[Scilab-users] FFT doubt

[andre.regis13 at gmail.com]

Dear colleagues,


I have two functions f1(x) and f2(x). Using the following formula:​ 

 



to calculate the results, get: 5.125[units]. 

I tried to calculate separately by F1=fft(f1) , F2=fft(f2) and then multiply stems one by one and adding the results. I found two problems:

1 - I have been used Hamming window to minimize noise. The amplitude of each signal changes and the final results too;

2 - When I change the number of samples, the results change too.

None the results in 1 or 2 are igual or close to 5.125 (this is right).

What am I doing wrong?

Can someone help me? 

Thanks a lot.


_______
Eng. André Luiz Regis Monteiro, M.Sc
andre.regis13 at gmail.com


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