8 Mar 2021
I don't see it. To me the ambient noise appears to be approximately +/- 0.05 .

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Accepted Answer

Image Analyst
Image Analyst on 8 Mar 2021
How about
index = find(signal > 0.47, 1, 'first');
noisyLeftSide = signal(1:index);
goodRightSide = signal(index+1 : end);
  4 Comments
Walter Roberson
Walter Roberson on 9 Mar 2021
No, but we just might be able to estimate the +/- 0.05-ish noise that I propose is the true ambient noise. It is not clear to me that 0.47 is objectively justifiable.

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