[PD] Audio segmentation

julien breval julienbreval at free.fr
Thu Oct 26 17:45:57 CEST 2006


Hello,

In 2004 I had a live improvisation patch that did something similar (it was used
during a bass/keyboard/computer concert with two musicians):

* first you had to record into a 30 sec buffer (fretless electric bass at that
time); recording was trigged manually at special moments
* during the recording, attacks were detected with [bonk~] and the times at
which they occured were stored in a [table] (there was a kind of chronometer
that started at the same time as the recording)
* after the recording was finished, you could play the buffer with a MIDI
keyboard; each key played the sound of the buffer from a specific time taken in
the [table] mentionned above (there was also a trapeze enveloppe for avoiding
clicks)
* actually, the sound was not played as recorded but by a phase vocoder similar
to the one that you can find in the pd.fft.examples, in order to timestretch
the sound with a default precession speed of 10% or such (MIDI aftertouch was
then used to alter the precession)

With a flute, you would have to replace the [bonk~] by a different "rule"
(unless you only play tongue rams and key percussion)

> On 10/26/06, Jamie Bullock <jamie at postlude.co.uk> wrote:
> > Hi,
> >
> > Has anyone done any audio segmentation work in PD, along the lines of
> > what is provided by BBCut for SuperCollider?
> >
> > The sort of thing I am looking for is the ability to take a monophonic
> > input (e.g. a flute), and perform on-the-fly segmentation of the audio
> > into a 'database' of notes or phrases depending on pre-determined rules.
> > The segmented 'events' would then be available for recall in an
> > arbitrary order.
> >
> > I have a few ideas of how to implement this PD, but I don't want to
> > reinvent the wheel, so if anyone has already done it and wants to
> > share...
> >
> > Jamie
> >
> >
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