Orban OPTIMOD 6300 Operating Manual page 83

OPTIMOD 6300 DIGITAL
setting. In addition, changing Dialnorm adds a hidden offset to the L
T
HRESHOLD
that the CBS loudness controller's and BS.1770 safety limiter's gain reductions
do not change when D
These scale factors adjust themselves automatically so that the loudness
of the consumer's receiver is the same regardless of the settings of the
6300's O
maximum peak output level with respect to 0 dBFS. This allows you to
compensate for transmission channels that introduce peak overshoots.
For example, if you change the O
–6 dBFS, the drive level into the look-ahead limiters automatically in-
creases by 6 dB. Meanwhile, the threshold of the loudness controller and
the sensitivity of the 6300's Loudness Level meter decrease by 6 dB.
Hence, the RMS drive level into the Dolby Digital encoder stays the same,
the loudness controller produces the same amount of gain reduction,
and the Loudness Level meter continues to peak at 0 dB.
To change the 6300's output loudness, adjust its D
the MB L
D
IALNORM
6300's Loudness Level meter and without changing the amount of gain
reduction in the loudness controller. Adjusting MB L
both the Loudness Level meter's indication and the amount of gain re-
duction in the loudness controller.
D
IALNORM
The MB L
ware.
If the BS.1770 R
still scales the CBS and BS.1770 Loudness Meters, but it does not change
the drive into the peak limiters. Hence, the output loudness is only cali-
brated to the loudness meters if that output's O
to 0 dB.
Your Dolby Digital transmission's loudness will automatically be correct if:
 you use a "TV" factory preset (Table 3-3 on page 3-31),
 you have adjusted the AI R
ates with normal amounts of gain reduction (step 5 on page 2-21 and step 7
on page 2-23),
 you have assigned the D
driving the Dolby Digital channel or analog television transmitter.
If you are not driving a Dolby Digital channel, set D
O
. This defeats Dialnorm processing, which can be confusing in applica-
FF
tions other than driving Dolby Digital channels.
While it is possible to use the 6300's analog output to drive a Dolby Digi-
tal transmission channel, calibrating the 6300's output loudness for a
given D
digital output and the Dolby Digital encoder's input with one of the
6300's digital outputs and to maintain unity gain in the link.
and BS.1770 T
HRESH
is changed.
IALNORM
%
100
control, whose only purpose is to set the 6300's
UTPUT
D
IMITER RIVE control in the active Processing Preset. Adjusting
changes loudness without changing the indication on the
is a system control that is available from the 6300's front panel.
D
control is available only from 6300 PC Remote soft-
IMITER RIVE
S
EFERENCE OURCE
or DI R
EF
IALNORM
IALNORM value requires that you drive the link between the 6300's
controls' displayed settings, which ensures
%
100
control from 0 dBFS to
UTPUT
IALNORM
IMITER
is set to O , the D
FF IALNORM
L
UTPUT
EF controls so that the processing oper-
O
(step (0 below) to the 6300 output
UTPUT
INSTALLATION
OUDNESS
value or adjust
D
changes
RIVE
R
EF control
control is set
EVEL
O
IALNORM UTPUT to
2-29