[Kst] Filter plugin...

[Andrew Walker]

I think what you're after here are the Butterworth pass filter (high, low, band, and notch) plugins. I 
don't believe they're accessibile from the commandline, but they are from the UI. You'll need to install 
GSL before building Kst though. 
 
Andrew 
 
==================== 
 
On Thursday 05 August 2004 15:54, William Jones wrote:  
> Version:           0.82 (using KDE 2.2.2)  
  
   Wow that's old.  Time to upgrade your Kst. :)    
http://extragear.kde.org/apps/kst.php  
  
> 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).  
  
   Could this be done with a plugin?  Recent Kst releases support plugins  
written in C.  You can't quite reference them from the commandline, but they  
should be able to provide this functionality I think.  
  
  
 


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