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Problems Specific to Dolby Digital Transmissions
Loudness incorrect compared to other Dolby Digital Transmissions
•
Review Setting Preset Loudness Correctly in Dolby Digital Transmission on page
2-42.
•
Be sure that the active D
setting you are transmitting to consumers. Use a device like the Dolby LM100
Loudness Meter to read out the Dialnorm you are transmitting to your audience
(or simply check the Dialnorm setting of your Dolby Digital encoder). See Setting
Preset Loudness Correctly in Dolby Digital Transmission on page 2-42.
•
Be sure that the 1101's input drive level is set to produce normal amounts of gain
reduction. See step 4 on page 2-36.
Note that only "TV" presets are designed to produce calibrated loudness
when used with the 1101's Dialnorm support. Any radio-style preset can
be edited to activate the Loudness Controller.
•
If the loudness controller is on, be sure that the L
set to 0 dB. (In software version 3.1, this was changed from –10 dB to be more in-
tuitive.)
This matches the loudness controller's threshold to the 1101's active
D
IALNORM
•
Once D
IALNORM
L
G
OUDNESS
AIN REDUCTION
on normal dialog. Adjust its MB L
ness controller is operating normally, the 1101'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
control to make the L
the correct setting is –10 dB for typical sound-for-picture processing. A maximum
variation of ±1 dB will typically suffice.
If the 1101's active D
ting you are transmitting to your audience, the 1101'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 1101'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
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
peaks to pass through without attenuation by the loudness controller. We be-
setting in the 1101 is the same as the D
IALNORM
value.
is correct, be sure that your active preset is causing the 1101's
meter to indicate approximately 3 dB of gain reduction
IMIT
L
OUDNESS
EVEL
setting is not the same as the D
IALNORM
A
control, which shapes the loudness controller's gain re-
TTACK
OUDNESS
A
control closer to 0 %. This will allow more short loudness
TTACK
OUDNESS
D
control if it does not. When the loud-
RIVE
OUDNESS
meter peak around 0, bearing in mind that
A
below about 50%, the loudness
TTACK
INSTALLATION
IALNORM
T
control is
HRESHOLD
meter should be
L
EVEL
T
OUDNESS
HRESHOLD
set-
IALNORM
2-55
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