21
DOLBY D+ DEC
(refer to appendix 2 for decoded Dolby Digital channel mapping)
Ad_mix
If the decoder receives an input stream with AD program content, mixing
occurs according to the input stream mixing metadata. The user has the
option of routing the
mixed
audio, main audio (
Main_only
), or
associated audio to the main output (
AD_only
).
Ad_2ch_mix
Same as
Ad_mix
, but for the 2ch monitoring output of the decoder. Here
you can set the audio description as your monitoring output.
Operating_mode
The content of the dual-substream inputs (including 7.1 and 5.1+AD) has
to be set manually with this setting.
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