From: Larry Kayser (kayser_at_sympatico.ca)
Date: Fri Jul 11 2003 - 00:24:06 PDT
David:
Do you really want to continue this discussion over the public@setileague.org?
It is of course up to you but I do not see the point of it.........
OK, I have put in some hours of study.
1. I want to learn more about the "Baseline Smoothing" this sounds like a
gain equalization process but as I read the files available to me it seems
to do more than simply gain equalization.
2.
>Narrow band birdies are eliminated by cataloguing them. More difficult,
>for an amateur, is cataloguing non-local sources, but professionals
>do exactly that.
OK, this presumes that the birdies are constants in frequency, neat idea,
and very valuable for tones found inside the spectra on all or many or most
observations / data files.
My need is different, I need to look at a signal (tone) and remove it from
consideration because it does NOT meet a defined set of conditions,
frequency, duration of signal, chirp rate (using the .sah model for chirp
rate) etc.
3.
>In terms of recognizing patterns in individual FFTs, amateurs generally
>integrate across the whole beamwidth. I think the most common technique
>is to do that visually, by looking for steaks in a waterfall display.
>Chirp is visible at this level.
The operative word here is "beamwidth" a process of meaning within
SETI. Regretfully it has no value for my work. The reference to a visual
process is that I have no way to look at visual data on a 24x7 basis, it
just can not physically be done.
4.
> > I have since your first email put some hours into SETI@Home looking for
> > information on the fast folding algorithm. I have not found anything, so
> > your help could be very valuable in finding out what has already gone one.
>
><http://groups.google.com/groups?selm=39944AB0.7F6C0E0A%40setiathome.berkeley.edu>
well this source does not really dig into a fast folding algorithm. They
use the words but there is no reference to what it means. A Google shows
me enough information and sources eventually I will find a description that
can be implemented or evaluated or what ever hi.
5.
>I haven't got round to reading the source code yet.
what is the source of the source code please.....?
Larry
VA3LK
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