TC Electronic DB6, Руководство пользователя

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Loudness Wizard
DB6 English Manual (2014-10-07) 105
Loudness Wizard – ALC page
Fig. 44.: Loudness Wizard – ALC page
Loudness section
Target Level parameter
Use the Target level parameter to set the tar-
get level for Loudness adjustment. The unit is
shown as “LFS”, which denotes “LKFS” as well
as “LUFS” (the two are identical).
For normal broadcast, the value should typically
be between -18 and -24 LFS. Note that the dis-
tance between this value and Limit Threshold on
the Limit page is a quality-defining factor – i.e.
the standard headroom of the station. To ensure
decent audio quality, headroom should be 16 dB
or higher.
In broadcast environments working with a fixed
Dialnorm value, Target Level can be set 1 to 3 dB
higher than the static Dialnorm value in order to
prevent level jumps between channels, and to
have the Dolby DRC system sound better, if in-
voked.
Stereo Offset parameter
While the BS.1770 measurement works for ste-
reo as well as for 5.1 signals, a different Target
Level may be better in some distribution scenari-
os: When end-listener downmix is relied on, hav-
ing the same Target Level for stereo and for 5.1
can create systematic level jumps at consumers
listening to stereo. Therefore, ALC6 includes a
novel automatic discrimination function, allowing
for slightly different Target Levels to aim at if the
input format is stereo or if it is 5.1.
The Stereo Offset parameter allows a smooth
and automatic Target Level change when the
input is stereo. For instance, if Target Level is
set to -21 LFS and Stereo offset is set to -3 LU,
ALC6 uses a Target Level of -21 LFS for 5.1 pro-
grams, but a Target Level of -24 LFS for stereo.
Max Reduction parameter
Use the Max Reduction to set the maximum
number of dBs the processor is allowed to at-
tenuate the signal.
If this parameter is set to 0.0 dB, level reduction
is disabled regardless of other settings such as
Correction.
Max Boost parameter
Use the Max Boost parameter to set the maxi-
mum number of dBs the processor is allowed
to boost the signal. If this parameter is set to
0.0 dB, level boost is disabled regardless of oth-
er settings such as Correction.
Avg. Rate parameter
Use the Avg. Rate parameter to set the speed
by which gain changes as a result of loudness
variations.
The rate adapts to the signal, and it takes the
Slow Window and Pre Process parameter set-
tings into account, so this parameter indicates
an average number.