3 Nov
2002
3 Nov
'02
3:11 p.m.
Steve Harris wrote:
yep, it doesn't seem to be getting easier the more we look at it.
the above approach could bring us close, but it does need xfading
and two chebyshev shapers.
been thinking about how to do a hard clipper with sinc some more
today, without real results though.
tim
On Sun, Nov 03, 2002 at 05:08:33 +0100, Tim Goetze
wrote:
if we normalize the incoming signal, apply the shaper(s), then scale
down, it just might work -- it will get the harmonic mix right at
least.
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. 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
:(