30 Oct
2002
30 Oct
'02
1:15 p.m.
Steve Harris wrote:
Thanks for doing that, I haven't had the time. Can
you produce a spectrum
plot for the current s/w chain?
http://quitte.de/sine-spectrum.gif
http://quitte.de/straight-spectrum.gif
the first is generated by this chain:
Sine (1046.5022612023945), # c'''
Valve (.3, .7),
HiPass (200),
Inverter(),
Rect (.5, .6),
Inverter(),
SineShaper (2.),
Valve (.7, .8),
HiPass (30),
the second is the same chain with the SineShaper left out.
It would be more efficient to just calculate the corect
chebyshev in
realtime, the problem is that they have lienar CPU cost with the number of
harmonics, 20 harmonics for example will be pretty expensive. As we are
building on the existing harmonics generated by the valve sim though we
shouldn't need that many.
there's one problem i see: if we employ a chebyshev, it is going
to create harmonics no matter what amplitude our incoming signal
is iiutc. this is unlike the real thing, which will produce a
different spectrum if one is playing softly, or with the volume
control set low. (i'm fond of this effect because it allows me to
change the sound pretty drastically without having to walk over
to the amp.)
tim