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Re: impulse invariance question


From: Doug Stewart
Subject: Re: impulse invariance question
Date: Sat, 08 Apr 2006 22:06:01 -0500
User-agent: Mozilla Thunderbird 1.0.7 (Windows/20050923)

I made the statement below that all the infinite Laplace zeros are mapped to Z=-1
I now see that C2D maps all but 1 of these zeros to Z=-1.

I then did a google search for "matched pole zero" and found that both methods are used!!!!!!?????
I have a Text book that says all should be mapped to Z=-1.
So my question is: What is the correct way????
Doug Stewart




Doug Stewart wrote:

Ronald Crummett wrote:

Hi -
Does anyone know of an impulse invariance function for Octave, similar
to impinvar in Matlab?  I've been trying to write one but if someone has
already done so, or has any pointers, that would be sweet.

-Ron

Did you look at C2D  It has a matched pole zero option.

As I understand it the impinvariant filter is almost the same as the Matched pole zero filter. The matched pole zero has some added zeroes to make the number of zeroes equal the number of poles.
These extra zeros at placed at -1 in the Zed plane.

You could start with C2D and add impulse invariant to it.

If you want help or can't do it I will do it for you and the group.

Doug Stewart





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