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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On Tue, 26 Jun 2007 13:35:13 +0200 "henrik wurster" henrik.wurster@gmail.com wrote:

Sorry to miss this essential bit Henrik,

Yes, that's exactly what [bonk~] does. First play them (training) from the table using a [tabread~] sample player into [bonk~]. Then apply your live signals. However I am a bit confused about what your input signal actually is now.

Can you please clarify what signals are at each step by explaining the operation you desire. Hitting the bongo/piezo will give you a short impulse with ringing (resonance) at the drum frequency.

What does this have to do with recognising the samples?

It seems you want to map drum hits on to one or more bang messages to trigger one shot sample replays, perhaps using impact intensity (velocity) or pulses from more than one piezo trigger to make the selection.

Is that correct?

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