Ross LDP-8242, User Manual, Page: 79 / 100

LDP-8242 User Manual (Iss. 03) Operating Instructions • 3–45
(continued)
• 5.1 Detection Threshold Control
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 three of the selected channels
designated as Center, 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 three of the selected channels
designated as Center, 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
Typicallythe 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 the auto upmix (A) while nuisance
levels considerably below the threshold (B) are rejected, allowing the
upmixer to stay locked in the enabled mode and overwrite these signals
with the new signals.
Optimum setting is dependent on program material general overall levels.
A -60dB setting is recommended for material closely adhering to the
SMPTE -20dBFS Alignment level for normal material such as dialog.
• Center Width Control
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%)
• Surround Depth Control
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%)
-20dBFS
-60dBFS
C Ls Rs
A
C Ls Rs
B
Above Threshold
(Bypass)
Below Threshold
(Overwrite)