It is possible to remove noise from an audio object using the spectral mode, without the wanted signal being audibly influenced.
Spectral mode is useful for removing all kinds of short, random sounds in music such as popping, coughing, or even short drop-outs. Use the DeHisser or the DeNoiser to permanently remove noises such as humming, etc.
Step 1: First activate spectral view from the display options:
System options (shortcut “Y”) > Design > View options
Now you can see the audio signal in the spectral display.
The spectrogram displays the frequency proportions in a time curve. The volume of frequencies is visualized by a color code. A continuous sound is displayed by a pattern consisting of horizontal lines, which correspond to the sound components or overtones of the sound. Random distortions are represented as vertical lines.
Step 2: Switch the mouse mode to „Spectral Mode“.
Step 3: In our example we want to remove the percussive cracking noise which occurs shortly after the 4th bar. We need to zoom in on the object a little and highlight the interference by drawing a rectangle around it using the mouse.
Step 4: Use the handle to adjust the selected area.
You can listen to the results while editing.
Step 5: Click on “OK”. Now you should be able to see the result in the spectral display in the arranger window: The colored signal in the spectrogram was removed.
We use an interpolation technique to prevent there being any audible gaps: parts of the wanted signal around the interference are calculated at the highlighted section.
Tip: This also enables you to edit the left and right channels of the signal separately by selecting only the upper or lower part of the spectrogram from the highlighted rectangle.
We hope you enjoy using the spectral mode to restore audio material!
The Samplitude Team