Cobalt Digital COMPASS 9381 HD_SD-SDI Timecode Inserter - Manual (Page 13)

9381-OM (V4.3) 9381 PRODUCT MANUAL 1-9
Introduction
9381 Functional Description
Audio Down Mix and Mono Mix Function
(See Figure 1-3.) The Audio Down Mixer function provides for the selection
of any five embedded audio sources serving as Left (
L ), Right ( R ), Center ( C ),
Left Surround ( Ls ), and Right Surround ( Rs ) individual signals to be
multiplexed into stereo pair Down Mix Left ( DM-L ) and Down Mix Right
( DM-R ). The resulting stereo pair DM-L and DM-R can in turn be routed and
processed just like any of the other audio sources described earlier.
Figure 1-3 Audio Down Mix Functional Block Diagram with Example Sources
The Mono Mixer function (Figure 1-4) generates an additional mono-mixed
channel from two selected embedded input channels serving as left and right
inputs. The resulting mono mix channel is available as an audio source for
any of the 16 destination embedded output channels.
Figure 1-4 Audio Mono Mix Functional Block Diagram with Example Sources
2.0-to-5.1 Upmix Function
Note: Upmix function is an optional licensable feature. This function and its controls
appear only when a license key is entered and activated. (This option (identi-
fied in Cobalt
® price lists as +UM) can be purchased upon initial order, or
field-activated using a key string which is sent to you when this option is pur-
chased.)
The 2.0-to-5.1 upmixer function receives a normal PCM stereo pair from the
Audio Routing/Gain Control function and upmixes the pair to provide 5.1
channels (Left (
L ), Right ( R ), Center ( C ), Low Frequency Effects ( LFE ), Left
Surround ( Ls ), and Right Surround ( Rs )). Whenever the upmixer is active, it
overwrites the six selected channels with the new 5.1 upmix signals
(including replacing the original source stereo
L and R inputs with new L and
R signals).
DM-L
L
R
C
Ls
Rs
DM-R
Emb Ch 3
Emb Ch 5
Emb Ch 6
Emb Ch 9
Emb Ch 11
Embed Ch 1 - Ch 16
MONO
L
Σ
R
Emb Ch 12
Emb Ch 16
Embed Ch 1 - Ch 16