Script for onset detection

Script for onset detection

"Can anybody provide me with a script that detects the onset of sound (i.e. the end of silence)."

You can create an Intensity contour and look for the first frame that is above some predefined threshold:

   To Intensity: 100, 0

   n = Get number of frames

   for i to n

      intensity = Get value in frame: i

      if intensity > 40

         time = Get time from frame: i

         writeInfoLine: "Onset of sound at: ", fixed$ (time, 3), " seconds."

         exit

      endif

   endfor

Since the intensity is computed with rather long windows, the result may be 0.01 or 0.02 seconds before the actual start of sound.