Cobalt Digital Inc 9902-2UDX-DI, Product Manual, Page: 16 / 108

1
9902-2UDX-DI Functional Description
1-12
9902-2UDX-DI PRODUCT MANUAL 9902-2UDXDI-OM (V1.0)
Audio Down Mix Function
(See Figure 1-3.) The Audio Down Mixer function provides for the selection
of any five embedded channels 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 to any embedded
audio pair as desired (or de-embedded to an AES or analog audio output).
Figure 1-3 Audio Down Mix Functional Block Diagram with Example Sources
Flex Buses
For both input and output nodes before and after the card internal buses, flex
buses provide flexible-structure mixer in which any of 16 summing nodes
(
Flex Mix Bus A
thru
Flex Mix Bus P
) can receive any card audio input, thereby
allowing several customizable mixing schemes. Similarly, any of the 16 card
internal bus signals can be applied to an output flex bus mixer. The output flex
bus allows cross-sourcing from both
Path 1
and
Path 2
embedded internal
Audio Bus sources to the Path 1 and Path 2 discrete output audio crosspoints.
Control and Data Input/Output Interfaces
GPI Interface
Two independent ground-closure sensing GPI inputs (
GPI 1
and
GPI 2
; each
sharing common ground connection as chassis potential) are available.
Associated with each GPI user control is a selection of one of 32 user-defined
card presets in which GPI activation invokes a card control preset. Because
the GPI closure invokes a user-defined preset, the resulting setup is highly
flexible and totally user-defined. Invoking a user preset to effect a change
involves card setup communication limited only to the items being changed;
the card remains on-line during the setup, and the called preset is rapidly
applied.
GPI triggering can be user selected to consider the activity on discrete GPI
ports, or combinations of logic states considering both GPI inputs, as well as
be set for level or edge triggering. This flexibility allows multistage,
progressive actions to be invoked if desired. Indication is provided showing
whenever a GPI input has been invoked.
DM-L
L
R
C
Ls
Rs
DM-R
Emb Ch 1
Emb Ch 2
Emb Ch 3
Emb Ch 5
Emb Ch 6
Embed Ch 1 - Ch 16