[PD] better tabread4~
Atwood, Robert C
r.atwood at imperial.ac.uk
Fri Jun 13 18:39:37 CEST 2008
> -----Original Message-----
> From: pd-list-bounces at iem.at [mailto:pd-list-bounces at iem.at]
> On Behalf Of cyrille henry
> Sent: 10 June 2008 16:30
> To: Charles Henry
> Cc: pd-list at iem.at
> Subject: Re: [PD] better tabread4~
> Charles Henry a écrit :
> > On Tue, Jun 10, 2008 at 4:43 AM, cyrille henry
> > <cyrille.henry at la-kitchen.fr> wrote:
> >> i realized that the 4 points interpolation in tabread4~
> (and tabosc4~) are not optimal.
> > Please describe. I've analyze the interpolation formula too, and I
> > think that it is a true cubic interpolation. Is the numerical
> > accuracy bad?
> well, i think the tabread4~ interpolation is a lagrange
> interpolator (but i'm may be wrong).
> at least with tabread4~, the 1st derivative is not
> continuous, while it should be with a cubic interpolation.
> i program a cubic interpolation, and the shape of the
> waveform is really different.
Are we talking about 4-point polynomial interpolation versus cubic spline interpolation? These are indeed different.
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