Cobalt Digital COMPASS 9305 Embedded Audio Delay Processor - Manual (Page 13)

9305-OM (V4.1) 9305 PRODUCT MANUAL 1-9
Introduction
9305 Functional Description
• If a signal level below a selected threshold on all four of the selected
channels designated as
C , LFE , Ls , and Rs is present, this indicates
that these channels are not carrying 5.1. In this case, the upmixer
overwrites all six selected channels with the new 5.1 content.
• If a signal level above a selected threshold on any of the four selected
channels designated as
C , LFE , Ls , and Rs , this indicates that the
channel(s) are already carrying viable 5.1 content. In this case,
upmixing is bypassed, allowing the original channels to pass
unaffected.
The examples in Figure 1-4 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 Delay and Audio Routing/Gain Control functions.
Figure 1-3 Up Mix Auto Enable/Bypass with Example Sources
Emb Ch 1 – Ch 16
> From Audio Routing/Gain Control
Emb Ch 1
Emb Ch 2
Emb Ch 3
Emb Ch 4
Emb Ch 5
Emb Ch 6
L
R
(C)
(LFE)
(Ls)
(Rs)
L – Emb Ch 1
R – Emb Ch 2
C – Emb Ch 3
LFE – Emb Ch 4
Ls – Emb Ch 5
Rs – Emb Ch 6
To Audio Embed
With all detected signal levels on
Emb Ch 3 – Ch 6 below
threshold, upmixer is active and
overwrites with new 5.1.
Threshold
Detect
5.1 Up Mix
Selected channels Emb Ch 1 – Ch 6
are overwritten with the new 5.1
upmix content.
Emb Ch 1 – Ch 16
> From Audio Routing/Gain Control
Emb Ch 1
Emb Ch 2
Emb Ch 3
Emb Ch 4
Emb Ch 5
Emb Ch 6
L
R
(C)
(LFE)
(Ls)
(Rs)
To Audio
Embed
Threshold
Detect
5.1 Up Mix
Because the selected channels are
already carrying viable content,
upmixing is bypassed, allowing the
six original Emb 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