
9902-2UDXDI-OM (V1.0)
9902-2UDX-DI PRODUCT MANUAL
1-11
Introduction
9902-2UDX-DI Functional Description
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 de-embed can be allocated individually
to any or either path’s embed or de-embed nodes.
The audio processor operates as an internal audio router. This function
chooses from 16 channels of embedded audio from the SDI video input from
either path (default 1-to-1 routing to SDI output)
The audio processing subsection is built around a card internal 16-channel
audio bus for each path. This 16-channel bus receives inputs from an input
routing crosspoint that routes de-embedded 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 audio outputs.
An Input Audio Status display shows the presence and peak level of each
input audio channel received by the card. Payload is identified (PCM or data
such as Dolby
®
Digital or E). 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.
(Option
+CQS)
. Clean and Quiet Switching allows SDI input
selection to be changed from one source to another while ducking audio
during controlled input video switching transitions to provide silence between
input switches. The cross-fade is queued for the next available RP168 switch
line following the switch command.
Note:
• Clean audio switching is assured only for intentional, controlled switches via
user control. Clean audio switching cannot be assured for failover switches.
• Clean switching requires that both SDI signals (switch from and switch to)
be stable and present.
• Clean audio switching function is designed for PCM audio. This function
does not assure clean decoded audio when switching from/to Dolby or other
non-PCM audio.
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