crystal standard configuration User Manual
Version: 6.4.0/4
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11. Appendices
11.2
System Reference Levels
DIN
SMPTE
Relative System Level
- 27
- 38
Analog Reference Level
15
24
Operating Level (analog)
+6 dBu
+ 4 dBu
Operating Level (digital)
- 9 dBFS
-20dBFS
The
Relative
System Level
and
Analog Reference Level
are options defined in the configuration. They
combine to set the operating levels (analog and digital) for the system.
With
Relative System Level
(dBFS) you define the relative working point internally within the system. This
value can be calculated with the formula "RSL = - digital headroom - 18" or "RSL = working point -18dB".
For example, the working point (0 dBr) for the ARD (German Broadcasters’ Network) is at -9 dBFS. From this
follows a
Relative System Level
(dBFS) of -27. Note that the working point is important as dynamics and
limiter modules refer to this value. When the threshold value is set to 0 dB, the absolute level equals the working
point.
If required, the
Relative System Level
and
Analog Reference Level
can be edited using the ON-AIR
Designer. Start by opening the existing configuration, and then edit the
Relative
System Level (dBFS)
and
Analog Ref Level (dBu)
options in the 'Tree Definition' (shown below).
ON-AIR Designer Tree Definition: "System -> Definition -> Parameter = Meter"
Then save and transfer the edited configuration to the DSP Core. For more information about the configuration
tool, please see the "ON-AIR Designer User Guide". This is available from the
Downloads
area at
(after
Login
).
