Sam Sirius 840 User Manual page 151

Sirius 800 Series User Manual
9.19.2.2 How Input Embedding Works
Each Video input port to be used for audio embedding can be assigned up to 16 audio
channels from the audio crosspoint module. The crosspoint audio channels are selected
using the Input Embedding Routing screen (Figure 105).
The following simplified diagram shows how one or more of the original embedded audio
channels of the video input are overwritten by the audio channels routed from the audio
crosspoint.
Incoming video, original embedded
audio channels
Audio channels from the
Audio Crosspoint
Use Audio Crosspoint channel?
The resulting Audio Package is a
combination of original incoming
embedded audio and audio routed
from the Crosspoint
Because channel positions 1 to 4 and 7 to 8 have been overwritten the original embedded audio signals on those
channel positions is lost and cannot be routed to any destinations in the router.
If there are unused channel positions this can be overcome by shuffling the required original embedded channel to an
unused position. Shuffling is controlled from the Video AHP Input Embedding Audio Processing screen (Figure 106).
Table 31 Simplified Input Embedding Audio Channel Operation
Important:
Iss 5 Rev 7
5919 Sirius 800 Video AHP Input Module with Delay and Sync
Ch1 Ch2 Ch3
Ch1 Ch2 Ch3
Yes Yes Yes
Ch1 Ch2 Ch3
• Input embedding works by replacing/overwriting the original source video
embedded audio channels with audio channels sourced from the audio crosspoint.
This means these original embedded audio channel positions are lost and cannot
be routed to any destinations in the router.
There is no indication of this on the interface and the audio channel will appear to
be available for routing.
• Do not input embed an audio channel from the audio crosspoint back on to itself as
this will break the audio for that channel. This is because the audio signal
overwrites itself resulting in a very short loop of fragmented audio which breaks
that channel. See the following example:
Example: Embedding audio channel 1 of video source 3 back on to audio channel
1 of video source 3 via the crosspoint results in a very short loop of fragmented
audio which breaks the audio for channel 1.
5919 Video AHP Input Module
Video Source 3 Audio Ch 1
Ch4 Ch5 Ch6 Ch7 C 8
+
Ch4 Ch5 Ch6 Ch7 C 8
Yes No No Yes Yes
=
Ch4 Ch5 Ch6 Ch7 C 8
Video Source 3, Audio Ch 1 re-embedded
from the Audio Crosspoint
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Input Rear Panels and Input
Ch9 Ch10 Ch11 Ch12 Ch13 Ch14 Ch15 Ch16
Ch9 Ch10 Ch11 Ch12 Ch13 Ch14 Ch15 Ch16
No No No No No
Ch9 Ch10 Ch11 Ch12 Ch13 Ch14 Ch15 Ch16
Audio Crosspoint Module
No No No
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