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Chapter 14 Specialized eects and utilities 260
Denoiser main parameters
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Threshold slider and eld: Drag to set the threshold level below which the noise signals
are reduced.
Locate a section of the audio where only noise is audible, then set the Threshold slider to a dB
value that lters only signals at or below this level.
•
Reduce slider and eld: Drag to set the amount of noise reduction applied to signals that fall
below the threshold. Aim for a Reduce slider value where noise reduction is optimal but little
of the music or vocal signal is reduced. Each 6 dB reduction halves the volume level, and each
6 dB increase doubles it.
Note: If the noise level of your recording is very high (more than −68 dB), reducing it to a level
of −83 to −78 dB should suce, provided no audible side eects are introduced. This reduces
the noise by more than 10 dB, to less than half its original volume.
•
Noise Type slider and eld: Drag to determine the type of noise you want to reduce.
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A value of 0 equals white noise—equal frequency distribution.
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Positive values change the noise type to pink noise—harmonic noise; greater bass response.
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Negative values change the noise type to blue noise—hissy tape noise.
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Graphic display: Shows how the lowest volume level signals in your audio material, which are
mostly or entirely noise, are reduced.
Denoiser smoothing parameters
Denoiser has the following smoothing parameters:
Time knob and field
Frequency knob
and field
Transition knob
and field
Denoiser smoothing parameters
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Frequency knob and eld: Rotate to adjust how smoothing is applied to neighboring
frequencies. If Denoiser recognizes that only noise is present on a certain frequency band, use
the Frequency parameter to smooth the neighboring frequencies to avoid artifacts. The higher
you set the Frequency parameter, the more the neighboring frequency bands are changed.
•
Time knob and eld: Rotate to set the time required to reach maximum noise reduction. This is
the simplest form of smoothing.
Note: The Time parameter also sets a release time, which is the time required for the signal
to revert to its normal level from the maximum noise reduction level. As with all Denoiser
parameters, the Threshold value determines the level that triggers the noise reduction process.
•
Transition knob and eld: Rotate to adjust how smoothing is applied to neighboring volume
levels. If Denoiser recognizes that only noise is present in a certain volume range, use the
Transition parameter to smooth the neighboring volume levels to avoid artifacts. The higher
you set the Transition parameter, the more similar-level values are changed.