Orban OPTIMOD 6300 Operating Manual page 160

3-18
OPERATION
The instructions below describe how to correctly set the loudness of user presets
that you create. You must use 6300 PC Remote for these adjustments. See To Create
or Save a User Preset on page 2-19.
There are two major philosophies of loudness control, one presented in ATSC Rec-
ommendation A/85 and the other in EBU Recommendation R 128.
ATSC A/85: If you wish to ensure that dialog levels are consistent from one program
segment to the next, use the 1101's CBS loudness meter as a reference for adjusting
a user preset's loudness. In this case, we prefer relying on the CBS Loudness Control-
ler to do final loudness control and turning the BS.1770 Safety Limiter off. Consis-
tent loudness of the "anchor element" (usually dialog) is the goal suggested in ATSC
Recommendation A/85, which is the basis for CALM Act compliance, and we prefer
this goal to strictly relying on the BS.1770-2 loudness meter.
EBU R 128: If you wish to ensure that integrated loudness as measured on a
BS.1770-2 meter is consistent from one piece of program material to the next, use
your Optimod's BS.1770-2 loudness meter as a reference. In this case, you may wish
to active your Optimod's BS.1770 Safety Limiter, which will constrain BS.1770-2
loudness with a 10-second integration time from exceeding the setting of the
BS.1770 T
control. However, note that R128 encourages mixing to achieve
HRESHOLD
a wide dynamic range, where some material may considerably exceed the target
loudness when measured on a "short-term" (three-second integration time; un-
gated) BS.1770-2 meter. Moreover, R 128 requires online loudness control to be de-
feated if upstream material is known to be pre-processed such that the integrated
loudness of each program segment (per BS.1770-2) is identical to the active dialnorm
value with a ±1 dB window. Use your Optimod's P
loudness processing.
In sound-for-picture applications that use a Dolby Digital transmission channel to
the consumer's receiver, you can use the 6300's L
Bs.1770-2) as a reference for adjusting a user preset's loudness. (See Using the ITU
BS.1770 and CBS Loudness Meters to Measure Loudness Controller Performance
starting on page 3-79.) These meters' calibrations track the 6300's active D
value, which is either the D
preset whose D
IALNORM
Processing Preset if this value is not set to G
The controls to which the following procedure refers are described later in Section 3.
A) Make sure that the AI R
using the analog or digital input) is set up correctly (step 5 on page 2-21 or
step 7 on page 2-23).
B) Make sure that the 6300's active D
value you are transmitting to consumers' receivers (step 12.B)a) on page 2-30).
C) If the AGC is turned on in the preset, adjust the AGC D
AGC is producing the desired amount of compression. We recommend 10 dB
or less with normal levels.
IALNORM value in the active Setup (which applies to any
value is set to G
LOBAL
LOBAL
or DI R
control (depending on whether you are
EF EF
IALNORM
ORBAN MODEL 6300
-T
preset to defeat
ASS HROUGH
L
OUDNESS EVEL meters (CBS and
) or the D
IALNORM value in the active
.
value is the same as the Dialnorm
RIVE control so that the
IALNORM