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 <por...@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 <por...@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 <por...@gmail.com>: >> >>> >>> 2017-04-13 19:25 GMT-03:00 JTG III <jordanthomasgibbons...@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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