PSN-L Email List Message

Subject: Digital Filters
From: "Robert McClure" bobmcclure90@.........
Date: Sat, 21 Jun 2008 17:58:33 -0400


Hi Steinar,

  I have coded all sorts of digital filters for my seismic applications.
Take a look at http://bobmcclure90.googlepages.com/home.
I got the most help on Butterworth filters from
http://kwon3d.com/theory/datproc.html

  Kwon does not discuss high pass Butterworth filters, but it is easy
to convert a
low pass filter design to high pass by simply changing the value of
the A coefficients of the filter.

  My code is all in Visual Basic. You could easily translate it to C.
I can give you my code privately if you ask.

  It is best not to filter the log files. Filtering the heliplot
display is acceptable. If you suffer from spikes, it is best to
eliminate them at their source.

Cheers,

Bob McClure
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