Magnitude Surface 2nd order sampled Lowpass filter,
Impulse Invariant approximation.
Cuthbert Nyack
The magnitude surface within the unit circle of
the sampled "equivalent" of a second order Butterworth filter derived by
use of the Impulse Invariant approximation is shown in the applet below. "ws" is the
sampling frequency.
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COPYRIGHT © 1999 Cuthbert A. Nyack.