1 Dec
2010
1 Dec
'10
12:33 a.m.
Andrew Gaydenko wrote:
How does Steve Harris' Harmonic generator LADSPA
plugin work? I mean relation
between controls (concrete harmonics levels) and transfer function
Vout = Vin(1 + a*Vin + b*Vin^2 + ...)
This can be done with waveshaping.
If your source is a sinewave you can run it's samples, x [n],
through a polynomial function:
y [n] = P (x [n])
and there is a way to calculate the required polynomial P
using Chebyshev polynomials.
I suspect that if you google for "waveshaping chebyshev" you
will find a more complete exposition than what I can drag up
from the depths of my memory.
Erik
--
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Erik de Castro Lopo
http://www.mega-nerd.com/