Input Management; Input Monitoring - d&b audiotechnik D40 Reference Manual

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6.2.1 Input management

The «Input» screen provides access to the following input-related
functions:
▪ Input monitoring (Mon)
▪ Input gain (Gain)
▪ Fallback
▪ Override
The on/off status of each function is indicated by change in color
of the button from gray to blue or vice versa.
Below these buttons, there is a graphical representation of the
actual input level and input monitoring.

6.2.1.1 Input monitoring

Select «Input monitoring» from the input management menu to
open the submenu.
The input monitoring function enables the amplifier to monitor all
signals, either from analog and/or digital signal sources, fed to the
respective input (Þ «Input»). If one or several signals fail, a
corresponding error can be generated and reported.
At the signal source, an additional external pilot signal (sine wave
signal) is added (summed) to the source signal.
Within the amplifier, this pilot signal can be detected (Þ «Mode»
Þ «Pilot») using an adjustable bandpass filter (Þ «Freq.»).
As long as the pilot signal is permanently and safely present within
the given pilot band, this is an indication that the incoming signal
path is faultless.
For this purpose, the amplifier determines the level of the pilot
signal within the pilot band. The result is then compared with an
adjustable reference threshold set by the user (Þ «Threshold»). If
the level of the pilot signal falls below the reference threshold, a
time-related error can be generated (Þ «Detection time»).
The pilot signal can be removed from the source signal (program
signal) at any time using a notch filter (Þ «Notch filter»).
When input monitoring is used with digital inputs, it is also possible
to detect whether the device has locked to the digital source signal
or not (Þ «Mode» Þ «Lock»).
Finally, the Input monitoring mode «DS data» permanently
monitors the meta data information sent by a d&b DS-Series
device.
Input monitoring settings
Input
Input selector ( D1 - D4, A1 - A4).
Mode Depending on the selected input (analog or
digital), the following mode settings are
available:
Input
A1 - A4
D1 - D4
Input monitoring
You can select and set every channel individually. See the table
above for all available channel modes.
The error status is also indicated on the «Home» screen. A
corresponding message (Input monitoring fault) will be issued.
Device setup
Mode
Pilot Lock DS data
Yes No No
Yes Yes Yes
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