Hi Oeyvind,

If I understand your question correctly, the spectral flux feature will
give you the information you need.

http://en.wikipedia.org/wiki/Spectral_flux

I'm not sure what the best way to do this in Csound would be. I'm a bit
out-of-touch with Csoundy things at the moment. Maybe you could do it
natively with the pvs opcodes and some maths, or maybe a new opcode
would be needed. Alternatively, maybe it would be good to write a VAMP
plugin host for Csound, this would make available a couple of SF
implementations along with a whole load of other useful features...

Jamie

On Mon, 2008-04-21 at 14:05 +0200, Oeyvind Brandtsegg wrote:
> Hello
> 
> I'd like to do transient analysis of an audio signal in Csound,
> preferably analysis in realtime. I'm unsure about how to go about
> this. I did a simple test of taking the centroid (pvscent) and looking
> for steep ascending slopes. This sort of works, but not perfect. Maybe
> it could be combined with amplitude (ascending) slope detection, but
> I'm sure there are better ways to do this.
> It would be useful to have degrees of "transient-ness", and also to
> have the signal gently slope back to zero as the analyzed audio
> stabilizes on a "steady state" spectrum.
> Maybe a new pvs opcode ?
> 
> Oeyvind
> 
> 
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