Cobalt Digital COMPASS 9067 Upconverter - Manual (Page 15)

9067-OM (V4.4) 9067 PRODUCT MANUAL 1-11
Introduction
9067 Functional Description
The router function provides up to 16 channels of embedded audio on the SDI
OUT outputs. The router acts as a full audio cross point. Each of the 16
embedded output channels can receive signal from any one of the 16
embedded 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. (Embedded
audio must be nominally 48 kHz input; 32, 44.1, 96, and 192 kHz inputs are
not compatible with the 9067.) Embedded output audio is always precisely
synchronized with the output video.
As set with the default settings, the routing between embedded audio channels
is basic 1-for-1 for the 16 embedded audio channels (with embedded Ch 1
being embedded to embedded Ch 1 at the SDI output, and so on). Other
sources and/or destinations for each channel are selected using the card edge
controls or a remote control system.
Audio Down Mix and Mono Mix Function
(See Figure 1-3.) The Audio Down Mixer function provides for the selection
of any five embedded audio sources 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 and
processed just like any of the other audio sources described earlier.
Figure 1-3 Audio Down Mix Functional Block Diagram with Example Sources
The Mono Mixer function (Figure 1-4) generates an additional mono-mixed
channel from two selected embedded input channels serving as left and right
inputs. The resulting mono mix channel is available as an audio source for
any of the 16 destination embedded output channels.
Figure 1-4 Audio Mono Mix Functional Block Diagram with Example Sources
DM-L
L
R
C
Ls
Rs
DM-R
Emb Ch 3
Emb Ch 5
Emb Ch 6
Emb Ch 9
Emb Ch 11
Embed Ch 1 - Ch 16
MONO
L
Σ
R
Emb Ch 12
Emb Ch 16
Embed Ch 1 - Ch 16