[linux-audio-dev] [ann] unmatched - a LADSPA amp tone

Tim Goetze tim at quitte.de
Sun Oct 27 20:46:01 UTC 2002


Steve Harris wrote:

>> code in there right now. i still need your new valve and rect
>> implementations to evaluate the right thing.
>
>They dont sound different AFAIK, they are mathematically the same.

it's an ideal case of exp2 approximation then. :)

>> still some higher-order harmonics missing, i think.
>
>Probably, maybe that hard clipper needs writing :(

i'm looking at that line-sine max overdrive wave (please find
it at quitte.de/wave.ps.gz), and i think it just might work to 
see its behaviour like this:

the longer the wave is on one side of zero, the more energy is
built up that tries to push it back. as long as the system is
fed enough energy to keep it this side of zero, it is basically
decaying exponentially against a (more-or-less) constant value.

once the energy input becomes too weak to keep the state on
this side of zero, it starts accelerating towards zero and beyond.
the longer it stays there, the more energy is built up pushing
it back, etc.

i am not sure how to do it so it doesn't alias, which i fear a 
naive implementation would do.

your thoughts?

tim




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