d&b D12 Software - Manual (Page 28)

Input Monitoring
According to the European Standard EN 60849 "Elektroakustische
Notfallwarnsysteme" (equivalent to international standard IEC 60849
"Sound Systems for Emergency Purposes") the complete signal chain
needs to be monitored. Therefore the "d&b Input Monitoring"
functionality allows the detection of an incoming pilot signal to be
inserted into the signal chain in front.
Important notes on Input Monitoring
Input Monitoring can supervise the D12 analog or digital inputs. It is not
linked to the channel input routing, therefore it is possible to monitor an
input connector while it is not routed to an amplifier channel.
Depending on the selected input mode of the D12 the following Input
Monitoring modes are functional:
D12 Input mode Analog Pilot Digital Pilot Digital Lock
analog Yes No No
digital Yes Yes Yes
Tab. 3: Input Monitoring modes depending on D12 Input mode
The submenus "Input A" and "Input B" within the "Input Monitoring"
menu are related to the D12's input connectors according to the
following conventions:
D12 input mode is set to "analog"
The analog input connectors INPUT A/B of the D12 can be monitored
for incoming pilot signals.
When setting the D12 to input mode analog it is not possible to monitor
the digital input or whether the digital input has locked to the incoming
digital audio signal (as indicated in the table above - Tab. 3). In this case
an error message "A/B: Input monitoring Fault” is given out on the LCD.
D12 input mode is set to "digital"
In this case "Input A/B" in the "Input Monitoring" menu are related to
the AES channel. The analog input connectors INPUT A/B or the
DIGITAL AES/EBU input connector of the D12 can be monitored for
incoming pilot signals or whether the digital input has locked to the
incoming digital audio signal (Clock).
Example:
The D12 input mode is set to digital while the analog input connectors
are monitored for incoming pilot signals (Analog Pilot). The program
signal is fed to the digital input while for emergency calls the D12 will be
switched (routed) to the analog inputs of the D12 and the program fed
to the digital input will be interrupted.
MUTE A/B
Note: As the MUTE A/B switches isolate the D12 digital controller from the
power amplifiers the MUTE A/B switches do not affect the input
connectors of the D12 and therefore "Input Monitoring" remains
working (also refer to the D12 Hardware manual in section "Controls
and indicators – MUTE A/B”).
Input Monitoring off Selecting "Input Monitoring" and pressing the encoder enters the
submenu.
D12 Software manual (Firmware V2.x.x) (5.5 EN) Page 28 of 36