Sierra Video UPC-166 - Manual (Page 19)

Introduction UPC-166 Functional Description
The examples in Figure 1-7 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.
Control > Detect
Emb Ch 3 – Ch 6 below
overwrites with new 5.1.
upmix content. (Overwrite)
Control > Detect
on Emb Ch 3 – Ch 6 above
Figure 1-7 Up Mix Auto Enable/Bypass with Example Sources
1-15 UPC-166-OM
(V4.0)
From Audio
Routing/Gain Emb Ch 1 – Ch 16 Threshold 5.1 Up Mix
With all detected signal levels on
threshold
- 20 dBFS
- 60 dBFS
Selected channels Emb Ch 1 – Ch 6
Below Threshold
are overwritten with the new 5.1
To Audio
Embed
From Audio
Routing/Gain
Emb Ch 1 – Ch 16 Threshold 5.1 Up Mix
With any
threshold, upmixer is bypassed.
- 20 dBFS
(Bypass)
- 60 dBFS X
Because the selected channels are
already carrying viable content,
upmixing is bypassed, allowing the
six original Emb Ch 1
– Ch 6 to pass
unaffected.
To Audio
Embed
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.
X
X
Emb Ch 1
L
Emb Ch 2
R
Emb Ch 3
(C)
Emb Ch 4
(LFE)
Emb Ch 5
(Ls)
Emb Ch 6
(Rs)
detected signal levels
Above Threshold
L – Emb Ch 1
R – Emb Ch 2
C – Emb Ch 3
LFE – Emb Ch 4
Ls – Emb Ch 5
Rs – Emb Ch 6
Emb Ch 1
L
Emb Ch 2
R
Emb Ch 3
(C)
Emb Ch 4
(LFE)
Emb Ch 5
(Ls)
Emb Ch 6
(Rs)
, upmixer is active and