Thread View: sci.math.num-analysis
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Started by Jim Streicher
Wed, 08 Apr 1992 17:14
WANTED: digital filter source code
Author: Jim Streicher
Date: Wed, 08 Apr 1992 17:14
Date: Wed, 08 Apr 1992 17:14
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I am looking for source code examples (C, fortran, or pascal) of digital filtering. None of the "classic" books I have been referred to give any program examples. Specifically, I need a low pass filter (30-40 hz cutoff) for a data set sampled at 100 hz. Does anyone have any suggestions? Jim Streicher jim@heart.seas.upenn.edu ps if this type of request does not belong in this group please let me know. I'll search elsewhere.
Re: WANTED: digital filter source code
Author: dmatthews
Date: Wed, 08 Apr 1992 20:26
Date: Wed, 08 Apr 1992 20:26
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In article <73276@netnews.upenn.edu>, jim@heart.circ.upenn.edu (Jim Streicher) writes: > >I am looking for source code examples (C, fortran, or pascal) >of digital filtering. > >None of the "classic" books I have been referred to give any >program examples. > >Specifically, I need a low pass filter (30-40 hz cutoff) for >a data set sampled at 100 hz. > ... If this is not a real-time problem, the easiest way and the one that gives you the most control is to filter in the frequency domain. There you can create your filter to have the exact characteristics you want, multiply it by the data, and transform the result back to the time domain. It is a good idea to look at the impulse response of your filter (the absolute value of its transform) to see that it does not produce spurious ringing in the filtered data or otherwise unacceptably distort sudden changes. This method is treated inadequately or not at all in the few texts I have looked at. I don't have any actual code you could use, sorry. Dr. David L. Matthews, IPST, Univ. of Maryland, College Park MD 20742-2431 Telephone (301)405-4830 Internet dmatthews@uap.umd.edu FAX (301)314-9363 NSI/SPAN UMDUAP::DMATTHEWS
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