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.
The CMJ paper explains it in full detail. You might need a
University-style subscription to get the actual PDF:
http://www.mitpressjournals.org/doi/pdf/10.1162/comj.2006.30.2.19
but the reference is:
Välimäki, Vesa, and Antti Huovilainen. "Oscillator and filter algorithms
for virtual analog synthesis." /Computer Music Journal/ 30.2 (2006): 19-31.
On 11/23/2015 6:07 PM, Christof Ressi wrote:
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" <[email protected]>
An: "[email protected]" <[email protected]>
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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