linuxaudio.org

Hi,
On Thu, Sep 22, 2011 at 09:38:51PM +0000, Fons Adriaensen wrote:

quoted text
> Even if it hasn't to work in real time Pd is probably the

> ideal tool to prototype such a system. The alternative

> would be to write some ad-hoc C/C++ code, possibly using

> existing 'feature extraction' libraries or plugin code.

>

> As a first guess, what you need would be:

>

> - (optional) some pre-filtering to make the trigger

>   more reliable,

> - the trigger itself,

> - a delay on the trigger,

>

> and in parallel

>

> - (optional) some pre-filtering for the envelope

>   follower,

> - an envelope follower,

> - when the delayed trigger arrives, read the envelope

>   follower and start the sample playback.

There is an object included in Pd to do quite good onset detections for

percussive sounds, it's called [bonk~]. Another object, [sigmund~], is a

pitch tracker for pitched sounds, but it also detects onsets.
A nice thing about bonk~ is that it can be trained to discriminate

between different kinds of sounds, so for example it can be made to

trigger different samples if you sing "pah" versus singing "tschk".
Another apprroach would be to use some software based on the aubio

library (like the Pd external)
Ciao

--

Frak

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