Audio processor description -9, Introduction – Cobalt Digital COMPASS 9034 Input Processing Analog to Digital Video User Manual
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9034-OM (V4.1)
9034 PRODUCT MANUAL
1-9
Introduction
9034 Functional Description
Audio Processor Description
The audio processor operates as an internal audio router. The router function
chooses from the following inputs:
•
16 channels (8 pairs) of discrete AES input
•
8 channels of balanced analog audio input
•
Four independent internal tone generators (described below)
•
Digital silence (mute) setting
•
Internal Down Mix and Mono Mixer outputs (described below)
•
(9034-DEC only) Decoded Dolby
®
channels
The router function provides the following audio outputs:
•
16 channels of embedded audio on the SDI output
•
16 channels of discrete AES output on eight AES pairs
The router acts as a full audio cross point. Each of the 32 output channels (16
embedded AES, 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 9034.) 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 9034 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 9034 card.