[PD] FFT + dac~ delay issue

[Kyle Klipowicz]

I know, it really demystifies the whole Uncertainty Principle haze of
confusion.  After learning that it's just a result of tradeoffs with
mathematical measurements, it doesn't seem like such a deep and
powerful revelation of the universe.  Good thing we can still be
baffled by String Theory.

~Kyle

On 9/15/06, Jarbas Jacome <jandila at gmail.com> wrote:
> Hello! Hey thank you for this reference to Hisenberg principle! Very excite!!!
> I never attempted to this relation. Now, finally I understand the
> principle better hehe
> thanks
> j.jR.
>
> On 9/15/06, Kyle Klipowicz <kyleklip at gmail.com> wrote:
> > Hi Daniel~
> >
> > It sounds like you're trying to use the phase vocoder, which is a bit
> > different than the Kraftwerk-style vocoder.  I may be wrong about
> > that.  But you shouldn't have to use a FFT to do vocoding in this
> > style.
> >
> > The traditional vocoder model takes a bank of tuned bandpass filters
> > to detect amplitudes across the modulator spectrum, and then use these
> > amplitudes to drive another set of bandpass filters to shape the
> > spectrum of your carrier signal.
> >
> > Tom Erbe of UCSD has a nice example patch that will probably be more
> > of what you want to do.  You can download it here:
> > http://music.ucsd.edu/~tre/171/w8a-vocoding.pd , and see more cool
> > things from the course that he teaches at his site:
> > http://music.ucsd.edu/~tre/ .
> >
> > BTW, the reason that you must use certain blocksizes for FFT work is
> > that the FFT actually operates on signal vectors, transforming a
> > fixed-time amplitude vector into a fixed-time frequency vector.  You
> > could do a FFT on a 64-sample signal vector  (Pd's native blocksize),
> > but its resolution would be pretty crappy, so that's why its better to
> > use a larger block size.  (This whole concept is actually the root of
> > the Heisenberg Uncertainty Principle
> > [http://www.newtonphysics.on.ca/HEISENBERG/Chapter3.html], since
> > better time resolution gives worse frequency resolution, and vice
> > versa.)
> >
> > I hope that helps!
> >
> > ~Kyle
> >
> > On 9/15/06, mami music <mami.music at gmail.com> wrote:
> > > Hi all i made a vocoder which spectrum is borrowed from an FM synth and the
> > > amplitude is from the line lin through an adc~.
> > > I have not been able to make it work completely in realtime. I´ve tried some
> > > stuff and it´s still with latency. How can i make it work real time? (my
> > > soundcard is an m-audio firewire 4-10)
> > >
> > > what ive tried:
> > > Basicly i have used the audio configuration and placed the latency value to
> > > 0:seems to mess up the dsp and work bad. The lowest latency i´ve got to
> > > achiev without damaging the audio is 50 ms.
> > >  The vocoder process i borrowed from one of the FFT examples included in PD
> > > extended. I have tried to change the settings of the block~ object in the
> > > subpatch that does all the vocoder+fft processing, but still nothing.
> > >
> > > can anybody give me a hint and also refresh the relationshib between block~
> > > and all the fft process being made there?
> > >
> > > thankz!
> > >
> > > daniel
> > >
> > >
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> > >
> > >
> >
> >
> > --
> >
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> > http://perhapsidid.blogspot.com
> >
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http://theradioproject.com
http://perhapsidid.blogspot.com

(((())))(()()((((((((()())))()(((((((())()()())())))
(())))))(()))))))))))))(((((((((((()()))))))))((())))
))(((((((((((())))())))))))))))))))__________
_____())))))(((((((((((((()))))))))))_______
((((((())))))))))))((((((((000)))oOOOOOO