Fft would be useful – mapping the amplitude of bands of frequencies to whatever (perhaps you’re doing this). You could also measure the centroid, which correlates to a brightness measure of the sound. From the centroid you can also determine the “bigness” of sound ie. how “full” it sounds at a given moment. – I’ll look thru some of my code and forward the maths – its simple but I can’t remember this early in the morning – and it shouldn’t be too hard to write as a patch (and not in C). You could also determine the “segmentation” of the sound using env~ ie. finding out where phrases begin and end, the length of phrases etc. Think someone out there has written a rhythm estimator patch or external which could be handy.

Cheers, iain

-----Original Message-----
From: Andre Schmidt [mailto:andre@vju.info]
Sent: Saturday, 11 May 2002 8:51 AM
To: PD-LiST
Subject: [PD] audio analyze ideas ?

hi,

i'm making an audio 2 visual patch and was wondering if any1 has any ideas what i could analyze on audio to be visualized. @ the moment i got:

- the frequency of loudest freguenzy

- volume

- L/R balance

and ofcourse  fiddle~ & bonk~

(for the 1st use i'm only analyzing guitar/voice)

thnx

-andre