23 Oct
2002
23 Oct
'02
9:55 p.m.
Steve Harris wrote:
good. do you think the 44100/12 oscillation is a speaker
or output transformer effect?
now i've seen your code i know where a good deal of
what i have called aliasing is from. :)
did you mean to start the sample loop at index 1 in
crossover_dist_1404.xml? 0 sounds much better. i'm
afraid it still aliases a little, but it does look
like it's basically doing the right thing iiutc.
the problem with both the valve and the xover i think
is that the further you drive them, the edgier the
discontinuity gets. it would have to be computed at
sub-sample resolution, and interpolated in a band-
limited fashion for the real 'hard driving' i think.
my reasoning is that the problem we are facing here
is the same as in the generation of band-limited
square (or sawtooth, if you will) oscillation.
tim
Stacking the valve plugins is the key to making them
sound interesting.
ah, now i dig it. maybe you could make a note about the intended
use in the valve doc?
i've
copied (950 + 50 silent) samples of each into
http://quitte.de/fender-sine.wave -- the quitte.de quota is
Cheers. Just looked at it. It was what I was expecting from your
description. >Infact,
this should just happen, if you use the crossover plugin and
>put the output through your speaker cone IIR you should see a similar
yup, it definitely looks more like it on the
scope. but the
aliasing the crossover introduces is simply unbearable. i think
i'll go for a ride and show some waves to the guy who fixed my
fender amp recently, he knows a lot about the circuitry.
The crossover plugin was a shot in the dark, based on a vague description
of the effect by someone who understood the electronics. Now I have seen
your recording, and have applied some brain power to it it's obvious what
I did wrong, and how to fix it.