Orban OPTIMOD-FM 8600, Operating Manual

Page: 258 / 397

3-78
OPERATION ORBAN MODEL 8600
BS.1770 Safety Limiter ON/OFF
activates or defeats the BS.1770 Safety Limiter,
which is applied only to the digital radio processing. This control affects the behav-
ior of the digital output receiving the HD feed (see step 10 on page 2-32).
BS.1770 Loudness Control Threshold sets the threshold of the BS.1770 Safety
Limiter and the calibration of the BS.1770 loudness meter.
When the BS.1770 Safety Limiter is OFF, the
BS.1770 L
OUDNESS
C
ONTROL
T
HRESHOLD
sets the calibration of the BS.1770 Loudness Meter, such that
“0” LK/LU on the meter corresponds to the loudness appearing at the
Digital Output assigned to “HD.” This calibration is only correct if the
Digital Output
100% P
EAK
L
EVEL
control is set to 0 dBFS.
When the BS.1770 Safety Limiter is
ON
, this calibration is correct regard-
less of the setting of the Digital Output
100% P
EAK
L
EVEL
control.
Unique HD Audio Controls
Included with each preset in the “HD Limiting” page in Advanced Control. The only
HD controls described in this section and shown in Table 3-13 have no FM analog
counterparts. There are many other HD controls that have analog FM counterparts.
These are described in earlier parts of Section 3 in this manual.
FM  HD Control Coupling determines if audio controls affecting the HD equalizer
and HD multiband limiter will track their counterparts in the FM analog processing
chain or if the HD and FM controls can be adjusted separately. Each preset contains
its own setting for this control, so some presets may be coupled while others are in-
dependent. The
FM

HD
mode causes almost all HD controls to track the settings of
their FM counterparts. Only the controls in the
HD L
IMITING
page are adjustable sepa-
rately. The
I
NDEPENDENT
mode allows you to set the HD equalizer and HD multiband
compressor/limiter audio controls independently of their FM counterparts.
I
NDEPENDENT
mode exposes HD controls that are hidden in
FM

HD
mode.
If a given preset has certain HD and FM controls set differently, setting the
FM

HD
C
ONTROL
C
OUPLING
to
C
OUPLED
will immediately cause the HD controls to take the
same settings as their FM analog counterparts.
On 8600 PC Remote, there are buttons available on the button bar to toggle the
FM

HD
mode. When the
FM

HD
mode is
I
NDEPENDENT
, a button on the toolbar
Function Control Name Values
HF Shelving Filter HD EQ Gain 0…–6 dB; 0.5 dB steps
HD EQ Freq 2…– 20 kHz; 1/6-octave steps
Look-Ahead Limiter HD Limiter Drive 0…+12 dB; 1.0 dB steps
HD De-Esser HD De-Ess Off, –23.5…0
FM

HD Control Coupling FM

HD Control Coupling FM

HD; Independent
Bass Clipper HD Bass Clip Threshold –6.0 … 0.00
HD Speech Bass Clip Thr –6.0 … 0.00
Bass Clip Shape 0 … 10
Table 3-13: Unique HD Audio Controls (found in HD Limiting page)