EVS Broadcast Equipment SA
25
MONITORING
Meta_Prgm_Sel
Here you select which set to metadata you want to monitor in the
status menu (all items with an MD prefix).
Loudness_type
Here you set the loudness measure type of the loudness level output
sine. Possible are:
▪
1770-2+Dial
: ITU-R BS.1770-2 standard including
dialogue normalization
▪
1770-1+Dial
: ITU-R BS.1770-1 standard including
dialogue normalization
▪
1770-2
: ITU-R BS.1770-2 standard without dialogue
normalization
▪
Leq(A)
: A-weighting standard
▪
Off
: no loudness monitoring
The loudness measurement standard EBU R 128 [2] was released in
2010, primarily for European audiences. This specification builds
upon ITU
‐
R BS.1770
‐
1 [1] by defining three standard measurement
windows: momentary (400 ms), short term (3 s), and integrated
(entire program).
R 128 also introduced the concept of level gating. Level gating is an
alternative gating strategy to speech gating (the method performed by
Dialogue Intelligence
) that utilizes a two
‐
stage approach: an absolute
gate, followed by a relative gate. Level gating makes no attempt to
base loudness measurements on a dialogue anchor element, but
instead bases its measurement on energy.
R 128 introduces new terminology for the units of loudness
measurement: LUFS (loudness units relative to full scale). LUFS is
functionally equivalent to LKFS, but represents a confusing
discrepancy between the ITU and EBU.
Another new concept introduced by R 128 is the Loudness Range
(LRA) descriptor. Loudness Range is essentially a measure of the
spread of loudness measurements throughout a program, measured in
Loudness Units (LU). Loudness Range is intended to determine the
amount of preencoding compression required, for broadcasters that do
not use metadata
‐
based DRC (for example, for MPEG
‐
1 Layer II
audio). Dolby formats such as Dolby Digital and Dolby Digital Plus
use Metadata based DRC, and therefore, LRA is irrelevant for these
formats.
Loud_Prgm
Here you select of which dolby program you want to monitor the
loudness level of.
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