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Chapter 11 Special 153
If you use the Denoiser too aggressively, the algorithm will produce artefacts, such as
“glass noise” which—in most cases—are less desirable than the existing noise.
Therefore, there are three parameters for reducing this effect in all three dimensions of
sound:
• Time Smoothing
This is the simplest form of smoothing. This parameter sets the time required by the
Denoiser to reach (or release) maximum reduction.
• Frequency Smoothing
This parameter sets a factor for smoother transition of the denoising to neighboring
frequencies. More precisely: If the Denoiser recognizes that only noise is present in a
certain frequency band, the higher the Frequency Smoothing parameter is set, the
more it will also change the neighboring frequency bands to avoid “glass noise”.
• Transition Smoothing
This parameter sets a factor for smoother transition of the denoising to neighboring
volume levels. More precisely, if the Denoiser recognizes that only noise is present in
a certain volume range, the higher the Transition Smoothing parameter is set, the
more it will also change similar level values to avoid “glass noise”.
The Graphic Display
The graphic displays how the lowest volume levels of your audio material (which
ideally is only noise) will be reduced.
Exciter
An Exciter generates high frequency components that are not part of the input signal.
It’s a nonlinear distortion process, that resembles overdrive and distortion effects. As
opposed to these processes, however, the distorted signal is mixed with the dry signal.
In addition, the harmonics generator is fed by a highpass filtered version of the input
signal. This means that the artificial harmonics have frequencies at least one octave
above the lowest frequency being allowed through by the highpass filter. Human
hearing can not easily distinguish artificial harmonics in very high frequency ranges.