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Editing audioAdvanced audio processing ► Removing silence

The Remove Silence command detects sections of audio that fall below a given loudness threshold, and replaces those sections with absolute silence. Remove Silence gives you the option of actually deleting the silent sections from the selected audio clips, splitting long audio clips into a greater number of shorter audio clips.
Using Remove Silence to split long audio clips into smaller ones opens a variety of creative possibilities.
The parameters in the Remove Silence dialog box are used to specify exactly what you mean by silence. More precisely, Remove Silence employs what is called a digital noise gate. The gate is a type of filter, it passes data through, or stops it from passing through, according to certain criteria. Parameters in the dialog box specify the conditions under which the gate is opened and under which it closes again.
The value in this field is the interval of time after the volume reaches the Open Level for the gate to fully open. Opening the gate gradually produces a fade-in effect instead of an instant on-off sound.
The minimum time for the gate to stay open. Hold Time is useful when you’ve set high open and close levels, for example, when your source signal is very loud. Noise gates set this way tend to react to repeated percussive passages (such as drum rolls) by repeatedly opening and closing; this can sound unpleasant. By setting a hold time, you can ensure that the gate stays open long enough during percussive passages.
The amount of time after the Close Level is reached that the gate actually closes. This lets the tail end of sounds pass through without being clipped.
2.
Choose Process > Apply Effect > Remove Silence to open the Remove Silence dialog box.
Figure 355. The Remove Silence dialog box.
4.
Select the Split Clips check box to delete the silent sections of audio.
5.
Click OK to remove silence from the selected data.
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