User Manual

WAVELAB
9 – 196 Off-line processing
• It affects where the zero crossings appear, which in turn affects the smoothness
of splices between audio files.
• Certain processing options do not give optimal results when performed on files
with a DC offset.
Checking for and eliminating DC Offset
1. Select the wave you want to check and fix.
2. Select “Eliminate DC Offset” from the Process menu.
A dialog appears stating the amount of DC offset.
3. Click OK or Cancel.
Waveform Restorer
This lets you remove intermittent clicks and pops in an audio file. First
make a selection encompassing the artefact you want to remove, then ap-
ply one of the available methods. Usually, you will have to use a high zoom
factor to be able to locate and select the undesired element.
The Waveform Restorer lets you select one of several available restora-
tion methods. The selected method is described in the dialog.
• Note that if you want a more direct control of the process, you can instead
use the Audio error detection and correction dialog for a more “hands on”
way of restoring audio files. See “Audio error detection and correction” on
page 631.
Time Stretch
Time stretch is an operation that allows you to change the length of a re-
cording without affecting its pitch. Actually the standard term “time stretch”
is a bit misleading since you can of course also make the material shorter.
This function is most often used to make a section of audio fit in with some
other material. Therefore this dialog is set up exactly for that. You select the
material to be stretched and use the options in the dialog to find a stretch
factor (the “Percentage”). This is done by specifying the desired length, or
the desired tempo, all according to what the situation requires.