Control And Data Input/Output Interfaces - Cobalt Digital Inc 9903-UDX-ADDA Product Manual

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Figure 1-4 Audio Down Mix Functional Block Diagram with Example Sources

Control and Data Input/Output Interfaces

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Audio Down Mix Function
(See Figure 1-4.) The Audio Down Mixer function provides for the selection
of any five embedded channels serving as Left (
Surround ( ), and Right Surround (
Ls
into stereo pair Down Mix Left (
resulting stereo pair
DM-L
audio pair as desired (or de-embedded to an AES or analog audio output).
Embed Ch 1 - Ch 16
Emb Ch 1 L
R
Emb Ch 2
C
Emb Ch 3
Emb Ch 5 Ls
Rs
Emb Ch 6
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
( thru
Flex Mix Bus A Flex Mix Bus P
allowing several customizable mixing schemes. Similarly, any of the 16 card
internal bus signals can be applied to an output flex bus mixer.
GPI Interface
Two independent ground-closure sensing GPI inputs (
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.
9903-UDX-ADDA PRODUCT MANUAL
9903-UDX-ADDA Functional Description
), Right (
L
) individual signals to be multiplexed
Rs
) and Down Mix Right (
DM-L
and can in turn be routed to any embedded
DM-R
DM-L
DM-R
) can receive any card audio input, thereby
), Center ( ), Left
R C
). The
DM-R
and ; each
GPI 1 GPI 2
9903UDXADDA-OM (V1.5)