[PD] Seam carving audio
Mathieu Bouchard
matju at artengine.ca
Tue Jul 8 08:53:56 CEST 2008
On Mon, 9 Jun 2008, Chris McCormick wrote:
> Something struck me whilst out walking today; has anyone applied the
> seam carving technique:
> <http://en.wikipedia.org/wiki/Seam_carving>
> <www.youtube.com/watch?v=6NcIJXTlugc>
> to FFT data to do a timestretch/timecompress that is more sensitive to
> attack sounds and note lengths?
I doubt that this would work at all. It's already of dubious use on
images, as it introduces distorsions that even though they are made to
look least like distorsions, are serious distorsions anyway, and can mess
up the perception of the content seriously. Compared to the "deleting
least important columns" technique that they show at 1:40, the Seam
Carving technique sweeps the distorsions under the carpet. After that,
don't wonder what the big lump under the carpet is.
When applying the technique to the spectrogram of a song, you should hear
it many times more than you'd see it.
Perhaps it can be used as an interesting special effect, supposing that
what you want to do is mess up the rhythm seriously and turn chords into
arpeggios in truly weird ways. However, it will work at the sine wave
level, which is somewhat less attractive than if it worked on notes.
Instead of applying it on FFT, you could apply it on a piano roll. (A real
one, unlike GridFlow's patch of that name, which is actually botched FFT
synthesis)
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| Mathieu Bouchard - tél:+1.514.383.3801, Montréal, Québec
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