Cedar DNS3000, Manual, Page: 17 / 44

CEDAR DNS3000 dialogue noise suppressor
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Case 3. Suppressing excessive reverberation
In many situations, the DNS3000 can suppress excessive reverberation. This can be useful in TV
production when you need to match the audio from a large recording studio or soundstage to
visual images set in a small room or other enclosed space. Suppressing reverberation can also
be beneficial in increasing the intelligibility of poor dialogue recordings.
The method used to suppress reverberation is as follows:
First, set the range in which the reverberation lies.
In general, reverberant spaces include soft materials that absorb high frequencies more rapidly
than middle and lower frequencies. Even bare rooms with hard walls include these materials:
they are the actors. Consequently, you will find that Low+Mid is almost always the most
appropriate combination of ranges for suppressing reverberation.
Second, set the Band Gain controls.
You should set all six Band Gain controls to -24dB. This will ensure that (provided the other
controls are set correctly) the DNS3000 processes the ‘tails’ of the sound without adversely
affecting the desired signal.
Third, optimise the Level control.
Starting at its minimum position (-80dB) increase the Level control slowly. At some point before
full noise suppression becomes apparent, you will hear the tails of louder sounds become
truncated. You can adjust the amount of truncation of the reverb using the Level control rather
than the Band Gain controls.
The final configuration may look like this: