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Re: onset detection

Hi Andy,

You'll probably want to look into the large literature on onset detection algorithms, perhaps starting from the MIREX competitions?

I've linked the most recent here:

http://www.music-ir.org/mirex/2007/index.php/Audio_Onset_Detection_Results

Onset detection based on overall energy change over 100 msec blocks is not necessarily a very general strategy. Further, p-centre is potentially a rather complicated phenomena with a further literature and not to be confounded with physical onset detection. Not sure you'll find a simple relation between perceptual and physical onset based on a simple single band energy change detection function, especially over a variety of timbres.

best,
Nick



--On 26 December 2007 11:31:05 -0600 robert gjerdingen <r-gjerdingen@xxxxxxxxxxxxxxxx> wrote:

On Dec 25, 2007, at 5:57 AM, Andrew McGuiness wrote:

First, the script looks for negative slope in the energy curve of
the sound, with energy calculate by averaging 100 millisecond
blocks, to eliminate very local fluctuations. If the sound file is
recorded clean, with no spill, this works well to identify the
general area of the onset.