The Nyquist Noise Gate plug-in has a number of features and settings that allow it to be both effective and unobtrusive. A Noise Gate may be used after the Audacity Noise Reduction effect to further reduce the noise level during periods that should be silent.Where there is low level intermittent noise of a similar type to the actual recorded sound (for example, if sound from a distant television or radio is audible during pauses in a speech recording) a Noise Gate can make the pauses more silent.When noise reduction by other methods causes unacceptable degradation of the sound quality, a Noise Gate can reduce the noise level to some extent between sounds without affecting the actual recorded sounds.Be sure in Quality Preferences to enable 32-bit Default Sample Format and to disable "High-quality" dither - more explanation here.
Example: Noise Gate can eliminate dither noise that may be evident in silent passages in 16-bit audio files.
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