TC Electronic DB4 MKII - Manual (Page 91)

LM6
English Manual 87
genres. BS.1770-2 enables the meter reliably to
focus on foreground sound, and to transparently
control loud commercials. ARIB (Japan) speci-
fies BS.1770-2 in TR-B32. EBU (Europe) speci-
fies 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.
United States: Page 11 of ATSC A/85 (May 25,
2011) references ITU-R BS.1770-1, even though
BS.1770-2 was in effect at that time. The same
page also says that “All referenced documents
are subject to revision”. The wording is ambigu-
ous and it’s up to the reader to decide whether
or not a relative gate (the difference between
BS.1770-1 and BS.1770-2) is applied when mea-
suring Program Loudness. The “Leq(K)” set-
ting in LM2 disables the relative gate, while the
setting “BS.1770-2” includes a relative gate at
-10 LU. The BS.1770-2 setting is better across
genres and for controlling loud commercials.
Check in at www.atsc.org to see if the CALM act
has forced ATSC to make up their mind.
Target Level in United States is -24 LUFS, mea-
surement gating not clearly defined.
Measure Scale
This parameter can be set to either “Loudness
Units, LU” or “Loudness Full Scale, LUFS”. Note
that “LKFS” is the same as “LUFS”.
When “LUFS” is selected, the numbers in the
outer ring of the Radar page apply. When “LU” is
selected, numbers are shown around a “0” de-
noting LU Reference.
LU Reference
0 LU Equals sets the loudness required to obtain
a 12 o’clock reading on the outer ring, which is
the same as the border between green and yel-
low on the Radar page. 0 LU is the reference to
aim at.
Peak Indicator
This parameter sets at which level the peak indi-
cator will be invoked.
Setup
Momentary Range
EBU +9 or EBU +18
Set range on the radar meter
EBU mode meters are able to display to show
two different momentary displays: One with
a narrow loudness range intended for normal
broadcast and denoted “EBU +9”, and one with
a wide loudness range intended for film, drama
and wide range music denoted “EBU +18”.
The “EBU +9” setting gives a momentary meter
range from -18 to +9 LU, while the “EBU +18”
settings gives a momentary range from -36 to
18 LU.
Radar Speed
Radar Speed controls how long time each ra-
dar revolution takes. Select from 1 minute to 24
hours. You may “zoom” between the settings, as
long as the history isn’t reset. Pressing the Reset
key resets the meter and descriptor history.
Radar Resolution
Radar Resolution sets the difference in loudness
between each concentric circle in the Radar be-
tween 3 and 12 dB. Choose low numbers when
targeting a platform with a low dynamic range
tolerance. You may “zoom” between the set-
tings, as long as the history isn’t reset.
Low Level Below
Low Level Below determines where the shift be-
tween green and blue happens in the outer ring.
It indicates to the engineer that level is now at
risk of being below the noise floor.
Alert Indicator
Stereo Integrity
The indicator indicates a lack of stereo integrity
based on measuring the difference of left/right
inputs. If there is a consistent difference be-
tween left and right over a prolonged time, the
LED is lit.
5.1 Integrity
In this mode, Integrity is based on the signal lev-
els on L,R,C,LS and RS channels. If one or more
of the channels drop out over a prolonged time,
the LED is lit.