This is the Zero frequency term you won't find it in frequency dependent signal no ?? so I am skipping it for FFT but when you need to go back to time domain it looks like it is needed now I need to figure out if it is possible to calulate it or do without it.

Hi ThomasL,

Danke !
Yes you are right, there is something wrong with what I am doing.
For the moment I am almost sure it comes from the components A[0] and the negative frequency values (symetrical) but I can't find how to do it.

Hello,

I am trying to rebuild a time signal domain from frequency domain data.

For this I create a time domain data and then I apply the fft (this part is only to create a random signal and get frequency domain equivalent signal). Like this I have the input for my script which is supposed to ...