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Välimäki and Houvilainen have published a number of articles about
something called 'differentiated parabolic waveforms'. Basically,
you square a digital sawtooth and put it through a one-zero
differentiating filter (y(n) = x(n) - x(n-1)). What you get out is a
slightly rounder (less aliasing) sawtooth. I've never actually tried
this, but it looks pretty interesting and could easily be patched.
Super simple.<br>
<br>
The CMJ paper explains it in full detail. You might need a
University-style subscription to get the actual PDF:<br>
<a class="moz-txt-link-freetext" href="http://www.mitpressjournals.org/doi/pdf/10.1162/comj.2006.30.2.19">http://www.mitpressjournals.org/doi/pdf/10.1162/comj.2006.30.2.19</a><br>
but the reference is:<br>
<div id="gs_cit0" tabindex="0" class="gs_citr">Välimäki, Vesa, and
Antti Huovilainen. "Oscillator and filter algorithms for virtual
analog synthesis." <i>Computer Music Journal</i> 30.2 (2006):
19-31.</div>
<br>
<br>
<div class="moz-cite-prefix">On 11/23/2015 6:07 PM, Christof Ressi
wrote:<br>
</div>
<blockquote
cite="mid:trinity-e988358b-2198-44fa-9de9-69c464f8e136-1448330870449@3capp-gmx-bs59"
type="cite">
<pre wrap="">I can think of at least two:
1) wavetables filled with sinesum/cosinesum (possibly blending between different wavetables according to frequency --> many partials for low pitches, few partials for high pitches)
2) transition tables (check out 3.audio.examples/J09.bandlimited)
Gesendet: Dienstag, 24. November 2015 um 02:30 Uhr
Von: "Alexandre Torres Porres" <a class="moz-txt-link-rfc2396E" href="mailto:porres@gmail.com"><porres@gmail.com></a>
An: <a class="moz-txt-link-rfc2396E" href="mailto:pd-list@lists.iem.at">"pd-list@lists.iem.at"</a> <a class="moz-txt-link-rfc2396E" href="mailto:pd-list@lists.iem.at"><pd-list@lists.iem.at></a>
Betreff: [PD] band limited (anti-alias) techniques
hi, I know about the oversampling + filtering technique, which you can patch it, but what are other techniques for creating band limited signals you people know (not only those you could do it as a pd patch)? Yes, I'm thinking about oscillators mostly.
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</pre>
</blockquote>
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