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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