On Sun, Nov 03, 2002 at 05:08:33 +0100, Tim Goetze wrote: > the peak value of the chebyshev-shaped output will be the sum of all > coefficients calculated in this manner. the further the incoming sine > is scaled down (from [-1,+1]), the less the harmonic mix will match > the wanted amplitudes.
Hmm, I suspect that this sames the cheby unsiutable for what we want, the output from a guitar appears to be far fronm a sin. > for the amp code, this would mean we should probably try the > following: compress/expand the incoming signal to fit exactly into > [-1, 1] (normalize). the coefficient tables need some treatment, too > -- we want the output sum to be 1, and the relative strengths of the > harmonics to match. > > i'm not up to understanding all implications of the fact that the > incoming signal is not a pure sine; neither do i have a recipe for > preparing the coefficient tables -- if we scale the individual > coefficients by 1/sum their mix will not match what we want. I think we should probably abandon the cheby approach for now, this combined with the freqency dependency problem probably makes it a looser :( - Steve
