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. _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev@email-addr-hidden http://lists.linuxaudio.org/listinfo/linux-audio-devReceived on Wed Dec 1 16:15:02 2010
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