Cobalt Digital Inc 9305 Product Manual page 51

Operating Instructions
Table 3-2 9305 Function Submenu List — continued
• 5.1 Detection Threshold Control
• Center Width Control
• Surround Depth Control
9305-OM (V4.1)
9305 Function Submenu List and Descriptions
(continued)
Adjusts the threshold at which selected channels designated as C, LFE,
Ls, and Rs are considered to have viable content, or at which signal levels
can be considered insignificant when upmixer enable is set to Auto.
Setting affects automatic enable/bypass of 5.1 upmix function as follows:
• If detected signal level on all four of the selected channels designated
as Center, LFE, Left Surround, and Right Surround are below the level
threshold set using the 5.1 Detection Threshold control, upmixer allows
overwrite of all six selected channels with the new 5.1 signal
complement.
• If detected signal level on any of the four of the selected channels
designated as Center, LFE, Left Surround, and Right Surround is above
the level threshold set using the 5.1 Detection Threshold control,
upmixer is bypassed, thereby releasing the selected six channels and
allowing the original channels to pass unaffected.
(Range is -150 dB to 0 dB in 0.1dB steps;
0 dB equivalent to +24 dBu=> 0 dBFS; default = 0%)
Typically, the 5.1 Detection Threshold control should be set to provide
a usable threshold that maintains a threshold at which valid levels large
enough over the threshold disable auto upmix when present (
- 20 dBFS
- 60 dBFS
B
A
recommended for material closely adhering to the SMPTE -20 dBFS
Alignment level for normal material such as dialog.
Adjusts center channel content (in terms of percentage) applied to L and
R channels.
• Minimum setting keeps all L+R (mono) content confined to center (C)
channel, with any center channel content removed from L and R
channels.
• Higher settings progressively blend respective L and R mono content
back into L and R channels, with 100% setting resulting in center
channel level going to zero and L/R channels becoming normal L/R
channels containing some mono content.
(0% to 100% range in 0.1% steps; default = 0%)
Adjusts surround channel content (in terms of percentage) applied to Ls
and Rs channels.
• Maximum setting results in greatest surround channel levels.
• Lower settings progressively diminish surround channel levels, with 0%
setting resulting in no Ls or Rs level, with Ls and Rs content
progressively folded back into L and R, respectively.
(0% to 100% range in 0.1% steps; default = 100%)
9305 PRODUCT MANUAL
while nuisance levels
considerably below the
threshold (
B
Above Threshold
(Bypass)
rejected, allowing the
upmixer to stay locked in
the enabled mode and
Below Threshold
overwrite these signals
(Overwrite)
with the new signals.
Optimum setting is
dependent on program
material general overall
levels. A -60 dB setting is
, left),
A
, left) are
3-25