Cobalt Digital COMPASS 9322 HD_SD De-Embedder - Manual (Page 13)

9323G-OM (V4.6) 9323 GROUP PRODUCT MANUAL 1-9
Introduction
932X Functional Description
Audio Processor Description
(See Figure 1-2.) The audio processor operates as an internal audio router.
The router function chooses from the following inputs:
• 16 channels of embedded audio from the SDI video
• 16 channels (8 pairs) of discrete AES input (9321, 9323 only)
• 8 channels of balanced analog audio input (9321, 9323 only)
• Four independent internal tone generators (described below)
• Digital silence (mute) setting
• Internal down mix and mono mixer outputs (described below)
• (+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 (9322, 9323
only)
The router acts as a full audio cross point. Each of the output channels can
receive signal from any one of the input channel sources, four internal tone
generators, or the Down Mix Left and/or the Down Mix-Right mixer outputs.
Unused output channels can be mapped to a “Silence” source. Each output
also provides gain adjustment and selectable polarity inversion.
(+DEC only) In addition to the audio sources described above, the up to 10
decoded Dolby
® channels are available as input sources.
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 card.) 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 1-4, the 9322 and 9323 are equipped with eight discrete
AES input pair ports and eight discrete AES output pair ports. On Rear I/O
Modules having 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 dedi-
cated outputs and as respective outputs fed through S11 – S14 on the card.