Subject: Re: [linux-audio-dev] [ann] unmatched - a LADSPA amp tone
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Thu Oct 24 2002 - 02:45:27 EEST
On Thu, Oct 24, 2002 at 01:01:45 +0200, Tim Goetze wrote:
> http://home3.netcarrier.com/~lxh2/pod.html
>
> where a sine morphs into something almost perfectly square
> as the gain rises (much like your first link's scope
> images from the real tube thing).
>
> i'm not sure how to correctly model this clipping in sw.
> steve's valve.xml is, afaict, not guaranteed to be band-
> limited if we extend it to support this kind of shaping.
No, it will not be bandlimited. I'l have to think about how to do this.
Maybe just by using an oversampled Chebyshev(sp?) and increasing harmonic
level with the amplitude.
I've been playing with the crossover dist, I've implemented some better
crossover behaviour and fixed a serious (and stupid) bug, which is
probably the source of some of what sounded like aliasing.
It only does something meaningful if you run it with smoothing=1.0
The fixed version is in
http://plugin.org.uk/snapshots/swh-plugins-2002-10-24.tar.gz
It also contains a decent mono compressor for anyone else reading this.
- Steve
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