manual

124 Audio File editing
5.5.8 Spectrum editor
This specific tool window allows you to select and perform operations on an Audio File via
its audio spectrum.
It uses high quality linear-phase filters to process a spectrum selection both in the time do-
main and in the frequency domain. This can be useful for advanced audio restoration tasks
like removing noise from a specific source in a recording, for example.
Making and editing selections
Spectrum editing can only be performed when a waveform is first displayed in Spectrum
display mode and when a spectrum selection is defined. To activate the Spectrum editor,
click on the Spectrum edit tool in the command bar (or via Workspace > Specific tool
windows > Spectrum Editor). This displays the Spectrogram if this is not already the case
(see The Spectrum display).
To select a region, point and drag to define a rectangle. The region selection defines a time
and a specific frequency range. This allows you to edit and process audio both in the time
domain and in a specific frequency domain, as opposed to standard wave editing which
always operates in the full frequency domain.
Notes on spectrum selections:
When defining a region in a stereo file, a "mirrored" region is automatically created in
the other channel. To define a region in only one channel, press [Shift] while drawing
the region.
Once you have a region selected, if you place your mouse cursor inside the region,
a pop-up appears showing the currently set frequency range (Hz) and the time range
(seconds/milliseconds) for the selection.
A selected region can be moved in any direction by clicking and dragging the region
with the cursor.
If you press [Shift] whilst dragging a region, it only moves horizontally thus retaining
your selected frequency range. If you press [Ctrl]/[Command] + [Shift] the region
only moves vertically thus retaining the selected time range.
You can resize a region by placing the mouse cursor at the edges of the region (so that
a double-arrow appears) and then clicking and dragging.
To remove a region that you have drawn, click anywhere else on the waveform and it
disappears.
If you have defined a region as a Source or Target, it can be selected at any time to
create a new selection using the same dimensions.
Spectrum editor functions
The Spectrum Editor has the following parts:
WaveLab 7