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From: Jimmy on 19 Apr 2010 21:02
I looked under the mask of discrete fourier simulink block under Simpowersystem and I don't understand what algorithm is used to compute the magnitude and phase of a signal.
Let t be the simulation time and suppose we are interested in fundamental freq of 60Hz (first harmonic):
- To get the real part, it multiplies the input signal by 2*sin(2*pi*60*t) and then takes the mean to get the real part.
- To get the imaginary part, it multiplies the input signal by 2*cos(2*pi*60*t) and then takes the mean to the imaginary part.

I don't understand why this process works. What algorithm is this? Can somebody explain?

Thanks
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