[PD] moog

[Alexandre Torres Porres]

Hi David,

> It'd certainly be interesting to see an what actual implementation
> of this does, rather than just some matlab plots.

An actual implementation is provided in the MoogFF filter in Super
Collider, you can just download and try it out. The code of the object is
also provided somewhere, as it is a source code.

I'd like to understand pd's [moog~] object one day, and implement it with
[fexpr~] or something. Maybe I'll do this other one as well.

Cheers

2014-12-29 17:20 GMT-02:00 David Medine <dmedine at ucsd.edu>:

>  I believe, though I may be wrong, that the Moog vcf object is based on
> the algorithm described in the 2004 Huovalainen paper (citation [6] in the
> Fontana):
>
>
> http://www.mirlab.org/conference_papers/International_Conference/DAFx%202004/Proc/P_061.pdf
>
> I am a little confused here (in the Fontana) by the author's assertion
> that he can implement a 'delay-free' loop by computing the output first,
> and then finding the states of the filter based on this. I don't quite see
> how this is different from finding the states first and then finding the
> output -- chicken then the egg vs. egg then the chicken.
>
> Still, judging by the plots they provide, they seem to have overcome the
> frequency warping issue (an artifact of unit delay) described by
> Huovalainen.
>
> It'd certainly be interesting to see an what actual implementation of this
> does, rather than just some matlab plots.
>
> -David
>
>
> On 12/28/2014 07:43 PM, Alexandre Torres Porres wrote:
>
> hi, do you know if the moog object comes from this paper?
>
>
> http://quod.lib.umich.edu/cgi/p/pod/dod-idx/preserving-the-structure-of-the-moog-vcf-in-the-digital.pdf?c=icmc;idno=bbp2372.2007.062
>
>
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