Cobalt Digital Inc 3G Fusion 9931-EMDE Product Manual page 20

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1-16
Flex Mixer. The flex mixer is a flexible-structure mixer in which any of 16
summing nodes (
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
mix bus
Flex Mix Bus B
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
output is the mono-mixed sum of these inputs. The mono mix on the
Bus A
Flex Mix Bus B
Row 1 Flex Mix Bus A
Flex Mix Bus A
Flex Mix Bus A
Row 2
Row 3
Flex Mix Bus B
Row 4
Flex Mix Bus B
Flex Mix Bus B
Row 5
Row 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.
9931-EMDE PRODUCT MANUAL
9931-EMDE Functional Description
thru
Flex Mix Bus A Flex Mix Bus P
, and by setting inputs 4 thru 6 to use virtual flex
. The
Flex Mix A
node similarly produces a mono mix of input rows 4 thru 6.
Flex Mix A
Flex Mix B
) can be applied to any of
and virtual outputs can then
Flex Mix B
Flex Mix Bus A
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.
9931-EMDE-OM (V1.17)
, the
Flex Mix