For another performance I am creating a light organ simulation with csound
and processing.
The idea is simple, split the audio signal into low, mid and hi bands and
send the data via OSC to processing to do some animation.

Setup as follows:

audio -> butterlp -> downsample -> if > trigger {sendOSC '/freqlow', value}

similar for mid and high with butterbp and butterhp

Is the butterworth filter steep enough or should I use a FFT approach?

So far there is not much correlation with the music and the animation,
although that could also be the processing code.

Richard


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I got it sorted out. Posted a crappy video on my Youtube channel to
demonstrate the principle.
Csound splits the sound into low, mid and high and passes it via OSC to
processing for the visualisation.

http://www.youtube.com/watch?v=j6AZW9AK1Xs

Here is the csound code. 



-odac     ;;;RT audio out



sr     = 44100
ksmps  = 32
nchnls = 2
0dbfs  = 1

#define IPADDRESS	# "localhost" #
#define S_PORT 		# 9000 #

instr 1

a1,a2   diskin2 "./samples/hump.wav", 1, 0, 1, 0, 32
alp		butterlp a1, 250
abp		butterbp a1, 2000,800
ahp		butterhp a1, 3000
		outs (alp + abp + ahp)*2,(alp + abp + ahp)*2
		
ktrig	metro	25					;refresh 25 times per second

klp		max_k	alp, ktrig, 1
kbp		max_k	abp, ktrig, 1
khp		max_k	ahp, ktrig, 1

OSCsend   klp, $IPADDRESS, $S_PORT, "/freqLo", "f", klp
OSCsend   kbp, $IPADDRESS, $S_PORT, "/freqMid", "f", kbp
OSCsend   khp, $IPADDRESS, $S_PORT, "/freqHi", "f", khp


endin




i 1 0 200
e




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Hello Richard, 
You can also see the code of Processing?

;-()
e

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Hello Enrico,

Here's the (preliminary) Processing code.
This code also makes a small video of the visualisation.
Unfortunately there is no easy way to add sound to a video in Processing
AFAIK....
Startup de Processing sketch and then the csound code.
While it is running, press 'e' for ellipses, 'b' for bars, 'p' for picture,
etc. (see the code)

I did not include the hump.wav file used by the csound code, you can use any
wave file for that.

Richard

http://csound.1045644.n5.nabble.com/file/n5713589/lightorgan.zip
lightorgan.zip 


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