User manual

20 Introduction
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Spectral Cleaning
Spectral Cleaning in the "Remove" section can be useful for editing
video recordings of concerts or theater plays, for example, where a
single cough in the audience threatens to ruin an otherwise beautiful
effect. Spectral Cleaning can be used to remove short distortions
such as coughing, passing cars, a whistle, crackling or short drop
outs.
Here's how it works: The clearly audible noise has a different acoustic
signature than the rest of the material, otherwise it wouldn't be clearly
audible. Based on this signature, the noise can be identified and
filtered. After it has been identified, the audio material's frequency
spectrum is analyzed before and after the disturbance. Based on this
"acoustic environment", frequencies are calculated that can be used
to fill the gap that was created after filtering out the disruptive
signature. Ideally, a simulation of the "normal" background acoustics
replaces the cough, almost as if it were removed magically.
Let's start:
• First, set the play cursor roughly to the position of the distortion.
• Open the Spectral Cleaning Editor.
• Try to select the distortion using the marking tool in the Editor.
• Once you've marked the distortion, click on "Play". The algorithm
becomes active immediately: The selected area is filtered out and
replaced with frequency material from the surrounding "acoustic
environment".