MATLAB: How to get the main peaks from a signal with a lot of noises

findpeaks

I have a signal with a lot of noises and I would like to find those peaks that I have circled in the attached picture. I tried using findpeaks function with MinPeakHeight and MinPeakProminence options but I did not succeed. Thanks

Best Answer

That appears to be a Fourier transform of a noisy signal. If so, because the noise is broadband, a frequency-selective filter of the time-domain signal will not provide an effective solution.

I would use the envelope (link) function on the data you presented, and then identify the peaks of the envelope. You will have to experiment with it to get the resolution you want.

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MATLAB: Hello I have that emg signal (after using filter) as you see there is 5 different segments .I have to split these segments. How can ı develop automatic identification of these segments

I would use the findpeaks (link) function:

[pks,locs] = findpeaks(-your_signal)

Note the negation (‘-your_signal’). This flips it upside-down, so the minima become maxima. Use the ‘locs’ output to find the small minima, then use those indices to split your signal.

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Use the findpeaks (link) function. Since this appears to be a modulated sine carrier, you might also find the envelope (link) function helpful to recover the modulating signal, then use findpeaks on it as well.

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MATLAB: Hello I have that emg signal (after using filter) as you see there is 5 different segments .I have to split these segments. How can ı develop automatic identification of these segments

MATLAB: Count cycles in a signal

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