OPTIMOD-PC
OPERATION
3-9
the loudness of other stations or sources. When the 1101 is otherwise set up cor-
rectly (so that it is cognizant of the
D
IALNORM
metadata you are transmitting to
viewers), its TVxxxx presets achieve this goal most precisely by exploiting the loud-
ness controller. The “radio-style” presets are crafted to match the target loudness as
well as can be achieved without use of the loudness controller.
If you want more consistent loudness from a “radio-style” preset, set its
L
OUDNESS
C
ONTROLLER
T
HRESH
control to –10 dB, turn up its MB
L
IMITER
D
RIVE
control until the loudness controller gain reduction meter indicates about
3 dB of gain reduction with typical program material, and save the result
as a user preset.
Protection Limiting
OPTIMOD-PC has an advanced look-ahead limiter that is competitive with the best
mastering peak limiters. The
L
OOK
-A
HEAD
L
IMITER
preset allows you to use OPTIMOD-
PC as a mastering-style look-ahead limiter.
Studio AGC
You can use OPTIMOD-PC as a studio AGC and STL protection peak limiter. In a typi-
cal application, OPTIMOD-PC substitutes for the AGC in an Optimod at the transmit-
ter and provides protection limiting for the STL, which can be flat or preemphasized
at 50 or 75
µ
s. The AGC is turned off in the transmitter-side Optimod.
If the STL has at least 16 bits of dynamic range, it is often practical to
drive it with the AGC alone, allowing additional headroom for the over-
shoots that OPTIMOD-PC’s peak limiter would have otherwise removed.
Defeating the peak limiter will remove about 16 milliseconds of delay
from the signal path.
OPTIMOD-PC’s AGC uses the same dual-band, window-gated, matrix technology as
the AGCs in Orban’s 2300, 5300, 8300, 8382, 8400, 8500, 9300, and 9400 Optimods.
Therefore, it can accurately substitute for the AGCs in these devices and can help
maintain an all-digital signal path throughout the facility. Because OPTIMOD-PC’s
AGC is more advanced than the AGCs in Orban’s 2200, 8200, and 9200 Optimods,
OPTIMOD-PC can upgrade the performance of these older products when substi-
tuted their AGCs.
Moreover, because OPTIMOD-PC supports presets that be recalled by remote con-
trol, it can be automatically synchronized to the presets on-air at a transmitter-side
Optimod when presets are dayparted.
To achieve this match:
A)
Recall one of the STUDIO AGC presets. There are three such presets, for flat,
50 µs, and 75 µs preemphasized STLs. See
page 3-24.
You must also configure the peak limiter to match the preemphasis that
your STL uses. See step 5 on page 2-25.
Summary of Contents for Optimod-PC 1101
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