[sdiy] Taking a Step towards - - --((FUTURE-PREDICTIONS))-- - -

[Karl Dalen]

As a suprising thing that the academics did discover some time
ago are that even such simple thing as a e.g elctric string bass
would easily require as much as 3900 to 4000 partials to be
resynthesised well. Bass notes how strange it may "sound"
requires an a massive amount of partials! 

Besides there is much different aproach in additive besides the
old oscillator bank idea, check out some of Xavier Rodhets
research. As a speculation his invert FFT might be used in
the Neuron.

If one would implement a oscillator bank in a FPGA should check
out the bell labs papers of the "intelligent oscillator" used
in the Synergy" It could be a nice staring point i suppose!?
They uses phase information to set amplitudes instead of 
multiply, if im not remembering completely wrong!

Regards
KD 

 --- harrybissell <harrybissell at prodigy.net> skrev: > Yes... but you get
to stay up all night programming each of the ADSRs
> for
> all the oscillators...  :^P
> 
> The reason why Additive Synthesis seldon is practical has nothing to do
> with
> the
> oscillators... but in the man-machine interface.  How do you handle it ?
> Resynthesis...
> heck why not just sample then...
> 
> Draw the waveforms... doesn't work. looks do not equal sounds.
> Figure out a set of parameters that have the same ball-wrenching effects
> as twisting a resonant filter knob and you will be getting there...
> 
> (I think even Cynthia will know what I mean, even lacking the direct
> reference :^)
> 
> How to control all those oscillators in real time ???
> 
> H^) harry
> 
> James Patchell wrote:
> 
> > I would say even with 256 oscillators, you could make a fairly nice
> > polyphonic additive synth.  If the fundamental freq is 200Hz, the 64th
> > overtone would be 12800 Hz, which I would think would be quite
> > adequate.  So 256 oscilators would give you 4 voice poly...and I would
> be
> > willing to bet that 1024 oscillators would be no problem, and that
> would
> > make 16 voices.  An additive synth in an XC3S400 would not be probably
> more
> > than a hiccup.... :-)
> >
> > hic...hic...hic....
> >
> > At 10:59 PM 1/8/2004 -0500, Glen wrote:
> > >At 09:27 PM 1/8/04 , James Patchell wrote:
> > >
> > > >         Well, I can easily see the XC3S400 being able to "emulate"
> at
> > > >least 256 oscillators and 256 multi mode filters and 512 envelope
> > > >generators (VCAs too), all at one time...in fact, if anything, I am
> > > >probably underestimating.  The part seems to be capable of clocking
> at
> > > >200MHz,  the part should be able to do all that in about 1.3 micro
> > > >seconds....kinda gives you an idea of the power we are talking
> about.
> > >
> > >It sounds like you could build a nice additive synth on a single
> chip, at
> > >least an additive monosynth. Is that about right?
> > >
> > >later,
> > >Glen Berry
> >
> >          -Jim
> > ***************************************************
> > I'm a man
> > But I can change
> > If I have to
> > I guess.
> >
> > Man's Prayer
> > Red Green
> >
> > ***************************************************
> > http://www.oldcrows.net/~patchell
> >
> > http://members.cox.net/patchell
> >
> > ***************************************************
>  

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