On Mon, 21 Jan 2008 22:27:35 +0000 Jamie Bullock jamie@postlude.co.uk wrote:
On Mon, 2008-01-21 at 11:43 +0100, raul diaz wrote:
Hi Frank, list!
Thanks for your suggestion about Miller's documentation, very useful! I have taken a look to your [vosim] abstraction, very nice! There is any abstraction with an implementation of fof synthesis? I would like to play with vosim and fof techniques and compare both.
There is a PAF (phase aligned formant) synthesis example in the Pd documentation (F.12 and F.13).
PAF is related to, but not exactly the same as FOF (http://www.ircam.fr/288.html?&tx_ircam_pi2%5BshowUid% 5D=34&cHash=016189f3fb&L=1) although other than the implementation, I'm not exactly sure what the difference is. Anyone know?
FOF (formante onde function) is an additive method that uses a periodic impulse and a bank of tuned resonant filters as exponential sinewave generators, while PAF (phase aligned formant) is a modulation method that shapes a sinusoidal function with a lobed window at a subfrequency synchronised to the main oscillator. In FOF the partials are given explicitly by the filter coefficients, but in PAF the sidebands are a result of modulation. FOF has more in common with the vocoder while PAF is a special case of general VOSIM (wave packet method).
Jamie
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