Orban OPTIMOD 6300 Operating Manual page 82

2-28
INSTALLATION
L) Press N . Then adjust DO1 100% set the desired digital output level corre-
EXT
sponding to 100% modulation, in units of dB below full-scale.
See the notes in step (10.D) on page 2-25.
If you use a TVAxxx preset (intended to process audio for analog preem-
phasized FM aural carriers), loudness will be correct compared to an
Orban processor for analog TV (like Optimod 8282 or 8382) if you set the
6300's AO 100% level so that the 6300's test tone generator, when set to
400 Hz and 100%, produces 100% modulation of the aural carrier. To
make this work, you must set the D
>D
(S
ETUP IALNORM
M) Navigate to S
ETUP
through (L) for Digital Output 2.
N) Skip to step 14.
12. Set digital configuration and output level when driving a Dolby Digital
channel. (If driving a Dolby Digital channel, do not skip this step!)
[Skip this step if you are not driving a Dolby Digital channel.]
The D
IALNORM parameters that you set below are relevant to applications where
the 6300 is driving a Dolby Digital transmission channel. They allow you to en-
sure that your audio has the correct loudness.
The 6300 works very easily with Dolby Digital® transmission systems if you do
one crucial thing: You must tell the 6300 what value of Dolby Digital Dialnorm
metadata you are transmitting to your audience. This will prevent your transmis-
sion from being too loud or quiet compared to other correctly set up Dolby Digi-
tal transmissions.
The 6300 is designed to work smoothly with Dolby Digital. In essence, the Dolby
Digital Dialnorm metadata sets an invisible volume control that is cascaded with
the volume control in the consumer's receiver. To produce the same loudness as
other properly set up transmission channels, the 6300 needs to be aware of the
Dialnorm value you are transmitting to the consumer. The 6300 uses this value in
two ways:
 It adjusts the sensitivity of the 6300's Loudness Level meters so that when the
Loudness Level meters are indicating 0 LK on speech material, loudness is cor-
rect at the receiver. This means that you can use the 6300's Loudness Level
meter as a reference if you are modifying a factory preset and want to ensure
correct loudness at the consumer's receiver. See Figure 1-1: Simplified Block
Diagram of Dialnorm Control on page 1-2.
 It scales the output level of the 6300's presets so that the level will be correct
for the Dialnorm value you are transmitting to the consumer. To do this, it
sets the gain of a hidden level control cascaded with the 6300's L
control. This gain adjustment is before the 6300's look-ahead limiters and
O L
UTPUT EVEL CONTROLS
room of the Dolby Digital transmission channel regardless of the Dialnorm
IALNORM
>R O
)
EF UT
> IO C > D C
ALIB IGITAL ALIB
. This arrangement allows you to use the full head-
ORBAN MODEL 6300
R O to O
EFERENCE UTPUT
> DO2 C
ALIB and repeat steps (A)
IMITER
FF
D
RIVE