On Wed, Dec 01, 2010 at 05:21:09PM +0300, Andrew Gaydenko wrote:
> On Wednesday, December 01, 2010 16:33:35 fons@email-addr-hidden wrote:
> > > 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.
>
> Fons, thanks! It is *that* trick I needed to eliminate my doubts wrt fs/2
> products :-) I think SRC is an approriate lib for up/down-sampling.
For the fixed ratios you need zita-resampler will probably
somewhat faster.
-- 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 20:15:02 2010
This archive was generated by hypermail 2.1.8 : Wed Dec 01 2010 - 20:15:02 EET