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Linear Acoustic AERO.qc User Guide
•
Center Width: controls how much of center channel output of the upmixer is spread
back into the Left and Right channel Main Outputs of the unit; The Default is 33% to
prevent two channel mono material from being reproduced as stark center channel
only audio, and to prevent center channel build-up with music content.
•
LFE Level: Sets the level of the created bass enhancement signal sent to the LFE out-
put.
AutoMAX-II
Upmixing is performed on the Lf/Rf signals, and the output of the upmixer is summed
with signals present on the C/LFE and Ls/Rs inputs. This is useful primarily for situations
where no GPI contact closure and no metadata commands are available and two-channel
and 5.1 channel audio are present within the same three AES pairs and it is impossible to
explicitly signal when the audio is in either state.
While this process may slightly affect true 5.1 channel programming, it is not possible to
"trick" the system. Other methods that use level detection for determining whether pro-
gramming is two channel or 5.1 can always be tricked by certain programming. It is impos-
sible to reliably determine the true number of channels simply by the detecting the absence
of Center, LFE, and/or the surround channels.
However, combining the above process of "partial upmixing" with level detection on the
remaining discrete channels and careful timing of crossfades create an optimal process that
cannot be fooled and will not affect discrete 5.1 channel audio. The AutoMAX-II mode is
available on the LfRf upmixer and its operation is described in Chapter 4.
TM
Automatic Upmixing
Presets & Processing Adjustment
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