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Linear Acoustic AERO.one V3 User Guide
All three scenarios show how simply the AERO.one integrates into a television plant.
Additional features to support SAP and DVS or alternate channels of audio are present in
the AERO.air (5.1) version of the product. Please contact your salesperson or the factory
for more information.
3.4
Audio Metadata
Audio metadata, or data that describes the audio data, is used in the AC-3 system to rep-
resent important parameters such as the number of channels that have been encoded (au-
dio coding mode or acmod), the loudness of the program with respect to dialogue
(dialogue level or dialnorm), and dynamic range control (Line Mode and RF Mode DRC
presets). Applied to an AERO.one, audio metadata can be used to control functions such
as when to apply upmixing and eventually guide processing preset selection. Use of an
AERO.one with metadata can also protect stations from metadata failure.
3.5
Dolby Digital Encoder Setup (external metadata)
In environments where the television network is providing reliable metadata to affiliate sta-
tions and the stations are able to access it, the AERO.one can work in tandem with this
data to ensure audio of the highest reliability and consistency. When installing an
AERO.one, network audio metadata should be connected only to the AERO.one.
By analyzing the incoming metadata, features such as upmixing can be automatically in-
voked when appropriate. The AERO.one is also capable of detecting metadata failure and
responding appropriately. For example, if metadata were to fail during a 5.1 channel pro-
gram, upmixing should not be invoked, nor should an AC-3 encoder be switched to 2/0
stereo mode, and both of these situations are prevented.
As the dynamic range, and hence the average loudness of the programming is being con-
trolled by the AERO.one, metadata such as dialnorm and DRC presets should be set to
fixed values. Suggestions are to set dialnorm to -24 and select Film Standard for both the
Line Mode and RF Mode DRC presets. In this manner, the AERO.one will automatically
pre-adjust the audio to match these settings.
3.6
Dolby Digital Encoder Setup (local metadata)
To use the AERO.one with a Dolby Digital encoder in an environment without external
metadata, such as the type that might be delivered by a network, three critical values must
be set in the AC-3 encoder:
•
Audio Coding Mode: sets the number of channels to encode. Format is Front Chan-
nels/Rear Channels: 3/2 is for 5 channel, 2/0 is for stereo. LFE is enabled or disabled
elsewhere to create 3/2L for 5.1.
17
Applications
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