Cobalt Digital Inc 9934-AUD-PRO Product Manual page 18

1
Figure 1-5 Audio Down Mix Functional Block Diagram with Example Sources
1-14
Audio Down Mix Function
(See Figure 1-5.) 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.
Audio DSP Function
The Audio DSP Function provides a DSP-based platform that supports
multiple audio DSP options. When optioned with various diverse audio
processing options, the DSP-based processing core (which supports numerous
simultaneous processing engines) uses license "credits" which allows flexible
tailoring of multiple proc function instances. Audio proc options include
®
Dolby Real-Time Loudness Leveling automatic loudness processing,
®
Dolby D/D+ encode/decode, and Linear Acoustic
upmixing.
(See Figure 1-6) The Audio DSP block is positioned between all card audio
inputs (input mixer positioning) as well as audio outputs (output mixer
positioning). Actual audio DSP proc functions are facilitated using licenses
for these options. When any audio option is licensed (activated), the
processing can be positioned at the input or output mixer as desired.
path positioning locates the DSP pipeline to receive basic
Input Mixer
•
external inputs coming into the card, and then allows DSP processed
output channels to be directed to the card internal Audio Bus
channels by selecting Audio DSP channels as sources for destination
Audio Bus channels via the Input Audio Routing/Controls
9934-AUD-PRO PRODUCT MANUAL
9934-AUD-PRO 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
®
UPMAX™ automatic
9934-AUDPRO-OM (V1.1)