[PD] Fun with additive synthesis

[David Powers]

Is anyone able to provide a simple example of HOW I do this in PD? I don't
really understand the maths, and Miller Puckette's chapter in his techniques
book is way over my head. I've already tried looking at the example patches
in PD, they don't really help. Is there a way to produce some kind of list
of the harmonics in a signal and their relative strength in PD? Would this
require a lot of programming?

In a program like Plogue Bidule or Reaktor, I can perform fft
analysis/resynthesis without really understanding what's going on. I'm sure
PD is more powerful, but some help on this would be great, since I'm just an
auto-didact with all this stuff. Ten years ago, I was taught how to program
a giant Moog, splice tape from reel-to-reels, and do basic sampling and
sequencing on digital gear at the university; it was great, but it's not all
that helpful in this digital world I've entered!

~David

On 8/14/06, Mathieu Bouchard <matju at artengine.ca> wrote:
>
> On Sun, 13 Aug 2006, David Powers wrote:
>
> > Now, what I'd be curious to know is how I can get amplitude values in
> > order to do cheap simulations of various instruments (flute, cello,
> > etc.). I know this can be done with fft's, but I don't know how to get a
> > simple list of values between 0-1 that I can just plug into my additive
> > synth.
>
> You need to make your FFT use the same fundamental as the note you play.
> It might be easier to instead play the same fundamental as your FFT's
> instead. Note that instruments have various timbres depending on the
> pitch, so you really want something recorded at the same octave as what
> you're going to play (which is pretty much the difference between
> wavetables of the 1980's and those of the 1990's).
>
> For example, if you pick a blocksize of 64 and a sample rate of 44100 Hz,
> the fundamental is 44100/64 Hz = 689.0625 Hz = MIDI 76.766. For any
> power-of-two blocksize the result will be some Fa note minus one-eighth
> tone.
>
> For a sample rate of 48000 Hz, the fundamental is 48000/64 Hz = 750 Hz =
> MIDI 78.232. For any power-of-two blocksize the result will be some Fa#
> note plus one-eighth tone.
>
>   _ _ __ ___ _____ ________ _____________ _____________________ ...
> | Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
> | Freelance Digital Arts Engineer, Montréal QC Canada
>
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