[SciPy-User] Amplitude scaling in fft

Sharaf Al-Sharif sfalsharif@gmail....
Sun Jan 17 17:44:56 CST 2010


Hi,
I'm a bit confused regarding how the amplitudes returned by np.fft.fft (or
np.fft.rfft) relate to the amplitudes of the original signal in time domain.
If:
A = np.fft.rfft(a,n=2048)
but,
n_pts = len(a) < 2048,

will the physical amplitudes in time domain be np.abs(A)*2/2048 , or
np.abs(A)*2/n_pts? Or something else?
Thank you for your help.

Sharaf
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