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freqz inconsistency ?
From: |
Pascal A. Dupuis |
Subject: |
freqz inconsistency ? |
Date: |
Wed, 12 Jan 2005 08:56:17 -0600 |
User-agent: |
Mutt/1.5.6+20040907i |
Hello,
I'm trying to understand some issues with invfreqz, and found some
inconsistency in freqz:
pdi = 0.97;
[Zz1, Wz1]=freqz((1-pdi), [1 -pdi], 128);
[Zz2, Wz2]=freqz((1-pdi), [1 -pdi], Wz1);
norm(Wz1-Wz2)
ans = 0
norm(Zz1-Zz2)
ans = 0.35010
as both frequency responses are evaluated at the same points, they
should give the same result, shouldn't they ?
I tried cheating a bit with
[Zz2, Wz2]=freqz((1-pdi), [1 -pdi], const*Wz1);
but couldn't find a constant such that both frequency responses are
the same. Any idea ?
TIA
Pascal Dupuis
--
Dr. ir. Pascal Dupuis
K. U. Leuven, ESAT/ELECTA (formerly ELEN): http://www.esat.kuleuven.ac.be/
Kasteelpark Arenberg, 10; B-3001 Leuven-Heverlee, Belgium
Tel. +32-16-32 10 21 -- Fax +32-16-32 19 85
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- freqz inconsistency ?,
Pascal A. Dupuis <=