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varing results with rfft_fr16

Question asked by shekhar on Aug 25, 2010
Latest reply on Aug 17, 2011 by AndreasL
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I am using rfft_fr16 to generate the fft of any signal. As a prelimnary test I tried to generate the fft of a simple sine wave and plotted it.  The problem is that when I run the same code with different input sine frequencies the ouput peak has different amplitudes. As far as I understand the amplitude should not depend on the sine frequency as long as we don't start playing with the sine wave. Can someone point out why this is happening.





PS: I am using scaling factor "1". and trying it for a 512 point fft.