Device setup
Frequency
The center frequency of the pilot band, adjustable from 5 Hz to
24 kHz in 1 Hz or 0.01 Hz increments. The chosen increment is
shown in light grey at the top right of the field. Select the field to
toggle between the different increments 1 Hz and 0.01 Hz.
Note: The set frequency also applies to the notch filter.
Threshold
Detection threshold for an external pilot signal of the set frequency,
adjustable in the range from:
▪ Analog signals: –117 dBu to +21 dBu in 1 dB increments
▪ Digital signals: -137 dBFs to 0 dBFS in 1 dB increments
On the bottom left of this field, the actual level is displayed in light
gray while the set threshold is displayed on the bottom right.
Once a pilot signal is detected, the corresponding LED indicator at
the top right illuminates green.
Quality
The Q of the notch filter, adjustable from 4 to 42 in increments of
1. The center frequency is fully attenuated (Þ –¥ dB).
Detection time
The maximum time interval that is allowed for an interruption of the
monitored pilot signal or digital clock (Lock) without an error
message being generated (0.1 ... 99.9 sec. in 0.1 sec.
increments).
Notch filter
Notch filter to remove the pilot signal from the program signal.
However, if activated, the notch filter remains active even if Input
monitoring is set to Off.
6.2.1.2 Input gain
Select «Gain» from the «Input management» menu to open the
subscreen.
An additional preamplifier stage (gain pot) is provided for each
input channel, either analog or digital.
This allows either analog or digital audio sources to be directly
connected to the respective amplifier input channels and presets
their upstream gain ranging from –57.5 dB to +6 dB in steps of
0.5 dB.
By factory default the input gain is set to 0 dB.
Two buttons are provided on the left side of the screen:
Input
gain
Master On/Off switch.
The on/off status is indicated by a change in color of
the button from gray to blue or vice versa.
Clear All gain settings are reset to factory default (0 dB)
while the function remains activated.
d&b D40 Reference manual 1.5 en 27
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