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OPTIMOD 6300 DIGITAL
Once D
IALNORM
L
G
OUDNESS
AIN REDUCTION
on normal dialog. Adjust its MB L
ness controller is operating normally, the 6300's L
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
T
control to make the L
HRESHOLD
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 6300's active D
ting you are transmitting to your audience, the 6300'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 6300's Loudness Level meter shares the loudness
controller's filterbank, the meter does not show the effect of the
L
OUDNESS
duction signal outside the loudness controller's feedback loop. Therefore,
if you are using values of L
ness of transient events may be significantly higher than the Loudness
Level meter indicates.
This issue does not affect the 6300's BS.1770-2 Loudness Level Meter.
A BS.1770 loudness meter indicates higher loudness than expected with some pro-
gram material
Set the BS.1770 L
essing Preset and is available from the 6300's front panel (in the Modify menu).
Using the BS.1770 safety limiter will prevent the meter from reading above the
preset threshold but may cause subtle loudness pumping because of limitations
in the BS.1770 algorithm. See BS.1770 Safety Limiter on page 3-13 for a more de-
tailed discussion.
Your Optimod has a built-in BS.1770-2 long-term (gated) meter with a 10-second
integration time. This should agree with an external BS.1770-2 meter that is set
up with a 10-second gated integration time, a "Relative" scale (i.e. LK or LU), and
a reference level equal to your Optimod's active D
CBS Loudness Controller reduces transient punch of programming
Reduce the amount of fast gain reduction in the loudness controller by setting
the L
OUDNESS
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.
Unexpected gain pumping
The BS.1770 safety limiter can produce subtle gain pumping because of limita-
tions in the BS.1770 algorithm. BS.1770 safety limiter-induced gain reduction is
is correct, be sure that your active preset is causing the 6300's
meter to indicate approximately 3 dB of gain reduction
IMIT
OUDNESS
setting is not the same as the D
IALNORM
A
control, which shapes the loudness controller's gain re-
TTACK
OUDNESS
T
control closer to 0 LK. This control is in the active Proc-
DNS
HR
A
TTACK
control closer to 0 %. This will allow more short loudness
D
control if it does not. When the loud-
RIVE
L
OUDNESS
L
meter peak around 0, bearing in
EVEL
A
TTACK
below about 50%, the loud-
IALNORM
value.
TROUBLESHOOTING
EVEL
meter should be
OUDNESS
set-
IALNORM
5-7
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Troubleshooting
