Noise Gate |
The Noise Gate effect is the most basic of all dynamics-processing effects. For years, engineers have been using noise gates to eliminate subtle noise, tape hiss, and low-level electrical hum from recordings.
A simple noise gate removes all audio below a set threshold level. When recording a sound, there is often an audible noise floor during silent breaks. When your sound source is much louder than this background noise, it is simple to set an accurate threshold level that will remove noise from the silent breaks.
You
can also use the Graphic Dynamics
plug-in to perform advanced noise gating.
Open the Sonic Foundry Noise Gate dialog.
Choose a preset from the Name drop-down list, or adjust the controls as desired:
a. Drag the Threshold level fader to set the level below which signals will be removed. Noise levels are typically near 40 dB.
b. Drag the Attack time slider to set the time it takes the gain of the gate to change from zero to one once the level rises above the threshold.
A low Attack time preserves percussive attacks. Higher values cause sounds to slowly swell up in volume.
c. Drag the Release time slider to set the time it takes the gain of the gate to change from one to zero once the level falls below the threshold.
A long Release time preserves natural-sounding decays; otherwise long decays will be cut off.