AnsweredAssumed Answered

Vrf : fft

Question asked by VRFuser on Jun 2, 1997
Hello,

First, sorry for my english, I do not often use it.

I have used HP VEE 3.21 for a few months in order to mainly use fft.

My problem is that, because of the sampling, the fft returns me low values where
they should be nul. ie :
I generate a 1000 hz sin function and apply mag(fft(x)) on it.
I get a ray at 1000 Hz, and all the other values are arround 10E-10 - 10E-30
instead
of zero.

I tried to correct the problem by searching a logical minimum value for all the
frequencies, but unfortunately, this min value seems to me impossible to be
calculated.

So is there anybody to help me ?

Thanks for your help.
Laurent PERDEREAU
3D, Avenue de la Recherche Scientifique
45071 ORLEANS CEDEX 2
Tl. (33) 02 38 25 52 42
Fax. (33) 02 38 25 76 50
E.Mail : perdero@cnrs-orleans.fr


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