How can i get frequency of the modulated signal
All my questions are showed in the picture.
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"Well, since it is for a "friend"...
An FFT (or Power Spectrum) will tell you all of the fundamental frequencies of your signal. This is pretty easy and there are functions in LabVIEW to do this. However, since you are only trying to determine the frequency of one square wave mixed with many sine waves, you can just look at the first dirivitive of the signal (dS/dt) and look for discontinuities (dS/dt = +/- Inf). This discontinuity is only due to the square wave signal component. Find the frequency of the discontinuities of the first dirivitive and you have your answer.
-Jim"
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