Grass Valley Imagestore 750 v.3.0.1 - Manual (Page 152)

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Advanced Audio
Up-Mix
Fig. 6-22: Up-Mix module, AutoMax mode
 Note: When AutoMAX TM is enabled, the input channels 1 and 2 (L/R) are always up-mixed
onto outputs 1-6 (L/R/C/LFE/Ls/Rs). If input channels 3–6 are also present then these signals
are mixed onto the up-mixed C/LFE/Ls/Rs outputs. In summary, there is no dynamic signal
detection between 5.1 and stereo inputs.
The following additional parameters may be set on an up-mix module:
The Imagestore 750 Configurator’s ‘Audio Graph’ page shows a pair of down-mix outputs in
addition to the 6 up-mix outputs. These give an alternative mix for any stereo-only applications:
Fig. 6-23: Imagestore 750 Configurator - Audio graph Up-Mix representation
Up-Mix Processing Times
Up-mix processing takes one video frame to perform.
Up-Mix 5.1 Audio 5.1 Audio
or Stereo
Parameter Description
LFE enable Enable or disable low frequency effects.
LFE level Sets the level of the created bass enhancement signal (expressed as percent-
age)
Center width Controls how much of the center channel of the up-mixer is spread to the left
and right channels. 0%=full center, 100%=full L/R.
Surround depth Controls back-to-front panning of the surround output where 100% equals
full signal from left surround (Ls) and right surround (Rs) and 0% equals sur-
round fully mixed into the left/right/center (L/R/C) channels. 0%=full L/R,
100%=full Ls/Rs.
Up-mix to discrete time Time (ms) to cross-fade from up-mixed output to discrete (non-up-mixed)
source.
Discrete to up-mix time Time (ms) to cross-fade from discrete (non-up-mixed) source to up-mixed
output.
Threshold Sets the threshold for the AutoMAX-II algorithm to decide that the input
audio is not 5.1 (expressed in dB as a positive number).
Down-mix type Sets the down-mix type as Lt/Rt or Lo/Ro. (See Down-Mix Options on
page 115)
Table 6-5: Up-Mix parameters