Orban OPTIMOD 6300 Operating Manual page 26

1-2
INTRODUCTION

value of D
IALNORM
audience.
Setting Output Loudness: To set the 6300's output loudness, adjust its
D value or adjust the MB L
IALNORM
Preset. Both methods cause 6300's O
 Adjusting D
IALNORM changes output loudness without changing the indication
on the 6300's CBS Loudness Level meter or the amount of gain reduction in
the loudness controller. The peak limiter's gain reduction will change. This is
the preferred method if the 6300's loudness controller is active (as it is in most
"TV" presets) because it has the smallest effect on the sonic texture of the
6300's audio processing.
 Adjusting MB L
IMITER
the amount of gain reduction in the loudness controller and peak limiter.
The 6300's output level control (100% O
output loudness. Its only purpose is to set the 6300's maximum peak out-
put level with respect to 0 dBFS, which allows you to compensate for
transmission channels that introduce peak overshoots, which all lossy co-
decs do. For example, if you lower an O
to –2 dBFS, the 6300 automatically reduces the gain following its peak
limiter by 2 dB and simultaneously increases the drive into the peak lim-
iter by 2 dB. Hence, the average output level does not change but the
maximum peak output level is constrained to –2 dBFS. This unconven-
tional arrangement results from the 6300's handling of Dialnorm—if you
have set D
IALNORM
put level control freely without causing your on-air loudness to be incor-
rect with respect to other transmissions.
If you are processing for a Dolby Digital distribution channel and wish to
Figure 1-1: Simplified Block Diagram of Dialnorm Control
that the Dolby Digital encoder is transmitting to your
D
IMITER RIVE
L
UTPUT EVEL
D
RIVE changes the Loudness Level meter's indication and
UTPUT
UTPUT
correctly on the 6300, you can change the 6300's out-
ORBAN MODEL 6300
control in the active Processing
meter indication to change.
L
EVEL ) does not change
L
EVEL control from 0 dBFS