here's the discussion from the forum, I could also try reviving that thread :)
http://forum.pdpatchrepo.info/topic/6185/feedback-fm-algorithm/2 2015-11-06 16:49 GMT-02:00 Alexandre Torres Porres <[email protected]>: > > Howdy, I'm just trying to understand how the Feedback modulation works in > FM8 (from NI) and how it really is the same as in DX7. I'm actually also > using SuperCollider, which provides a self modulating oscillator > (SinOscFB), but it just burst and blows up in noise way before the FM8 does > with the same modulation index. I've made an equivalent patch in Pd for > SinOscFB. Now, I know that in Supercollider there is no filter in the > feedback, and I was researching around the web and found out about the DX7 > patents where they described the usage of a mean filter in the feedback > loop. Here's the patent > http://www.google.com/patents/US4249447?dq=4249447&ei=7vK4T_m5LKOH6QHH2pTsCg > > this was actually discussed in a Pd Forum. I tried the mean filter in the > feedback loop, but it doesn't really sound closer to FM8's self modulating > oscillator. FM8 is supposed to be a kind of perfect clone to DX7. I don't > have a DX7, but I have FM8, so I'm using it as a guide to recreate DX7 > patches in Pd. > > This may be a long shot, but I wonder if anyone out there could help me > out nailing the perfect sound and behaviour of the self phase modulating > oscillator. > > thanks > >
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