Finding peaks only in signal
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I want to find only the peaks in a signal that could have more than one frequency as shown in the picture
At the trough there is sometime small peaks that are being picked up using the findpeaks function.
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Star Strider
2015-7-30
You have a clean signal without much noise.
I would begin by doing an fft on your signal, and use it to choose the frequency components of interest. Then use a bandpass filter to keep the frequencies you want. (A brief description of filter design and implementation is here.)
After that, use findpeaks, choosing the appropriate name-value pairs to tweak it to your needs as necessary. It will be much easier to use findpeaks on the filtered signal than on the original unfiltered signal.
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