Obtaining fundamental frequency wave from a PWM signal

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Hi, Is there a way to get harmonic waves extracted from a signal. Say if I have a square wave I want to extract and plot 3 sin waves.
Similarly if a a PWM signal (ie a square wave), is it possible to plot the 1st fundamental sine wave.
Please refer to the subplot #5 of the attached screen shot http://imgur.com/CSdqRyV
Thank you

Accepted Answer

laurie on 21 Aug 2013
it seems you want to do a Fourier transform of your signal. See http://www.mathworks.fr/fr/help/matlab/ref/fft.html
once you get the Fourier transform results, you can delete all frequencies except for the fundamental one, do a reverse Fourier transform and plot the result.

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