Processing Structure; General Signal Flow Of The Aero.one Processing Core - Linear Acoustic AERO.one V3 User Manual

Linear Acoustic AERO.one V3 User Guide
• ITU LOUDness LMT - Utilizes a specially tuned Input AGC plus Multiband Limit-
ers and the Final Limiter to slowly adjust the average program loudness to a given value
and the multiband and final limiters will act until the AGC catches up. This preset is
appropriate for ingest or live applications but because the Multiband AGC is bypassed
it has less ability to manage spectral balance which is important for transmission.
• PROTECTION LIMIT - Bypasses all processing except for the final output limiter
which is set only to prevent overload.
5.1.1

Processing Structure

Before choosing to jump into shark infested waters, we STRONGLY recommend starting
with a factory preset and modifying from there. Preset creation starting from scratch is an
incredibly time consuming process requiring large amounts of time and huge amounts of
content spanning all genres including music of every type, films of every type, television
dramas and sitcoms of every type, and talking-head programs of every type. We have al-
ready done much of the heavy lifting, and provide presets based on our own listening and
feedback from customers over the past few years. Certain parameters such as crossover
frequencies and channel coupling are not adjustable and are hard-coded to the most ap-
propriate values. That being said, access to all adjustable parameters is provided. There are
no factory adjustments hidden from users. Be careful with this power as most all settings
interact with each other, sometimes in ways that might not be immediately audible.
Below is a drawing showing the general signal flow of the processing core to indicate what
part of the chain is being adjusted by each parameter. Note that this signal flow is also cap-
tured in the "Adjust Processing" menu, with the top of the list being the input, and the
bottom of the list being the output.
PCM Input
(1-6 chan)
Metadata
Figure 5-1 General signal flow of the AERO.one processing core
Crossover
Metadata
Crossover
Process
ITU BS.1770
Compliant
Crossover
AGC
Parametric
Crossover
Eq
(3 bands)
Presets, Processing & Metadata
B1 Limit
B1 AGC
(look ahead)
B2 Limit
B2 AGC
(look ahead)
B3 Limit
B3 AGC
(look ahead)
B4 Limit
B4 AGC
(look ahead)
B5 Limit
B5 AGC
(look ahead)
36
Low B
Level
Mid B
Level
Output Limiter
LMF
+
(look ahead) +
Level
Loudness Set
HMF
upMAX™
Level
Upmixing
HF
Level
PCM
Output