On Wed, Dec 01, 2010 at 03:13:03PM +0300, Andrew Gaydenko wrote:
Fons, I want just polinomial transformation regardless
harmonics at all. I
have mentioned harmonics as a result of searching a LADSPA plugin related to
my needings.
Then what is your question ? All you need to do is compute the
polynomial for each input sample.
I'm afraid direct amplitude caculation in
accorance with a0...aN will produce
"too fast" signal deviation, resulting in exceeding fs/2 band.
Any non-linear transfer function will do this for some inputs.
If you have an x^N term, anything above Fs/(2*N) will alias.
If you want the nonlinearity without aliasing, you have to
upsample (by a factor N, with N = highest power of x used),
apply the nonlinear function, then downsample.
Ciao,
--
FA
There are three of them, and Alleline.