Cobalt Digital FUSION 3G 9931-EMDE 3G_HD_SD-SDI Embedder_De-Embedder - Manual (Page 20)

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9931-EMDE Functional Description
1-16 9931-EMDE PRODUCT MANUAL 9931-EMDE-OM (V1.15)
Flex Mixer. The flex mixer is a flexible-structure mixer in which any of 16
summing nodes ( Flex Mix Bus A thru Flex Mix Bus P ) can be applied to any of
the 16 inputs, thereby allowing several customizable mixing schemes. Any
individual input row can be assigned to any of the Flex Mix buses.
Using this scheme, full cross-point mixing of PCM signals can be achieved
within the limit of available Flex Mix buses, and eventually applied to any of
the internal bus channels. Figure 1-7 shows an example of two independent
3-to-1 mono mixers availed by setting inputs (rows) 1 thru 3 to use virtual
flex mix bus
Flex Mix Bus A , and by setting inputs 4 thru 6 to use virtual flex
mix bus Flex Mix Bus B . The Flex Mix A and Flex Mix B virtual outputs can then
be routed over any of the internal bus channels. In this example, because rows
1 thru 3 are all applied in common to mixer node
Flex Mix Bus A , the Flex Mix
Bus A output is the mono-mixed sum of these inputs. The mono mix on the
Flex Mix Bus B node similarly produces a mono mix of input rows 4 thru 6.
Figure 1-7 Flex Mixer with Dual Mono Mixer Example
Internal Bus
(See Figure 1-5.) The internal bus receives its audio inputs from the input
routing function and accommodates a maximum of 16 concurrent channels.
This conduit serves as a centralized point for managing audio delay offset
from video and master gain controls for outputs from the input routing
function.
A bulk (master) video/audio delay function allows adding or reducing audio
delay from the video delay. The 9931-EMDE re-establishes video/audio sync
following framesync changes by applying an offset in small, progressive
amounts to provide a seamless, glitch-free retiming.
In addition to the master sync/delay controls, each bus channel has its own
independent delay and gain control.
Flex Mix Bus A Emb Ch 1
Flex Mix A
Flex Mix Bus A
Flex Mix Bus A
Row 1
Row 2
Row 3
Emb Ch 2
Emb Ch 3
Flex Mix Bus B Emb Ch 7
Flex Mix B
Flex Mix Bus B
Flex Mix Bus B
Row 4
Row 5
Row 6
Emb Ch 8
Emb Ch 9
To Internal Bus
In this example, rows 1 thru 3 all set to
feed to Flex Mix Bus A node results in
a mono mix on Flex Mix A.
A second, independent mono mixer is
facilitated similarly, with rows 4 thru 6
all feeding to Flex Mix Bus B node
resulting in mono mix output
Flex Mix B.