[Kst] [Bug 86659] New: command line option, supress low frequency signal/noise

William Jones wcjones at caltech.edu
Thu Aug 5 21:54:56 CEST 2004

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           Summary: command line option, supress low frequency signal/noise
           Product: kst
           Version: unspecified
          Platform: Debian testing
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: kst kde org
        ReportedBy: wcjones caltech edu

Version:           0.82 (using KDE 2.2.2)
Installed from:    Debian Package 4:2.2.2-13.woody.6 (3.0)
Compiler:          gcc version 2.95.4 20011002 (Debian prerelease)
OS:                Linux (i686) release 2.4.19-lac3

It would be really nice if there was a way to suppress low frequency noise (or signal, if one is so lucky) from a data vector.  This would be very helpful for visualizing small signals riding on large low frequency noise fluctuations. When viewing PSDs of real data, this option would obviate the frequent autoscaling problem, in which the interesting part of the spectrum is dwarfed by the noise at low frequencies.  

A command line option to implement the "Low Frequency Interference" subtraction would be very convenient.  The argument of the option could be the highpass edge in, say, units of the resolution element, or in Hz (if the sample rate is supplied as well).  For instance, the command line of this sort

kst -lfi 2 -r 200

would specify the sample rate (200 Hz), and the highpass edge of the filter required to overcome the low frequency noise in the data (2 Hz).



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