Orban OPTIMOD 8685, Operating Manual

Page: 246 / 357

5-2
TROUBLESHOOTING ORBAN MODEL 8685
•
Once D
IALNORM
is correct, be sure that your active preset is causing the 8685’s
L
OUDNESS
G
AIN REDUCTION
meter to indicate approximately 3 dB of gain reduction
on normal dialog. Adjust its
MB L
IMIT
D
RIVE
control if it does not. When the loud-
ness controller is operating normally, the 8685’s L
OUDNESS
L
EVEL
meter should be
peaking around 0 dB on dialog. If it is not and you are using a custom preset,
you might get better loudness control by slightly tweaking the
L
OUDNESS
T
HRESHOLD
control to make the
L
OUDNESS
L
EVEL
meter peak around 0, bearing in
mind that the correct setting is –10 dB for typical sound-for-picture processing. A
maximum variation of
±
1 dB will typically suffice.
If the 8685’s active
D
IALNORM
setting is not the same as the
D
IALNORM
set-
ting you are transmitting to your audience, the 8685’s Loudness Level
meter will be calibrated incorrectly, so even if the meter is peaking at 0
dB, loudness at the consumer’s receiver will not be correct.
Note that because the 8685’s Loudness Level meter shares the loudness
controller’s filterbank, the meter does not show the effect of the
L
OUDNESS
A
TTACK
control, which shapes the loudness controller’s gain re-
duction signal outside the loudness controller’s feedback loop. Therefore,
if you are using values of
L
OUDNESS
A
TTACK
below about 50%, the loud-
ness of transient events may be significantly higher than the Loudness
Level meter indicates.
Loudness Controller reduces transient punch of programming
•
Reduce the amount of fast gain reduction in the loudness controller by setting
the
L
OUDNESS
A
TTACK
control closer to 0 %. This will allow more short loudness
peaks to pass through without attenuation by the loudness controller. We be-
lieve that the range from 50% to 70% offers the most useful tradeoffs between
reducing punch and allowing irritating short-term loudness bursts to pass
through uncontrolled.
Transient loudness events (like esses in speech) sound obtrusively loud
•
Set the
L
OUDNESS
A
TTACK
control closer to 100%. This will allow the loudness
controller to do more de-essing but may decrease transient impact as a side ef-
fect.
•
Set the T
RANSIENT
E
NHANCE
control to 0 ms.
•
If “ess” sounds in speech (particularly with women’s voices) seem too pro-
nounced, one solution is to use the five-band structure and tune it for de-essing
(which we have done already in the TVxxx preets). Set the
S
PEECH
B5 T
HRESHOLD
control (for 2.0 processing) or
C
ENTER
B5 T
HRESHOLD
control more negative. For
surround processing, make sure that the B5 M
AIN
>C
ENTER
M
AX
+D
ELTA
GR is set to
10 dB or more. This will allow the center band 5 compressor to produce as much
extra gain reduction as needed to control “esses.”
Commercials too loud in sound for picture applications
•
Make sure that the Loudness Controller is activated on the preset that you are
using—the
L
OUDNESS
C
ONTROLLER
T
HRESH
control must not be set
O
FF
(see page
3-52) and is normally set to –10 dB.