Manual
Page 11
IN USE
DNS On/Off
Use S1 to switch processing on or off for the selected channel or group. Use SHIFT-S1
to switch processing on or off globally.
Learn
With Learn (S2) on for any channels or groups of channels, the DNS 8D continually
identies the power and spectral distribution of the noise present. When Learn is Off, the
noise identication is frozen at the last determined values. If Learn is Off when the unit is
switched off, the current noise measurement will be saved and recalled when the unit is
next switched On. Use SHIFT-S2 to switch Learn on or off globally.
Learn is not a method for taking a noise ngerprint and, in most circumstances, best
results are obtained by leaving it on permanently.
Attenuation
The default action of each encoder is to
adjust the amount of noise Attenuation
applied to the signal, as shown on the
left-hand side of each display. The
representation of the fader within the
display shows the current position of
the control, and the bar graph shows
the instantaneous amount of Attenuation
being applied. The solid bar shows the
average attenuation across all frequencies,
and the shaded bar shows the maximum
attenuation across all frequencies.
Bias
The encoder also provides control of the Bias, which is shown on the right-hand side
of each display. Click an encoder to enable adjustment of the Bias, and click it again
when you wish to switch back to controlling the Attenuation. The Bias is a ‘centre-zero’
control, and the fader shows its current position. Raise the Bias to increase the amount
of noise detected. This will allow the process to remove more noise, but may lead to
compression of the wanted audio and make the signal sound dry or gated. Lower the
Bias to decrease the amount of noise detected. This will allow the process to retain more
‘atmos’, but may allow noise to leak back into the wanted signal. In most cases, the
optimum value for the Bias is zero.
The right-hand bar provides information about the signal to noise ratio (SNR). The solid
bar shows the detected noise level, and the shaded bar shows the instantaneous signal
level; consequently, the difference between the heights of the solid and shaded bars
indicates the SNR.
• Learn and Bias determine what is detected as noise.
• Attenuation determines how much of the detected noise is suppressed.