Table of Contents
Advertisement
grams and commercials, and to set loudness
metadata in delivery if so required.
For delivery or transmission of AC3 format, the
metadata parameter "dialnorm" should reflect
Program Loudness.
The easiest way to handle multiple broadcast
platforms is to normalize programs at the sta-
tion to a certain value, thereby being able to take
advantage of the normalization benefits across
platforms, at the same time enabling static meta-
data.
Loudness measurements in LM6 are all rooted in
ITU-R BS.1770. However, subtle differences exist
between different regions of the world. Therefore
LM6 also includes the "Loudness Standard" pa-
rameter. Be sure to set this parameter correctly
for compliance in your region.
The Program Loudness target is more or less the
same for broadcasters around the world, espe-
cially when taking the measurement differences
into account. Target numbers range between -24
and -22 LUFS.
Like with Loudness Range and Loudness Max,
the meter should be reset before measuring Pro-
gram Loudness.
Sliding Loudn. setting
Unlike Loudness Range, Program Loudness and
Loudness Max, Sliding Loudness is a continu-
ously updated measure that doesn't need to be
reset. This type of descriptor is especially use-
ful when "mixing by numbers" – i.e. when there
is no access to the extremely informative radar
display.
When mixing by numbers, having Program Loud-
ness as one descriptor and Sliding Loudness
as the other displays simultaneous information
about the full program side by side with the most
recent loudness history.
Because the Sliding Loudness measurement
is completely ungated, it may also be used to
spot-check sections of a program complying
to "raw" ITU-R BS.1770 and the first revision of
ATSC A/85.
LM6 makes use of optimized statistics process-
ing in order to display a sliding loudness value (a
prognosis) as quickly as possible after a reset.
English Manual (2014-03-05)
Loudness Max setting
Loudness Max displays the maximum loudness
registered since the meter was last reset. Loud-
ness Max is an especially useful parameter when
checking and normalizing short duration pro-
grams such as promos and commercials.
BCAP rules from the UK is an example of us-
ing Loudness Max as an efficient instrument to
reduce listener complaints regarding loud com-
mercials. While Program Loudness is adequate
to normalize a consistent mix, Loudness Max
may be used as a second line of transparent de-
fense against overly short and loud event.
Loudness section
Loudness Std. parameter
The Program Loudness measure is always root-
ed in the ITU-R BS.1770 loudness model. This
parameter sets measurement gating. Note that
the parameter only influences Program Loud-
ness, and not Sliding Loudness or Loudness
Max.
ITU BS.1770-3 setting
This setting reflects the latest revision of ITU-R
BS.1770. Relative gate at -10 LU, safety gate at
-70 LUFS.
Leq(K) setting
This setting reflects the original version of ITU-
R BS.1770. No measurement gate besides from
at safety gate at -70 LUFS, so the user doesn't
need to precisely start and stop a measurement
in order to avoid bias from complete silence.
Cnt of Grav. setting
The standard setting from early versions of TC
radar meters. Relative gate at -20 LU, safety gate
at -70 LUFS.
LU Reference parameter
The LU Reference parameter defines the loud-
ness required to obtain a "12 o'clock" reading on
the outer ring of the Radar display, which is the
same as the border between green and yellow
on the Radar.
Loudness Unit parameter
LUFS setting
All measurements of program loudness and slid-
ing loudness are shown in units of LUFS – that
LM6
57
Advertisement
Table of Contents
