Bob, thanks for elaborating!
Am 29.09.2011 um 19:56 schrieb Robert T. Short:
> Remember that a
> continuous-time Butterworth filter has infinite attenuation at
> infinite
> frequency, and the frequencies at infinity are mapped to the Nyquist
> edges.
I'd already suspected something like that, but since I don't have a
lot of literature on filters handy ...
> Just as an aside, there is no real reason to test for attenuation or
> other filter response characteristics.
... testing for correct attenuation seemed to be the other viable
alternative.
Alex
--
Dr. Alexander Klein, Diplom-Mathematiker
Physiologisches Institut | TransMIT Zentrum
Raum 543 | für Numerische Methoden
Aulweg 129 | Heinrich-Buff-Ring 44
35392 Giessen | 35392 Giessen
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