Le mardi 26 juin 2007 à 13:35 +0200, henrik wurster a écrit : 
hello gang,

Hi Henrik!

I have a project with pd using piezo sensors attached to my bongos
underneath the skins. they actually work not too bad as microphones,
but what I want to do is trigger the strokes being played on the bongos.
in the end I want to trigger matching samples which I recorded previously.
in my research how to detect small percussion instruments, I stumbled
upon the bonk object, but don`t know how to work with it, because I am
really new to pd...:)

I recently had to develop something similar, a darbuka player triggering video samples, launching effects and so on.

Technically,  we pasted a very basic Yamaha DT20 piezo microphone (24€)  to the socket of the darbouka, not to the skin because of tone alteration. We sticked the pieoz to the faience way of "Patafix", french name for UHU Tac in Germany/Schweiz, (double sided tape doenst work since most percussive instruments are round ;-). The Yamaha is ok , it's cheaper and not so hard to DIY but i'm no soldering iron maestro.

I made a patch that detects odd/even beats (very basic, [alternate] ) , silences and pitch using the Aubio library by piem. Why not bonk~? it reminds me too much of the old Max/M$P days...

Basically, onsets trigger a pulsating video effect, whose value increases across time and the player's loudness (using aubioonset~ and a settable threshold value for better live feeling)
onsets also triggers pitch detection: when this value is located within various intervals, it modifies the video sequence being played (kidn of sampler). I use chained [moses] objects for that purpose.
i also  track gain  after a [env~] and [oneshot] object cleared by the "odd beat" onset detection to track "silence" and have the video faint away





I dont expect any patching, but can anybody help me to give me an idea
how I could start buiding the patch ? I thought about loading the samples
into an array, but does bonk work at all checking sounds with recorded
samples ? thanks for any piece of advice

Actually, you've got two sub-programs: a first one that detect pitch/onset , then the audio sample player, + some glue around it.

bonk~/fiddle~ only fits in the first.

++

OH

best regards,
- henrik

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