3 Nov
2002
3 Nov
'02
12:38 p.m.
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