[PD] band limited (anti-alias) techniques

[cyrille henry]

Le 24/11/2015 16:25, Alexandre Torres Porres a écrit :
> cool, I just miss a few bandlimited oscillators in Pd, I'm doing them as patches/abstractions, but I think the best way to go would be to code an external,

i think there is no need for externals.
there are at least 3 different implementations in pd vanilla that are fast and good.
(mine in nusmuk audio, the one in rjdj, and a 3d one made by Roman Heafeli that i don't know where to find)


cheers
c

  hopefully it ain't be too tricky and hard, but over my head one way or another :P
>
>
> 2015-11-24 13:22 GMT-02:00 cyrille henry <ch at chnry.net <mailto:ch at chnry.net>>:
>
>     yes, this can be very efficient when the table is pre computed.
>     using 32 bits int and a 8K sample table, I recently implement a BL saw~ in an arduino due with surprisingly fast and good result.
>
>     cheers
>     c
>
>     Le 24/11/2015 16:12, Frank Barknecht a écrit :
>
>         Hi,
>
>         On Tue, Nov 24, 2015 at 01:01:00PM -0200, Alexandre Torres Porres wrote:
>
>             Do any of you know the advantages and disadvantages between "*oversampling
>             + filtering*" and the other techniques?
>
>
>         A big difference is CPU load: the bandlimited oscillators in the rj-library
>         aimed at mobile devices of some years ago use the transition splicing technique
>         because it's one of the fastest. It only needs a simple table lookup in
>         addition to the phasor~ etc.  that are running anyway. We even replaced the
>         tabread4~ with tabread~ to save even more CPU.
>
>         Ciao
>
>
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