Actually, scrub that, PAF is more complex than AM, its also doing waveshaping using the windowing function. Here's an impulse + filter, side by side with PAF and with VOSIM so you hear the difference. Hear how the filter bank sounds nice but is rubbish and breaks when you move the frequency, PAF is smoother and thinner, VOSIM is richer and seems to move frequency the best. On Tue, 22 Jan 2008 00:25:49 +0000 Andy Farnell <[EMAIL PROTECTED]> wrote: > On Tue, 22 Jan 2008 00:46:18 +0100 > "raul diaz" <[EMAIL PROTECTED]> wrote: > > > Hi Andy, all! > > > > > > FOF (formante onde function) is an additive method that uses a periodic > > > impulse and a bank of tuned resonant filters as exponential sinewave > > > generators, > > > > > > > > > When you says "bank of tuned resonant filters" are you talk about the > > spectral effects produces by the FOF envelope, am I wrong? > > > No, not the envelope, as far as I know. I see at least two implementations of > FOF. The first comes from the CHANT vosim (Rodet) which uses stored table > oscillators (sines) and an exponential decay envelope. It can layer many of > these > together to create a single grain. Vercoe and Clarke both wrote different > Csound > implementations, the cool thing about one was that you could put anything you > like > (non-sine) into the wavetable at i-time to get crazy voices, and the other > computed > the sines so was less flexible but needed no memory. > > The other implementation I am aware of is Cooks (which I presume is in the > STK) > and uses parallel resonant filters. If you hit a highly resonant filter with > an > impulse it rings, so behaves like an exponential decay envelope on a sine > wave. > > Same method, similar algorithm, different implementations. > It's essentially additive/parallel. > > > VOSIM (Kaegi) and PAF (Puckette) are two implementations of a totally > different > method, which is basically AM to add sidebands to a sine. The modulation comes > from a raised window, usually Gaussian, narrowing the window effectively > increases > the modulator frequency and the position of two sidebands. > > It's a while since I read anything about these and there are several > implementations so I may be way off. In theory (and no doubt someones done > it) you > can do the same with FM and modulate the frequency of the packet. > > > > > > > > Or maybe are you talking about a different implementation from the original > > one by Rodet. > > > > I would know your suggestions about Pd implementation of FOF synthesis. > > > > > > Saludos! > > > > > > -- > > Raul Diaz Poblete > > ************************* > > [EMAIL PROTECTED] > > Barcelona [Spain] > > > > > -- > Use the source > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list -- Use the source
FOF-vs-PAF-vs-VOSIM.pd
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