Cedar DNS3000, Manual, Page: 12 / 44

CEDAR DNS3000 dialogue noise suppressor
8
Stand-alone operation
The DNS process divides a signal into a large number of well defined bands. Sophisticated digital
filters analyse each of these bands and suppress the noise independently in each. The
innovative design of this filter bank allows you to control the unit using relatively few front panel
controls.
Channel Selectors
Your first job will be to select the channel that you wish to set up. You can select CHAN1 or
CHAN2 individually, or link them by pressing both buttons in quick succession, whereupon the
settings of the channel selected first are copied to that selected second. (You unlink the
channels by pressing just one of the buttons.)
Range Selectors
Next, you should identify the frequency range or ranges in which the noise lies. You can press
each of the Range Selector buttons individually, or combine them to choose any one of six
possible processing ranges:
Low 20Hz - 400Hz
Mid 200Hz - 6kHz
High 4kHz - 18kHz
Low + Mid 20Hz - 6kHz
Mid + High 200Hz - 18kHz
Full Range 20Hz - 18kHz
To select Low + Mid or Mid + High, press the appropriate two buttons simultaneously or in quick
succession. To select Full Range, press the Low and High buttons simultaneously or in quick
succession.
Selecting a range concentrates all of the filters within the DNS3000’s filter bank across that part
of the audio spectrum.
Level control
Your next job will be to identify the noise level of the audio.
With the appropriate channel(s) and range(s) selected, pull all six Band Gain controls and the
Level control down fully. Now increase the Level slowly. At first, you will hear very little happen
but, at some point determined by the noise content of the recording, you will hear the noise
disappear. You should attempt to find the point at which this occurs.
Placing the Band Gain controls in their lowest position ensures that maximum processing will
occur as you increase the Level control, thus making identification of the noise easier.