[PD] Formant from SC in Pd?

[Alexandre Torres Porres]

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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