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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):<br>
<a
href="http://www.mirlab.org/conference_papers/International_Conference/DAFx%202004/Proc/P_061.pdf"><br>
http://www.mirlab.org/conference_papers/International_Conference/DAFx%202004/Proc/P_061.pdf</a><br>
<br>
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.<br>
<br>
Still, judging by the plots they provide, they seem to have overcome
the frequency warping issue (an artifact of unit delay) described by
Huovalainen. <br>
<br>
It'd certainly be interesting to see an what actual implementation
of this does, rather than just some matlab plots.<br>
<br>
-David<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/28/2014 07:43 PM, Alexandre
Torres Porres wrote:<br>
</div>
<blockquote
cite="mid:CAEAsFmgEv0DWpJ0YUeMPEr=Q_cwZ5jNf2LzGZVLy87h1SyQhrA@mail.gmail.com"
type="cite">
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<div dir="ltr">hi, do you know if the moog object comes from this
paper?
<div><br>
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<div><a moz-do-not-send="true"
href="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">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</a><br>
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