Linear Acoustic AERO.qc User Manual page 25

Linear Acoustic AERO.qc User Guide
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UPMAX-II
UPMAX-II produces a very high quality, stable 5.1 channel result from a two channel ste-
reo or surround encoded input signal. Built on the solid performance of original UPMAX,
the new UPMAX-II uses both time and frequency domain techniques to produce more
spacious results under many conditions. The results are downmix compatible producing
excellent results in stereo and perfect reconstruction with standard broadcast-style down-
mixes delivered to most consumers.
Under many conditions, UPMAX and UPMAX-II sound similar. Stereo LoRo content will
produce open and enjoyable results, and stereo LtRt content will result in a wide, engaging
surroundfield. If content is produced while monitoring through UPMAX-II, stunning re-
sults can be obtained.
Uniquely, UPMAX-II does not rely on detection of anti-phase audio to produce the sur-
round channel signals. This is of critical importance today because of the widespread use
of low bitrate audio coding for delivery of some programming. This can sometimes cause
coding artifacts to be unmasked and reproduced by the surround channels. UPMAX-II
avoids this by its very design and unmasked artifacts are minimized or avoided completely.
AutoMAX-II
AutoMAX is a method for automatically controlling the upmixing function of the
AERO.qc 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
Surround channels.
cent/Discovery UK, this mode is useful for content that has been produced
with only dialogue in the center channel (allows for alternate languages). De-
fault is Off.
Surround Depth- Controls how far the surround channels are panned to the
back speakers. 100% sends all surround channel upmix audio to Ls and Rs,
while 0% returns that audio to the front channels. Default is 100%.
LFE Level - Controls how much of a 80Hz low pass filtered sum of the Left,
Center, and Right outputs of the upmixer is fed to the LFE channel Main Out-
put; Default is -10dB.
Algorithm - Selects between industry standard Linear Acoustic UPMAX and
our newest version UPMAX-II, both of which produce very consistent and
downmix compatible results.
TM
TM
Automatic Upmixing
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Detailed Operation