Cobalt Digital COMPASS 9381 HD_SD-SDI Timecode Inserter - Manual (Page 15)

9381-OM (V4.3) 9381 PRODUCT MANUAL 1-11
Introduction
9381 Functional Description
Figure 1-5 Up Mix Auto Enable/Bypass with Example Sources
Tone Generator Function
The 9381 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 the embedded audio outputs.
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