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Re: Converting from S to Z domain


From: Doug Stewart
Subject: Re: Converting from S to Z domain
Date: Mon, 21 Feb 2011 10:39:03 -0500



On Mon, Feb 21, 2011 at 7:49 AM, Jez Green <address@hidden> wrote:
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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First of all, there are many ways to go from s to z  
Impulse invariant
step invariant
matched pole zero
bilinear
prewarped bilinear
ZOH
FOH
etc.

Are you doing a filter, or a plant?

Did you look at help c2d?

I will help you, so just tell me more.

Doug



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