Cobalt Digital COMPASS 9033 Input Processing Analog to Digital Video - Manual (Page 15)

9033-OM (V4.0) 9033 PRODUCT MANUAL 1-11
Introduction
9033 Functional Description
The examples in Figure 1-5 show the automatic enable/disable up-mixing
function applied to example selected channels
Emb Ch 1 thru Emb Ch 6 . As
shown and described, the processing is contingent upon the signal levels of
the channels selected to carry the new 5.1 upmix relative to the selected
threshold (in this example, -60 dBFS). Note also that this function is applied
after the Audio Routing/Gain Control function. Because all audio inputs pass
through the Audio Routing/Gain Control function before the up mixer, the up
mixer can use embedded, AES discrete, and/or analog audio sources.
Figure 1-5 Up Mix Auto Enable/Bypass with Example Sources
AES Ch 1 – Ch 16
>
From Audio
Routing/Gain
Control
AES Ch 1
AES Ch 2
AES Ch 3
AES Ch 4
AES Ch 5
AES Ch 6
L
R
(C)
(LFE)
(Ls)
(Rs)
L – AES Ch 1
R – AES Ch 2
C – AES Ch 3
LFE – AES Ch 4
Ls – AES Ch 5
Rs – AES Ch 6
To Audio
Routing
With all detected signal levels on
AES Ch 3 – Ch 6 below
threshold, upmixer is active and
overwrites with new 5.1.
Threshold
Detect
5.1 Up Mix
Selected channels AES Ch 1 – Ch 6
are overwritten with the new 5.1
upmix content.
AES Ch 1 – Ch 16
>
From Audio
Routing/Gain
Control
AES Ch 1
AES Ch 2
AES Ch 3
AES Ch 4
AES Ch 5
AES Ch 6
L
R
(C)
(LFE)
(Ls)
(Rs)
To Audio
Routing
Threshold
Detect
5.1 Up Mix
Because the selected channels are
already carrying viable content,
upmixing is bypassed, allowing the
six original AES Ch 1 – Ch 6 to pass
unaffected.
With any detected signal levels
on Emb Ch 3 – Ch 6 above
threshold, upmixer is bypassed.
X
X
X
Note: In either case shown here, the unselected
channels (in this example, Emb Ch 7 thru Ch
16) are not involved in this process and always
pass unaffected.
- 20 dBFS
- 60 dBFS
Above Threshold
(Bypass)
C
LF
E Ls Rs
- 20 dBFS
- 60 dBFS
Below Threshold
(Overwrite)
C
LF
E Ls Rs