10-06-2011 01:03 PM
I´m trying to build a FFT7.1-core with system Generator. My biggest problem is that the spectrum looks other than I thought it must be.
I give a 1Hz sine-wave to the real-input and sample at 8Hz. Ithought that at a 8-Point FFT there must be one peak at the 2nd Point in spectrum and at the 7th Point.I get a Point at 5th and at the 8th. I have no Idea what is happening there.
Hope somebody can help me!
My .mdl-File is in the appendix.
10-06-2011 10:39 PM
not sure, but may it be that the outputs of the FFT come out in a shuffled order caused by the butterfly structure and need to be reordered?
Have a nice simulation