TC Electronic LM2 User Manual - Edit Page
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3. Target defines the “12 o’clock” value of the Radar
meter when LM2 is connected to a Mac or a PC running
the Icon application.
Loudness Unit
LUFS
All measurements of program loudness and sliding
loudness are shown in units of LUFS, that is, in Loudness
Units on the absolute scale. This is the normal setting
for the Loudness Unit parameter, that we recommend for
most applications.
Loudness Range is always shown in units of LU, because
it is basically a measurement of ‘range’ or of the distance
between a high and a low loudness level.
LUFS/LU
This setting is similar to the ‘LUFS’ setting, except that
the Radar display uses an LU scale rather than an LUFS
scale, on the Icon. There is no difference between the
LUFS and LU/LUFS settings, when the LM2 is used in
stand-alone mode.
LU
In this setting, measurements of program loudness
and sliding loudness are shown in units of LU, that is,
in Loudness Units on a relative scale. The 0 LU is by
definition the target loudness level, such as -23.0 LUFS.
So by selecting ‘LU’, one can immediately see if a
loudness level is above the target level (e.g. +1.2 LU) or
below (e.g. -3.4 LU).
Loudness Std.
Options: BS.1770-2, Leq(K) or Cnt of Grav.
The Program Loudness measure is always rooted in
the ITU-R BS.1770 loudness model. This parameter
sets measurement gating. Note that the parameter only
influences Program Loudness, and not Sliding Loudness
or Loudness Max.
BS.1770-2
This setting reflects the latest revision of ITU-R BS.1770.
Relative gate at -10 LU, safety gate at -70 LUFS.
Leq(K)
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.
The standard setting from early versions of TC radar
meters.
Relative gate at -20 LU, safety gate at -70 LUFS.
International Standards
Note how the three Loudness Standard settings generally
return the same Program Loudness result for Narrow
Loudness Range (“NLR”) programs, such as commercials
and pop music, but can differ significantly with Wide
Loudness Range (“WLR”) programs such as film, drama,
acoustical music etc.
For an update on international standards, check for
new versions of this manual, or download the Loudness
Glossary available at www.tcelectronic.com/loudness
This is the situation as of August, 2011:
Japan, Canada, Brazil, China, Europe and most other
countries specify the use of BS.1770-2 to make Program
Loudness perform well across genres. BS.1770-2 enables
the meter reliably to focus on foreground sound, and to
transparently control loud commercials. ARIB (Japan)
specifies BS.1770-2 in TR-B32. EBU (Europe) specifies
BS.1770-2 in EBU R128 and in associated Tech Doc
3341.