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Linear Acoustic AERO.one V3 User Guide
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Dialogue Level: sets the dialogue loudness anchor (also known as dialnorm). Values
vary between -31 and -1 and are correctly set with an ITU loudness meter such as a
Linear Acoustic LAMBDA or LQ-1000 or equivalent.
•
DRC: built-in dynamic range control system (also known as Line Mode (dynrng) and
RF Mode (compr), driven by presets such as "Film Standard".
Note that as they are intimately connected, you must set the dialogue level properly in or-
der for the DRC (dynamic range control) system to perform as intended.
3.6.1
Audio Coding Mode
Also known as acmod, this value is shown, for example as 3/2L. This means three front
channels, two rear channels, and LFE (i.e. the channel that feeds the sub woofer). Without
metadata, it should be set to 3/2 and the LFE turned on so that the upmixing included
with the AERO.one can be relied upon to keep all programming in 5.1 channel surround
sound.
3.6.2
Dialogue Level
Properly setting the Dialogue Level parameter ensures that the dialogue volume heard by
the consumer (or average level in programs without dialogue) is consistent between pro-
grams. Contrary to popular belief, there is no one "correct" value for unprocessed audio.
As the value indicates the average dialogue loudness of a program and different programs
will very likely have different loudness, they will also then have different dialogue level val-
ues. Correct values are found by measuring each program.
This section assumes no metadata is available and that the AERO.one is relied upon to
match levels between programs. Only in this scenario is it then appropriate to set a single
dialogue level value on the AC-3 encoder as the AERO.one is doing the job of matching
each program to a single loudness value.
To set Dialogue Level:
1.
Ideally, using either a Linear Acoustic LAMBDA or LQ-1000, or a Dolby LM100
will make this very easy because it displays the actual metadata from the encoded
stream and the measured dialnorm value in real time, and the encoder can be
quickly adjusted via its front panel.
2.
Note that as long as the dialnorm metadata value and the measured audio match
on average, setup is correct regardless of the actual final value of dialnorm. By "on
average" we mean that over time the values should match more than they do not
match, and some movement is OK (these are the good dynamics of the program
making it through). The only audio that will produce a non-varying result is test
tone (or horrendously over-aggressive processing) best to avoid both.
18
Applications
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