User manual

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Audio processing and functions
Detect Silence
The Detect Silence function on the Advanced submenu of
the Audio menu searches for silent sections in an event
and either splits the event, removing the silent parts from
the project, or creates regions corresponding to the non-
silent sections. Proceed as follows:
1. Select the event in the Project window or the Audio
Part Editor.
You can select several events if you like, in which case you will be al-
lowed to make separate settings for each selected event.
2. Select “Detect Silence” from the Advanced submenu
of the Audio menu.
The Detect Silence dialog appears.
3. Adjust the settings in the Detection section to the left.
They have the following functionality:
4. Click the “Compute” button.
The audio event is analyzed, and the waveform display is redrawn to indi-
cate which sections will be considered “silent”, according to your set-
tings. Above the Compute Button the number of detected regions is
displayed.
• If you activate the “auto” checkbox next to the Compute
button, the audio event will be analyzed (and the display
will be updated) automatically every time you change the
settings in the Detection section of the dialog.
Please note that you should not activate this option when you are work-
ing with very long files, as this process might take some time.
Setting Description
Open
Threshold
When the audio level exceeds this value, the function will
“open”, i.e. let the sound through.
Set this low enough to open when a sound starts, but
high enough to remove unwanted noise during “silent”
sections.
Close
Threshold
When the audio level drops below this value, the function
will “close”. This value cannot be higher than the Open
Threshold value.
Set this high enough to remove unwanted noise during
“silent” sections.
Linked If this checkbox is ticked, Open and Close Threshold will
be set to the same value.
min. time
open
Determines the minimum time that the function will re-
main “open” after the audio level has exceeded the Open
Threshold value.
If the audio contains repeated short sounds, and you find
that this results in too many short “open” sections, try
raising this value.
min. time
closed
Determines the minimum time that the function will re-
main “closed” after the audio level has dropped below
the Close Threshold value.
Usually you would want to set this to a low value, to avoid
removing sounds.
Pre-Roll Allows you to have the function “open” slightly before the
audio level exceeds the Open Threshold value. In other
words, the start of each “open” section is moved to the
left according to the time you set here.
This is useful to avoid removing the attack of sounds.
Post-Roll Allows you to have the function “close” slightly after the
audio level drops below the Close Threshold value.
This is useful to avoid removing the natural decay of
sounds.
Setting Description