Sound: To TextGrid (silences)...

A command that creates a TextGrid in which the silent and sounding intervals of the selected Sound are marked.

Settings

Silence threshold (dB)
determines the maximum silence intensity value in dB with respect to the maximum intensity. For example, if imax is the maximum intensity in dB then the maximum silence intensity is calculated as imax - silenceThreshold; intervals with an intensity smaller than this value are considered as silent intervals.
Minimum silent interval duration (s)
determines the minimum duration for an interval to be considered as silent. If you don't want the closure for a plosive to count as silent then use a large enough value.
Minimum sounding interval duration (s)
determines the minimum duration for an interval to be not considered as silent. This offers the possibility to filter out small intense bursts of relatively short duration.
Silent interval label
determines the label for a silent interval in the TextGrid.
Sounding interval label
determines the label for a sounding interval in the TextGrid.

Algorithm

First a copy of the sound is bandpass filtered between 80 and 8000 Hz to remove especially the low frequency noise that can have a significant influence on the intensity measurement but does not really contribute to the sound. Next the intensity of the filtered sound is determined. Finally the silent and sounding intervals are determined from the intensity curve.

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© djmw, April 6, 2016