Hey Thanks Bob,

You may cause my brain cells hurt, but what the heck.  You know, medical 
doctors say that the human brain has no nerve endings to hurt, BUT my head 
sure hurts trying to think sometimes!

I'll check these out.
Jerry
  ----- Original Message ----- 
  From: Bobhelenmcclure@.......
  To: psn-l@..............
  Sent: Friday, July 21, 2006 4:46 PM
  Subject: Re: WinQuake Filtering Advice and/or Tutorial


  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

    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

    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 







Hey Thanks =
Bob,
 
You may cause my brain =
cells hurt,=20
but what the heck.  You know, medical doctors say that the human =
brain has=20
no nerve endings to hurt, BUT my head sure hurts trying to think=20
sometimes!
 
I'll check these =
out.
Jerry

  
----- Original Message ----- 
  From:=20
  Bobhelenmcclure@....... =

  
To: psn-l@.............. 
  
Sent: Friday, July 21, 2006 =
4:46 PM
  
Subject: Re: WinQuake Filtering =
Advice=20
  and/or Tutorial
  


  
Hi Jerry,
  
 
  
  I design and code my own seismic digital filters, and I =
have yet=20
  to 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/=
theory/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 =

  processing. Englewood Cliffs, NJ: Prentice Hall.
  
 
  
 You will find my program "WQFilter" for filtering =
WinQuake=20
  files in the file "seismic_dataq.zip" at http://www.=
jclahr.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=20
  very useful exercise, even if you decide not to dig deeper.
  
 
  
Bob McClure