Orban OPTIMOD-FM 8500S, Operating Manual

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OPERATION ORBAN MODEL 8500S
•
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.
Stereo Enhancer Controls
PC Remote Name Range
Amount 0.0 ... 10.0
In / Out Out / In
Ratio Lim 70 … 100%
Diffusion Off, 0.3 ... 10.0
Style 222 / Delay
Depth 0 … 10
Table 3-3: Stereo Enhancer Controls