[PD] Formant from SC in Pd?

[Alexandre Torres Porres]

well, seems like it's related to paf :)

check F13.paf.control.pd and you see the same parameters

so it seems Pd used to have this kind of oscillator natively, as part of
the extra objects (the paf~ external), but it was removed because of the
IRCAM patent. Since that patent expired, paf~ could be brought back to
vanilla's extra, and I have requested that before. I was considering making
a clone of Formant from SC, but now it really just makes more sense to
reinforce the idea of bringing the paf code back to business.



2017-04-14 16:23 GMT-03:00 Alexandre Torres Porres <porres at gmail.com>:

> checking Csound's fof opcode, formant really seems like a version of it
>
> 2017-04-14 1:55 GMT-03:00 Alexandre Torres Porres <porres at gmail.com>:
>
>> BTW, here's an excerpt from Formant's code, found in here
>> <https://github.com/supercollider/supercollider/blob/772bdd6946a7253390ba0b1b23eb3adc0acb97ea/server/plugins/OscUGens.cpp#L2451> from
>> line 2451
>>
>> LOOP1(inNumSamples,
>> if (phase3 < onecyc13) {
>> ZXP(out) = (*(float*)((char*)sine + (((phase3 + tqcyc13) >> xlobits) &
>> xlomask13)) + 1.f)
>>         *  *(float*)((char*)sine + ((phase2 >> xlobits) & xlomask13));
>> phase3 += formfreq;
>> } else {
>> ZXP(out) = 0.f;
>> }
>> phase1 += freq1;
>> phase2 += freq2;
>> if (phase1 > onecyc13) {
>> phase1 -= onecyc13;
>> phase2 = phase1 * freq2 / freq1;
>> phase3 = phase1 * freq3 / freq1;
>> }
>> );
>>
>> 2017-04-13 21:15 GMT-03:00 Alexandre Torres Porres <porres at gmail.com>:
>>
>>>
>>> 2017-04-13 19:25 GMT-03:00 JTG III <jordanthomasgibbonsiii at gmail.com>:
>>>
>>>> Chant was the program that implemented Fof synthesis, both developed at
>>>> IRCAM in the late 70's/early 80's or thereabouts.
>>>> I haven't used SC in a long time, and now I'm unsure about those ugens.
>>>> Also, a quick search for anything on the "filter version"  of FOF
>>>> didn't seem to bring anything up, but there's an article in this anthology
>>>> of early eighties Computer Music Journal articles that I have at home which
>>>> at least mentions it, I think. I can check when I get home, or you can find
>>>> it on Sci-Hub.
>>>>
>>>
>>> "Formlet", the "FOF-like filter", is just a resonant filter with an
>>> attack/decay envelope. I was able to replicate it. Though I get the idea
>>> that the fof-filter thingy is based on a bank of such filters, huh?
>>> "Formant", on the other hand, is described as an "oscillator", it
>>> "generates a set of harmonics around a formant frequency at a given
>>> fundamental frequency", has parameters for fundamental frequency, formant
>>> frequency and bandwidth of the formant frequency.
>>>
>>> I'm really curious on how to implement it as a pd patch ;) - but I don't
>>> think I've seen anything like it in the Pd world.
>>>
>>> cheers
>>>
>>
>>
>
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