Gpi Preset (Gpi 1-4); Upmixing - Linear Acoustic AERO.one V3 User Manual

Linear Acoustic AERO.one V3 User Guide
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4.5.4

GPI Preset (GPI 1-4)

Defines which of the stored presets a GPI will recall. Any of the sixteen stored presets are
available for selection.
4.5.5

Upmixing

Upmixing is the process whereby two channel audio can be transformed into 5.1 channels
of audio resulting in a pleasing and engaging manner. Dialogue remains centered, and mu-
sic and effects are present in the front and rear channel in proportion to their original phase
and magnitude. Original production values are maintained and the chances of downstream
re-processing (by consumer gear) are virtually eliminated.
The industry standard Linear Acoustic UPMAX
AERO.one. This allows for realistic 5.1 channel audio to be created from normal stereo or
LtRt inputs. Two channel mono can also be accommodated in an audibly pleasing manner.
Critically, the UPMAX algorithm is also fully downmix compatible. Many viewers are pre-
sented with Dolby
or receiver and they happily listen in stereo, none the wiser that more information is actu-
ally present. Upmixing systems that use phase shifting techniques can produce unaccept-
able results in these systems obscuring dialog and amplifying background artifacts.
AutoMAX-II
AutoMAX is a method for automatically controlling the upmixing function of the
AERO.air in situations where there is no GPI or metadata control signal available. This is
accomplished by detecting if the RMS signal level in the Center or Surround channels
crosses an adjustable threshold. If no signal form these channels crosses the threshold, the
upmixer is set to "Auto" mode where the Left Front and Right Front channels are up-
mixed and the resulting upmixed signal is combined with the discrete Center, LFE, and
Encod In On/Off: Reverse polarity of above.
DMX -> 7/8 Off/On: Sends downmix of main program audio to 7/8 output.
DMX -> 7/8 On/Off: Reverse polarity of above.
Local Off/Replace: Replaces main program audio with audio from Second-
ary program on 7/8 input. This audio has its own processing core (Secondary
Preset) and its own upmixer, both of which can be set the same or differently
than the Main program. There is no auto mode as the Local input can only be
two channels.
Local Replace/Off: Reverse polarity of above. Note that selecting this will
engage Local audio until a contact closure is applied to stop it.
®
Digital (AC-3) encoded audio that is downmixed in their set top box
TM
Automatic Upmixing
®
algorithm is incorporated in the
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Detailed Operation