Orban OPTIMOD-FM 8600, Operating Manual

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OPERATION ORBAN MODEL 8600
original L–R to create stereo enhancement. (See
Stereo Enhancement
on page 3-8
for more information.)
Both modes have gating that operates under two conditions.
•
The two stereo channels are close to identical in magnitude and phase.
In this case, the enhancer assumes that the program material is actually
mono and thus suppresses enhancement to prevent the enhancement
from exaggerating the undesired channel imbalance.
•
The ratio of L–R / L+R of the enhanced signal tries to exceed the threshold set by
the L-R / L+R Ratio Limit control.
In this case, the enhancer prevents further enhancement in order to pre-
vent excess L–R energy, which can increase multipath distortion.
The stereo enhancer has the following controls:
Amount sets the maximum spatial enhancement.
Enhancer In / Out bypasses the stereo enhancer.
O
UT
is equivalent to setting the
A
MOUNT
to 0.
L-R / L+R Ratio Limit sets the maximum amount of enhancement to limit the
amount of multipath distortion that the stereo enhancement can add. However, if
the original program material exceeds this limit with no enhancement, the enhancer
will not reduce it.
Diffusion applies only to the
D
ELAY
enhancer. This control determines the amount
of delayed L–R added to the original signal.
Style sets one of two stereo enhancer types:
222
or
D
ELAY
.
Depth sets the delay in the delay line. It applies only to the
D
ELAY
enhancer.
AGC Controls
The AGC is common to the two-band and Five-Band structures.
Five of the AGC controls are common to the Intermediate Modify and Advanced
Modify screens, with additional AGC controls available in the Advance Modify
screen, as noted in the following table.
These controls are explained in detail below.
Each Factory Preset has a
L
ESS
-M
ORE
control that adjusts on-air loudness by altering
the amount of processing.
L
ESS
-M
ORE
simultaneously adjusts all of the processing
controls to optimize the trade-offs between unwanted side effects.
If you wish, you may adjust the Advanced Modify parameters to your own taste. Al-
ways start with
L
ESS
-M
ORE
to get as close to your desired sound as possible. Then