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.