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How to make a signal more flat ?

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scaramanga
scaramanga 2012-7-20
Hello,
I have a signal which looks like a dome and I would like to make it flat (hence reducing its amplitude). I can reduce the amplitude by dividing the whole signal by the same amount, but I would like to be able to control the amount of reduction I do on each signal location. Any idea of what kind of operation i should use ?
Regards

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Image Analyst
Image Analyst 2012-7-20
You can subtract the mean
newSignal = yourSignal - mean(yourSignal);
Then multiply by the array that contains the reduction factors that varies as a function of location:
flattenedSignal = reductionFactors .* newSignal;
Note, you must have reductionFactors because you said "I would like to be able to control the amount of reduction I do on each signal location" so you obviously know what those reductions are. Then finally add back in the mean:
finalSignal = flattenedSignal + mean(yourSignal);
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Miro
Miro 2012-7-20
this depends on the theoretical background of the data. I mean sure, you can just cut the signal fe. like:
ref = yoursignal/max(yoursignal);
newSignal = yoursignal*exp(-ref);
in this case larger signals get cutted more than smaller ones relative to the maximum of the signal.
scaramanga
scaramanga 2012-7-23
@Miro : Your solution seems the closest from what I expect. I'm going to start from it and see where it does lead me.

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更多回答（2 个）

Miro
Miro 2012-7-20
you could use SMOOTH it provides a moving average, that makes a signal more continuous(flat)
scaramanga
scaramanga 2012-7-20
编辑：scaramanga 2012-7-20
It won't be enough. I give you a picture of my signal : http://www.imagup.com/data/1157449109.html, Basically I want that it fluctuates around ~0.35.

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