11.0

Effects and effect plug-ins 97
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Dehisser
The Dehisser eliminates regular ”white” noise typically produced by
analogue tape recordings, microphones, pre-amplifiers, or
converters.
Noise level: Set the Dehisser’s input threshold as precisely as
possible. Low settings result in incomplete deletion of the hissing. An
incomplete deletion of the hissing produces artifacts and should be
avoided. High settings produce dull results. Useful signals (e.g. the
blow of a wind instrument) that are similar to hissing are also filtered
away. If the level of the hissing is low, the setting is no problem.
Audio type: Lets you set the audio material that is to be edited; the
algorithm is adjusted accordingly.
Noise reduction: Set the attenuation of the hissing in decibels. It
often makes sense to reduce the hissing by only 3 to 6 dB in order to
keep the audio material sounding natural.
Removed hiss: To test your results, you can listen to the filtered-
away part of the music prior to downloading or burning onto a CD.
Remember, this is for test purposes only.
Quality: The processing quality can be set in two stages. You can
use this to precisely adjust the values in the dialog for standard
quality adjustment without skipping playback, and can then select a
higher quality for final burning.
Adaptive: The value for the noise level parameter is set automatically
by determining the hiss contained in the signal. If the noise level value
is changed, its effect becomes relative, i.e. the resulting value is
determined from the automation as well as the noise level controller
settings.
One advantage of this is that you no longer have to set the noise level
value manually and that this value can also be adjusted later if the
noisy portion fluctuates, e.g. if you use music tracks with differing
hiss levels within one project.
If the noise level is constant, then a better result may be obtained
manually (adaptive off). However, the noise level value must then be
set precisely.