The Noise Reduction effect dramatically reduces background and broadband noise with a minimal reduction in signal quality. This effect can remove a wide range of noise, including tape hiss, microphone background noise, 60-cycle hum, or any noise that is constant throughout a waveform.
The proper amount of noise reduction depends upon the type of background noise and the acceptable loss in quality for the remaining signal. In general, you can increase the signal-to-noise ratio by 5 to 20 dB and retain high audio quality.
To achieve the best results with the Noise Reduction effect, apply it to 16- or 32-bit audio with no DC offset. With 8-bit audio, this effect cannot reduce noise below - 45 dB, which is very audible. (To achieve a lower noise floor with 8-bit audio, upsample the file to 16 bits, apply the Noise Reduction effect, and downsample the file back to 8 bits.) With a DC offset, this effect may introduce clicks in quiet passages. (To remove a DC offset, select the Center Wave preset provided by the Amplify/Fade effect.)
Adjusting frequency-specific settings with the Noise Reduction graphs: A. Noise floor B. Reduction graph C. Original audio D. Processed audio
To reduce noise added by a sound card during recording, start the recording with a second of silence. After recording is complete, use that silence as the Noise Reduction Profile, and then remove it from the complete recording. In some cases, this process can increase dynamic range by 10 dB.
To reduce noise:
In Edit View, select a range that contains only noise and is at least half a second long.
To select noise in a specific frequency range, use the Marquee Selection tool. (See Selecting audio frequencies in Spectral View.)
In the Effects tab of the Organizer window, expand Noise Reduction, and double-click Capture Noise Reduction Profile.
In the waveform display, select the range from which you want to remove noise.
In the Effects tab of the Organizer window, double-click Noise Reduction.
Set the desired options.
Точнее работает эта штука вот так.
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