1
9902-UDX-FS Functional Description
1-12
9902-UDX-FS PRODUCT MANUAL
9902-UDX-FS-OM (V1.1)
Audio Processor Description
Note:
Path 1 and Path 2 have individual independent digital audio embed and
de-embed banks for each of the processing path’s 16-channels of embedded
audio. The card’s 16 channels of AES embed/de-embed can be allocated
individually to any or either path’s embed or de-embed nodes. Similarly,
four-channel analog audio can be individually allocated across any or either
path’s embed or de-embed nodes.
The audio processor operates as an internal audio router. This function
chooses from the following inputs:
•
16 channels of embedded audio from the SDI video input (default
1-to-1 routing to SDI output)
•
Up to 16 channels (8 pairs) of discrete AES input
1
•
Up to 4 channels of balanced analog audio input
(See Figure 1-3.) The audio processing subsection is built around the card’s
two internal 16-channel audio buses (Path 1 and Path 2). Each 16-channel bus
receives inputs from an input routing crosspoint that routes de-embedded, and
discrete AES and analog audio inputs, over the 16-channel card bus.
Correspondingly, at the output end of the 16-channel bus is an output routing
crosspoint that in turn distributes the 16-channel bus signals to embedded, and
discrete AES and analog audio outputs. .
An Input Audio Status display shows the presence and peak level of each
input audio channel received by the card. In addition to SDI embedded audio
channel sources, analog and coaxial AES inputs are available as input audio
choices. For AES audio inputs, payload is identified (PCM or data such as
Dolby
®
Digital or E). Each AES input pair has independent sample rate
converters to align each input pair with video timing to accommodate cases
where AES audio is not synchronous with input video (SRC automatically
bypassed for non-PCM payloads). As such, the audio subsection provides a
full crosspoint between all supported audio inputs and output types. The audio
output crosspoint for each path’s embedded output allows embedded channel
selection from the respective path’s own channels, or channels from the
alternate processing path.
Figure 1-3 Basic Audio Processing Block Diagram
1. Discrete audio I/O channel count is dependent on rear I/O module used.
De-Embed IN 1-16
(from Program
Video De-Embed)
AES
Rx/SRC
Input Routing
Internal
Bus
Routing/Gain/
Mute/Invert
Controls
Analog
Audio
ADC
Audio
Meters
AES IN
AN-AUD
IN
Audio
Delay
Offset
Control
Internal Bus Controls
Ref
Dolby E
Alignment
Control
Output Routing
Routing/Gain/
Mute/Invert
Controls
Audio
Meters
AES
Tx
Analog
Audio
DAC
AES OUT
AN-AUD
OUT
Embed 1-16
(to Program Video
Embed)
Downmix
