How to remove the background noise from a signal?

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Hi. I have the following signal. I am mainly interested in getting the peaks of the red signal. So I want to remove the part (background noise whose data I have) within the blue box.
1. How can I do it?
2. If I want to remove the noise, can I simply subtract the original values in time domain? something like:
y = Signal (t) - Noise (t)
or I have to do it in freq domain?
Plot1 - Copy.jpg

Accepted Answer

Daniel M
Daniel M on 11 Nov 2019
Seems like you have determined what you want your threshold to be.
You can set those values to zero (or whatever the mean of your signal is), pretty easily:
x; % this is your data
xpeaks = x; % duplicate
thresh = 10; % or whatever it is
meanx = mean(x);
xpeaks(abs(x) <= threshold) = meanx;
% xpeaks will contain only the "peaks"
Daniel M
Daniel M on 14 Nov 2019
That's another approach, but it was unnecessary in this case.

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