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## Main Question or Discussion Point

I tried to obtain the spectrum of a discrete signal and I had some problems...

If I compute on a PC the discrete fourier transform (FFT or DFT) I obtain valid fourier transforms (the same Excel computes...)...

...but how do I analyze a wave obtained using a microphone ? I don't get the same results professional programs do...I tried using as the "intensity" of a frequency the magnitude...I tried using the real component...the complex one...but still no good...

Can you help ?

If I compute on a PC the discrete fourier transform (FFT or DFT) I obtain valid fourier transforms (the same Excel computes...)...

...but how do I analyze a wave obtained using a microphone ? I don't get the same results professional programs do...I tried using as the "intensity" of a frequency the magnitude...I tried using the real component...the complex one...but still no good...

Can you help ?