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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 digital noise gate parameters are described in the following table.
Parameter...
Meaning...
Open Level (dB)
The loudness threshold for opening the noise gate. The gate
officially opens when loudness rises above this level, although
it can open earlier because of the Attack Time.
Close Level (dB)
The loudness threshold for closing the noise gate. The gate
officially closes when loudness falls below this level, although
it can stay open later because of the Release Time.
Attack Time (ms)
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.
Hold Time (ms)
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.
Release Time (ms)
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.
Look Ahead (ms)
The value in this field causes the gate to open slightly before
the sound reaches the Open Level so you don’t lose the
sound’s attack.
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