TC Electronic SYSTEM 6000 MKII Algorithm Manual

115
lM6
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LM6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
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.
TargetLevelinthesecountriesis-23LUFSor-24LUFS,
measurementgatingat-10LU.
Note 1: Because the Sliding Loudness measurement is
completelyun-gated,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.
Note 2:LM6makesuseofoptimizedstatisticsprocessing
in order to display a sliding loudness value (a prognosis) as
quicklyaspossibleafterareset.
Loudness Max
Loudness Max displays the maximum loudness registered
since the meter was last reset. Loudness Max is an
especiallyusefulparameterwhencheckingandnormalizing
short duration programs such as promos and commercials.
BCAPrulesfromtheUKisanexampleofusingLoudness
Max as an efficient instrument to reduce listener complaints
regarding loud commercials. While Program Loudness is
adequate to normalize a consistent mix, Loudness Max
may be used as a second line of transparent defense
against overly short and loud event.
Target
Range:-36LUFSto-6LUFS
The parameter specifies the loudness level to generally aim
at. It affects a number of functions and displays in LM6,
and must be set according to the standard you need to
comply with. Current broadcast standards require Target to
beintherangebetween-26and-20LUFS.Forinstance,
EBUR128callsfor-23LUFSwhileATSCA/85specifies
-24LUFS.
The Target parameter affects these LM6 functions and
displays:
1. Target sets the reference point for loudness
measurementsinLU.IftheLoudnessUnitparameterisset
toLU,ProgramLoudness,SlidingLoudnessandLoudness
MaxwillbeshowninLUrelativetoTarget.OnTarget
measurementswillconsequentlyread“0.0LU”.
2.Targetdefinesthe“12o’clock”valueoftheRadarmeter.
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.

TC Electronic SYSTEM 6000 MKII Specifications

General

Brand	TC Electronic
Model	SYSTEM 6000 MKII
Category	Computer Hardware
Language	English