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Re: [sc-users] Time Strech/Compress with SuperCollider

Right now in SC there isn't a way to do this without granulation that I can think of. I have a few grain based UGens in my lib (Warp1 and other variations). With cubic interpolation used, these are pretty clean (and I have actually done the sin wave test, there is some phasing, but it works well).
I mentioned the other day in a post that I am also working on some PV UGens to do time-manipulation and saving of FFT data from SC, but these won't be done for at least another week as a couple other projects are taking up my time. These will be called PV_RecordBuf and PV_PlayBuf... I'll announce them once they are done. Of course, FFT will give artifacts also, so it is really more about what you care about. 

Finally, you should look at Juan Pampin's ATS:

http://www.dxarts.washington.edu/ats/
I have UGens already that use ATS files (called AtsSynth, AtsNoiSynth as well as others that return freq and amp data). Very clean, very efficient. You need to do the analysis from another program. Warp and Ats UGens are in the JoshUGens here: 

http://sourceforge.net/projects/sc3-plugins/

I'd say ATS is your best bet right now... give it a look!

Best,

Josh

On Oct 20, 2007, at 9:14 AM, PyoungRyang Ko wrote:


Dear advanced Users,

How can be a sound file produced by Time Strech/Compress in SC3?

E.g. I have a sine wave 440 hz with 10 second as a source.
I want to produce a new processed sound file from this source without pitch 
alteration but 11 second.

I want to have many files produced in this way:

Source duration 10 Sec.

Processed file 1: 9.995 Sec.  // 10 - (1 * 0.001 * 5)

Processed file 2: 9.990 Sec.  // 10 - (2 * 0.001 * 5)

Processed file 3: 9.985 Sec.  // 10 - (3 * 0.001 * 5)

Processed file 4: 9.975 Sec.  // 10 - (5 * 0.001 * 5)

Processed file 5: 9.03 Sec.  // 10 - (7 * 0.001 * 5)

And so on

The function for this series is not hard to formulate.

I don't know how to however combine the formula for
time-stretching/compressing.

I want to get the result as clean as possible.
That mean, if I use a sine wave, then the result should not contain so many 
other frequencies, furthermore NO GRANULATION of the sounds.

Is it possible with SC?

If not possible, I must waste so much time in Pro tools for each sound
file.....

Sincerely yours,
Your non-advanced SC neophyte

PyoungRyang Ko


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