Am 28.09.2011 um 21:18 schrieb Jeffrey Cunningham:
> Here you go:
>
> damp_db =
>
> -0.0426 -0.1679 -3.1179 -14.1980 -27.3152
>
>
> damp_db =
>
> -0.0003 -0.0015 -3.0103 -53.2194 -103.2218
Jeff,
thank you! So, butter in Octave is equivalent to butter in Matlab.
I reviewed my test cases, and it turned out that the excessive
attenuation was due to the test signals being too close to the nyquist
frequency. On the other hand, I wouldn't have thought that a signal at
80% of the nyquist limit would provoke such problems. I really wonder
if the effect is a consequence of the IIR-nature of the filter ...
All the best,
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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