Re: onset detection (robert gjerdingen )

Subject: Re: onset detection
From:    robert gjerdingen  <r-gjerdingen@xxxxxxxx>
Date:    Wed, 26 Dec 2007 11:31:05 -0600

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. > Andy, For a counter example, you might look at an old paper of mine, “Smooth” Rhythms as Probes of Entrainment,” _Music Perception_ 10 (1993): 503-508 (< gjerdingen/Papers/PubPapers/SmoothRhythms.pdf>). There the perceived onsets occur at positive-to-negative zero crossings of the second derivative of energy. This would be in a region of all positive slope, if I'm not misunderstanding your method. Best wishes for the Holidays, Bob Gjerdingen Northwestern Univ. School of Music

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