When digitizing analog filters using the bilinear
transform and similar methods, we often have to
deal with "delay-free loops" that arise (the Moog
VCF is a classic example). This is generally
done via algebraic manipulations on the transfer
function to eliminate the delay-free loops, since
they are not computable. If the original
structure must be preserved at all costs, then we
insert an ad hoc delay anywhere in the loop and
use a sufficiently high sampling rate, etc. - Julius
At 01:06 PM 4/22/2014, Timo Westkämper wrote:
Hi.
It is probably not an official term, maybe
unit-delay-less filter is a better term. Or zero delay feedback.
Here is a blog post that describes itÂ
<http://nbviewer.ipython.org/urls/music-synthesizer-for-android.googlecode.com/git/lab/Zero%20delay%20the%20easy%20way.ipynb>http://nbviewer.ipython.org/urls/music-synthesizer-for-android.googlecode.com/git/lab/Zero%20delay%20the%20easy%20way.ipynb
And here a paper that is often referencedÂ
<http://www.native-instruments.com/fileadmin/ni_media/downloads/pdf/VAFilterDesign_1.0.3.pdf>http://www.native-instruments.com/fileadmin/ni_media/downloads/pdf/VAFilterDesign_1.0.3.pdf
Timo
On Tue, Apr 22, 2014 at 11:00 PM, Julius Smith
<<mailto:[email protected]>[email protected]> wrote:
Hi Timo,
Please define "zero delay filters". I did a
Web search and only came up with vague
commercial references, no literature
citations. It's not a standard term in my experience.
- Julius
At 04:50 AM 4/22/2014, Timo Westkämper wrote:
Hi.
Has anyone experimented with zero delay filters in Faust?
It looks like the filter.lib has mostly other filters.
Br,
Timo Westkämper
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Julius O. Smith III <[email protected]>
Professor of Music and, by courtesy, Electrical Engineering
CCRMA, Stanford University
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