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3-18
OPERATION
Protection and AGC Presets
tomize your sound using the information in the Protection Limiter, Two-Band and
Five-Band sections that follow.
Each factory preset has full L
cluding the source presets from which they were taken and the nominal L
setting of each preset. Some of the Five-Band presets appear several times under
different names because we felt that these presets were appropriate for more than
one format; these can be identified by a shared source preset name.
Important! If you are dissatisfied with the sound available from the fac-
tory presets, please understand that each named preset is actually 19 pre-
sets that can be accessed via the L
to trade off the amount of dynamic range reduction against processing
artifacts and side effects. Once you have used L
ited preset as a User Preset.
Do not be afraid to choose a preset other than the one named for your program-
ming if you believe this other preset has a more appropriate sound. Also, if you
want to fine-tune the frequency balance of the programming, feel free to use Basic
Modify and make small changes to the Bass, Mid EQ, and HF EQ controls. OPTIMOD-
PC lets you make changes in EQ (and stereo enhancement) without losing the ability
to use Less-More settings.
Of course, L
to go back to it. There is no way you can erase or otherwise damage the
Factory Presets. So, feel free to experiment.
If a preset has "2B" or "2BAND" in its name, it will activate the Two-Band structure.
(The Protection presets are two-band as well.) Other presets use the Five-Band struc-
ture.
AGC+[FLAT, 50 µs, 75 µs] LIMITER: These presets allow OPTIMOD-PC to serve as a
studio AGC, substituting for the AGC in an Optimod at a radio or television transmit-
ter and providing protection limiting for the STL that links the output of OPTIMOD-
PC to the input of the Optimod at the transmitter. See Studio AGC on page 3-8.
Choose the preset that matches OPTIMOD-PC's preemphasis setting, visible in the
C
page of the I/O Mixer (see step 5 on page 2-24). This step explains
ONFIGURATION
how to choose OPTIMOD-PC's preemphasis setting to match your STL.
The 50 µ
and 75 µ
S
S
serves only as a subtle high frequency limiter that uses bands 4 and 5 to perform a
few dB of fast gain reduction with program material having strong high frequency
content. Band 5 operates without stereo coupling. This way, HF limiting triggered by
high frequency energy in one audio channel will not modulate high frequencies in
the opposite channel.
The F
preset is tuned so that it does not normally trigger gain reduction in
LAT
OPTIMOD-PC's five-band compressor — the Optimod at the transmitter should be
the processor that performs this multiband compression.
All AGC presets use the look-ahead limiter to prevent overloading the STL on peaks.
, the 50 µ
Compared to F
LAT
capability. The table shows the presets, in-
-M
ESS
ORE
-M
ESS
-M
is still available for the unedited preset if you want
ESS
ORE
presets have been tuned so that the five-band compressor
and 75 µ
presets progressively reduce the drive level
S
S
ORBAN MODEL 1100
control. Try using this control
ORE
-M
, save your ed-
ESS
ORE
-M
ESS
ORE
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