PSN-L Email List Message

Subject: Re: WinQuake Filtering Advice and/or Tutorial
From: Bobhelenmcclure@.......
Date: Fri, 21 Jul 2006 17:46:28 EDT

Hi Jerry,
 
  I design and code my own seismic digital filters, and I have yet to  find 
any reference that follows the "KISS" principle. The subject is highly  
mathematical. I got the most help on Butterworth filter design from 
 
_http://kwon3d.com/theory/filtering/lpass.html_ 
(http://kwon3d.com/theory/filtering/lpass.html) 
 
  The information there is drawn from the bible of signal  processing:
 
Oppenheim, A.V., & Schafer, R.W. (1989). Discrete-time signal  processing. 
Englewood Cliffs, NJ: Prentice Hall.
 
 You will find my program "WQFilter" for filtering WinQuake files  in the 
file "seismic_dataq.zip" at 
_http://www.jclahr.com/science/psn/mcclure/index.html_ (http://www.jclahr.com/science/psn/mcclure/index.html) 
 
  To explore the impulse response and bandpass properties of any  filter in 
WinQuake or WQFilter, use "Impulse.psn" as the source file. After  filtering 
it, you will see the impulse response of the filter. Use WinQuake's  FFT to 
reveal the corresponding spectral response of the filter. This is a very  useful 
exercise, even if you decide not to dig deeper.
 
Bob McClure






Hi Jerry,


 


  I design and code my own seismic digital filters, and I have yet=
 to=20
find any reference that follows the "KISS" principle. The subject is highly=20
mathematical. I got the most help on Butterworth filter design from 


 


http://kwon3d.com/the=
ory/filtering/lpass.html


 


  The information there is drawn from the bible of signal=20
processing:


 


Oppenheim, A.V., & Schafer, R.W. (1989). Discrete-time signal=20
processing. Englewood Cliffs, NJ: Prentice Hall.


 


 You will find my program "WQFilter" for filtering WinQuake f=
iles=20
in the file "seismic_dataq.zip" at http://www.jcl=
ahr.com/science/psn/mcclure/index.html


 


  To explore the impulse response and bandpass properties of any=20
filter in WinQuake or WQFilter, use "Impulse.psn" as the source file. After=20
filtering it, you will see the impulse response of the filter. Use WinQuake'=
s=20
FFT to reveal the corresponding spectral response of the filter. This is a v=
ery=20
useful exercise, even if you decide not to dig deeper.


 


Bob McClure
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