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IIR block and "Manual" IIR

Question asked by leonxp on May 17, 2013
Latest reply on May 26, 2013 by KJBob

Hi everybody. I was working on an IIR filter implementation using blocks avaible in the IDE. I disegned a second order IIR (5 coefficients). I tried to compare performance between IIR filter I designed with IDE blocks (patch pic attached) and the block "Second Order General IIR filter", with "IIR Coefficient" approach, They have frequency responses completely different and I don't know really why.

Did I make some mistakes?

 

Patch

IIR.jpg

direct.jpg

feedback.jpg

 

 

Manual IIR FR

manual_iir_fr.jpg

 

 

General IIR (IDE embedded) FR

gen_iir_fr.jpg

 

 

 

Thanks very much,

regards.

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