to infinity and beyond (Re: ArtsCompressor state)
- From: Tim Janik <timj gtk org>
- To: Stefan Westerfeld <stefan space twc de>
- Cc: beast gnome org
- Subject: to infinity and beyond (Re: ArtsCompressor state)
- Date: Tue, 7 Sep 2004 23:02:11 +0200 (CEST)
On Tue, 7 Sep 2004, Stefan Westerfeld wrote:
> There is no scale in beast currently which allows infinity on it,
> currently, though. Maybe 100 or 20 is a good enough approximation for
> infinity in practice.
i'm not sure what "infinity" is here. suppose you have a scale ranging
from +12 to -96 (dB), do you:
a) want the GUI to only do s/-96/-oo/ ?
(this could easily be done with a property hint)
b) want the GUI to provide a normal slider intervall [+12,-96[ but at
position -96 display -oo and pass -G_MAXDOUBLE to the module?
(this would better be done by (a) and implementing the
-96 => -oo substitution in the module)
c) want the GUI to do a *real* interpolation to oo? say we subtitute
"only" 1000 for oo: we still get major oscillations. i have attached
two files with spline interpolations of the given fix point sets:
oo-ymil.dots: pixels / dB:
{0,12}, {1,6}, {2,3}, {3,0}, {4,-3}, {5,-6}, {6,-12}, {7,-24}, {8,-48}, {9,-96}, {10,-1000}
oo-xmil.dots: dB / pixels (this is what our dB scales actually use):
{12,0}, {6,1}, {3,2}, {0,3}, {-3,4}, {-6,5}, {-12,6}, {-24,7}, {-48,8}, {-96,9}, {-1000,10}
you can view them with:
$ echo 'plot "oo-ymil.dots"; pause 300' | gnuplot -
$ echo 'plot "oo-xmil.dots"; pause 300' | gnuplot -
the oscillation here basically means that you can't find a continuous
monotonic transition to such large values anymore. you can help that
dilemma by lengthening the last segment that transitions to oo (in
this case, to transition from -96 to -1000, 3 to 4 extra segments
suffice), but the larger the value you substitute for oo is, the
more extra segments you need, leaving you with scales like:
{0,0}, {1,-25e-4}, {2,-50e-4}, {3,-75e-4}, {4,-1e-6}
to fade to just a million, i.e. you spend all your scale estate fading
to oo, far beyond the interesting range of +48 to -96.
as a consequence, beast currently supplies a usable scale down to a comparatively
small dB value (most dB scales out there don't actually scale down to -96), but
doesn't cheat by simply displaying "-96" as "-oo".
> Comments? Thoughts? Ideas?
>
> Cu... Stefan
---
ciaoTJ
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