Re: Resynthesis Program

Les,

Sounds great! My thoughts: In order to really do a decent job of
resynthesis, first we need to get the overall envelope of the sound, and
apply  a reasonable approximation to the DDA envelope.

Next we need to get a good representative spectrum of the sound, and then
figure out which overtones change the most over the duration of the sound,
perhaps in order from least changing to most, and assign them to the four
envelopes, one being most static, four being most dynamic.

It would be better if we could implement it in Java, so that it is cross
platform. Perhaps it won't be too difficult to port it to Java once it is
done. I would say, go for it, then we can work on porting it.

There are several other programmers who have done some work in this area,
perhaps we can all network on this project - Jens Groh, Xavier Besse (K5000s
editor) and Klaus Tzieply (K5 Sysex bank loader).

Ultimately, I would like to see all these projects unified into one app that
supports the K5, K5000s, K3, and could perhaps be extended to other additive
synths later.

Have you seen Xavier Besse's K5000s editor program - it has all the java
source code, and some resynthesis and several types of analysis algorithms.

its at http://perso.wanadoo.fr/xazahouse/

Joel






----- Original Message -----
From: "Les" <[email protected]>
To: <[email protected]>
Sent: Friday, April 09, 2004 12:43 AM
Subject: [k5synth] Resynthesis Program


> I'd like to start designing a resynthesis program for the K5. Here's
> what I have in mind:
>
> The program will take a wave file and place it in memory. Once this
> is done, you can adjust the starting position of the waveform in the
> wavefile. At this point, you can enter the frequency of the waveform
> (the program will assume that the waveform is periodic - comes from
> an instrument with a definite pitch), or you can allow the program
> to determine the frequency on its own, though the results may not be
> as accurate.
>
> Once these adjustments are made, the program can analyze a single
> cycle of the waveform at the starting point you set to give you a
> snap shot of the harmonic spectrum. Then you can transmit the
> spectrum via MIDI to the K5. You can also listen to the
> resynthesized harmonic spectrum before sending it to hear if it is
> what you are looking for. The idea is that you can get a good
> approximation of an instrument's harmonic spectrum by playing around
> with the waveform starting point and listening to the resynthesized
> results.
>
> A coupla restrictions: My primary programming language now is C#. So
> the program will require that the .Net runtime be present in order
> for the program to run. Also, I will be using DirectX for handling
> the waveforms. This will require that the managed runtime version
> for DirectX also be installed. Hopefully, this won't be a problem.
>
> Any comments?
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>



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