[PD] Analog/good-sounding oscillators in PD
Mathieu Bouchard
matju at artengine.ca
Thu Apr 13 05:38:58 CEST 2006
On Fri, 7 Apr 2006, Frank Barknecht wrote:
> 3.audio.examples/E05.chebychev.pd is the waveshaping example in
> Miller's docs.
You may also test with *any* Chebyshev polynomial using the following
polynomial:
[min 1]
|
[max -1]
|
[expr cos($f2*acos($f1)]
the min max are required because tabread4 needs one sample over each side
of the [-1;1] range, but that's not permitted by acos.
This expr *really* acts like a polynomial when used in the [-1;1] range.
That's the same formula that Chebyshev used to find the coefficients for
the polynomials.
_ _ __ ___ _____ ________ _____________ _____________________ ...
| Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
| Freelance Digital Arts Engineer, Montréal QC Canada
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