Linear Acoustic LA-5180 Metadata Frame Sync/Generator Operation Manual
Metadata
43
•
Speech
Max Boost: 15 dB (below -50 dB)
Boost Range: -50 dB to -31 dB (5:1 ratio)
Null Band Width: 5 dB (-31 dB to -26 dB)
Early Cut Range: -26 dB to -16 dB (2:1 ratio)
Cut Range: -16 dB to +4 dB (20:1 ratio)
•
None
No DRC profile selected. The dialogue level parameter (dialnorm) is still applied
NOTE:
Protection DRC is still active in “None” mode
These choices are available to the content producer for both Line Mode and RF Mode.
The content producer chooses which of these profiles to assign to each mode; when the
consumer or decoder selects a DRC mode (i.e. apply DRC fully, not at all, or anywhere in-
between), the profile chosen by the producer is applied.
Note that the DRC profile is a choice available only when setting up metadata, and is used
by the emission encoder to guide its generation of the actual Line Mode and RF Mode gain
control values (dynrng and compr, respectively). Once the profile is set and is used by the
encoder, the only information available in the metadata stream are these gain control val-
ues. Importantly, these gain control values can be extracted and displayed in the form of a
gain reduction/expansion meter a very useful tool available in the Linear Acoustic LAMB-
DA and Dolby DM100, DP564, and LM100 products.
In addition to the DRC profile, metadata can limit signal peaks to prevent clipping during
downmixing. This metadata, known as overload protection, is inserted by the encoder only
if necessary. For example, consider a 5.1-channel program with signals at digital full scale
on all channels being played through a stereo, downmixed line-level output. Without some
form of attenuation or limiting the output signal would obviously clip. Correct setting of
the dialogue level and DRC profiles normally prevents clipping and unnecessary applica-
tion of overload protection.
Summary of Contents for MetaMAXLA-5180
Page 1: ...Model LA 5180 MetaMAX Series Audio Metadata Frame Synchronizer and Generator Operation Manual...
Page 2: ......
Page 8: ...Linear Acoustic LA 5180 Metadata Frame Sync Generator Operation Manual viii...
Page 12: ...Linear Acoustic LA 5180 Metadata Frame Sync Generator Operation Manual Introduction 8...
Page 16: ...Linear Acoustic LA 5180 Metadata Frame Sync Generator Operation Manual Connections 12...
Page 20: ...Linear Acoustic LA 5180 Metadata Frame Sync Generator Operation Manual Applications 16...
Page 26: ...Linear Acoustic LA 5180 Metadata Frame Sync Generator Operation Manual Menus 22...
Page 54: ...Linear Acoustic LA 5180 Metadata Frame Sync Generator Operation Manual Metadata 50...
