Cobalt Digital COMPASS 9081 HD_SD Frame Sync - Manual (Page 15)

9081-OM (V4.6) 9081 PRODUCT MANUAL 1-11
Introduction
9081 Functional Description
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 1-4 Up Mix Auto Enable/Bypass with Example Sources
Tone Generator Function
The 9305 contains four built-in tone generators (Tone Generator 1 thru Tone
Generator 4). Each of the four tone generators can be set to a different
frequency, and are available as audio sources for each embedded channel
audio output. 18 discrete sine wave frequencies are available, ranging from 50
Hz to 16 kHz (default frequency is 1.0 kHz).
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