Cobalt Digital COMPASS 9033 Input Processing Analog to Digital Video - Manual (Page 13)

9033-OM (V4.0) 9033 PRODUCT MANUAL 1-9
Introduction
9033 Functional Description
The router acts as a full audio cross point. Each of the 32 output channels (16
embedded, 16 discrete AES) can receive signal from any one of the 16 AES
or 8 analog input channels, four internal tone generators, or several mixer
outputs. Unused output channels can be mapped to a “Silence” source. Each
output also provides gain adjustment and selectable polarity inversion.
Output audio rates are always 48 kHz locked to output video, but discrete
AES inputs can pass through the sample rate converters to align these inputs
with the output timing. (AES must be nominally 48 kHz input; 32, 44.1, 96,
and 192 kHz inputs are not compatible with the 9033.) The sample rate
converters are disabled by default. Output AES is always precisely
synchronized with the output video. The balanced analog audio input is
sampled at 48 kHz with a +24 dBu clipping level (+24 dBu => 0 dBFS).
Note: As shown in Figure 1-1, the 9033 is equipped with eight discrete AES input
pair ports and eight discrete AES output pair ports. On Rear I/O Modules hav-
ing limited AES I/O capabilities, switches S11 thru S14 allow available rear
module BNC connectors to be allotted between AES inputs and outputs as
desired. Buffered copies of
AES OUT (1-4) are available as dedicated outputs
and as respective outputs fed through S11 – S14 on the 9033 card.
Audio Down Mixer and Mono Mixer Function
(See Figure 1-3.) The Audio Down Mixer function provides for the selection
of any AES discrete, analog audio (or Dolby decoder where equipped)
sources serving as Left (
L ), Right ( R ), Center ( C ), Left Surround ( Ls ), and
Right Surround ( Rs ) individual signals to be multiplexed into a 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 and processed just like any of the
other audio sources described earlier.
Figure 1-3 Audio Mixing Functional Block Diagram with Example Sources
The Mono Mixer function (Figure 1-4) generates an additional mono-mixed
channel from two selected AES, analog (or Dolby decoder where equipped)
input channels serving as left and right inputs. The resulting mono mix
channel
MONO can in turn be routed and processed just like any of the other
audio sources described earlier.
DM-L
Ls
L
C
R
Rs
DM-R
AES Ch 1
AES Ch 2
AES Ch 3
AES Ch 5
AES Ch 6
AES Ch 1 - Ch 16
AN-AUD Ch 1- Ch 8