<div dir="ltr">Hi David, <br><br>> <span style="font-size:12.8000001907349px">It'd certainly be interesting to see an what actual implementation</span><div><span style="font-size:12.8000001907349px">> of this does, rather than just some matlab plots.</span><div><br></div><div>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. </div></div><div><br></div><div>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.</div><div><br></div><div>Cheers</div></div><div class="gmail_extra"><br><div class="gmail_quote">2014-12-29 17:20 GMT-02:00 David Medine <span dir="ltr"><<a href="mailto:dmedine@ucsd.edu" target="_blank">dmedine@ucsd.edu</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
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" target="_blank"><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<span class=""><br>
<br>
<br>
<div>On 12/28/2014 07:43 PM, Alexandre
Torres Porres wrote:<br>
</div>
</span><blockquote type="cite"><span class="">
<div dir="ltr">hi, do you know if the moog object comes from this
paper?
<div><br>
</div>
<div><a 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" target="_blank">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>
</div>
</div>
<br>
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