Subject: Re: [linux-audio-dev] [ann] unmatched - a LADSPA amp tone
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Sun Oct 27 2002 - 13:22:41 EET
On Sun, Oct 27, 2002 at 12:23:28 +0200, Tim Goetze wrote:
> that is great to hear! i can almost see the box glowing from
> the heat when the valves are turned on. the iir 'convolver',
> btw, suffers greatly when competing for the cache with other
> plugins now (8-9% @ 64/44.1). think i'll try the floats again.
> though the k6 really is cache-starved compared to modern cpus.
Well ,the more CPU you have spar, the more tempting it is to un extra
stages and the more cache starved it gets.
> >used for all the stages, I suspect a chebychev would be better for the
> >output, it would also alow us to model different amps with the same code.
> >We'd need to calculate the added harmonics from an amp though, maybe by
> >putting a sin through and FFTing it.
>
> i've uploaded yet another recording, line-sine-16.flac, which
> contains the line out (left) and the sine that went in. seems
> our total transfer function until that point needs more work.
I'm sure it does. I've been playing with myb ass and an ecasound chain:
ecasound -i /dev/dsp -o /dev/dsp -el:valve,1,1 -el:dcRemove -el:amp,4
-el:valveRect,0.5,0.5 -el:sinusWavewrapper,2 -el:valve,1,1.5 -el:dcRemove
-el:amp,-10
It needs some filters and more work, but it sounds pretty good to me.
I'm having a problem than when the input is 0, the output is infinite. I'm
not sure if its a result of the optimisations I did, or it it would do
that anyway.
I haven't listent to your recording yet, but I do that soon.
- Steve
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