[PD] band limited (anti-alias) techniques

cyrille henry ch at chnry.net
Wed Nov 25 11:07:30 CET 2015



Le 24/11/2015 18:21, David Medine a écrit :
> 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.
>

if someone have access to this paper, i would love to have a copy.
cheers
c


>
> 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"<porres at gmail.com>
>> An:"pd-list at lists.iem.at"  <pd-list at lists.iem.at>
>> 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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