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Please teach me why wallfilter is IIR.

This question is answered

Posted by masatoshi nakashima

on Apr 06 2012 03:12 AM

Intellectual380 points

My name is Masatoshi nakashima,

I am learning ultrasound signal processing.

Please teach me about wallfilter algorithm.

In Application Report SPRAB11–November 2008

"Efficient Implementation of Ultrasound Color Doppler
Algorithms on Texas Instruments’ C64x™ Platforms",

there is a explanation of wallfilter.

"This module does an IIR filtering operation.

The basic operation done for filtering for each scan-line set is a multiplication of complex input
data matrix, X, with real coefficient matrix, W, given by,

Y DxN =X DxN  *    W NxN      "

I can not understand why this equation expresses IIR.  I think IIR should have feedback input.

(1) Please teach me, what is feedback element in this matrix conversion equation.

(2)Please teach me, how to design W matrix.

Please  pardon me for my  poor knowledge.

regards.

All Replies

Posted by masatoshi nakashima

on Apr 18 2012 20:52 PM

Intellectual380 points

This is a follow by myself. I read "Clutter Filter Design for Ultrasound Color Flow Imaging",

I understood IIR design method a little.

(1) what initialization method is adopted in the wall filter of MIDAS demo V3?

(2) Please teach the design parameter of the wall fileter of MIDAS demo v3.

thank you.

Posted by Uday

on Apr 20 2012 12:16 PM

Expert3720 points

Masatoshi,

This post should answer your 2 questions:

http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/439/t/149912.aspx#541961

- Uday

--- If you need more help, please reply. If this answers your question, please Verify Answer below this post ---

Posted by masatoshi nakashima

on Apr 21 2012 20:27 PM

Intellectual380 points

Mr. Gurani:

Thank you for your answer. I read the post which was shown me.

But I can not found wf_coeff.m.

Please teach me where it is.

And I can not found(understand ) the method of the filter initialization in the post.

Thank you.

Posted by masatoshi nakashima

on Apr 21 2012 20:34 PM

Intellectual380 points

Dear Mr. Gurnari,

I have read the post that you show me.

I can not find wf_coeff.m . Please teach me where it is.

Thank you.

Posted by Uday

on Apr 23 2012 14:35 PM

Verified Answer

Verified by masatoshi nakashima

Expert3720 points

The STK-MED that the e2e post refers to is the Medical Imaging Software Toolkit (STK-MED). You can download the latest STK-MED v3.0 from http://www.ti.com/tool/s2meddus and the file is located at 'stk-med-03.xx.xx.xx\miAlgos\dpu\test\vectors\wf_coeff.m'

- Uday

--- If you need more help, please reply. If this answers your question, please Verify Answer below this post ---