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OPTIMOD-PC
If you are not driving a Dolby Digital channel, set D
This defeats Dialnorm processing, which can be confusing in applications
other than driving Dolby Digital channels.
• you have adjusted the 1101's D
are transmitting.
The 1101's D
ting in the C
by the D
G
LOBAL
Dialnorm setting specified in the C
The following steps assume that you are driving the Dolby Digital encoder with
the 1101's Digital Output 1, although either output can be assigned to be the Di-
alnorm reference output.
A) Navigate to I/O M
a) Set the D
in the Dolby Digital metadata you are transmitting to your audience. (Refer
to the manufacturer's instructions for the Dolby Digital encoder you are
using for information on how to set the value of Dialnorm in your
transmitted metadata.)
b) Set the R
When you are using D
digital outputs as the "Dialnorm reference output." In this step, you have
made digital output 1 the Dialnorm reference output.
When a given output is the Dialnorm reference output, adjusting its as-
sociated level control does not change output loudness. Instead, it sets
the maximum peak level appearing at this output with respect to 0 dBfs,
which allows you to compensate for transmission channels that introduce
peak overshoots. For example, if you lower the O
dBfs to –2 dBfs, the 1101 automatically reduces the gain following its
look-ahead peak limiter by 2 dB and simultaneously increases the drive
into the peak limiter by 2 dB. Hence, the average output level does not
change but the maximum peak output level is constrained to –2 dBfs.
This unconventional arrangement results from the 1101's handling of
D
IALNORM
change the 1101's output level control freely without causing your on-air
loudness to be incorrect with respect to other Dolby Digital transmissions.
The "neutral" setting of the
matches the loudness of 1101 version 1.x processing) is –19 dB.
B) Set the P
RE
C) To optimize the 1101's interface with a Dolby Digital encoder like the Dolby
DP569, set the following parameters in the D
lows:
a) S
R
AMPLE
b) W
L
ORD
Dolby Digital encoder.
IALNORM
value can be set in two places: There is a global set-
IALNORM
tab of the I/O mixer, which will be overridden
ONFIGURATION
setting in the active processing preset if this is not set to
IALNORM
. All factory processing presets are configured to use the global
> C
IXER
ONFIGURATION
R
control so it is the same as the Dialnorm value
IALNORM
EFERENCE
control to D
S
EFERENCE
OURCE
IALNORM
—if you have set D
control to F
-E
MPHASIS
= 48 kHz, which is the standard Dolby Digital sample rate.
ATE
= 24 bits, which is the recommended setting for driving a
ENGTH
IALNORM
R
to match the Dialnorm you
EFERENCE
tab.
ONFIGURATION
.
O
IGITAL
UTPUT
, you must assign one of the 1101's two
UTPUT
correctly on the 1101, you can
IALNORM
D
control (i.e., the setting that
IALNORM
.
LAT
1 C
IGITAL
ONFIGURATION
INSTALLATION
O
to O
.
UTPUT
FF
1.
control from 0
box as fol-
2-27
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