[LAU] Voice-to-drums in general and the Trigger LADSPA in particular

Frank Barknecht fbar at footils.org
Fri Sep 23 08:24:02 UTC 2011


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


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