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Converting from S to Z domain


From: Jez Green
Subject: Converting from S to Z domain
Date: Mon, 21 Feb 2011 12:49:57 +0000

Hi,

I'm trying to convert

        s
-------------------
   s^2  +  4

into the Z domain.

Thus far I have written

octave:1> num = [1 0];
octave:2> den = [1 0 4];
octave:3> sys = tf(num, den, 1);
octave:4> z_sys = c2d(sys, 1);


Is this right so far?

How do I pull the final Z transform eqn from z_sys?

Thanks Jez



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