Nevion AAV-HD-DMUX - Manual (Page 5)

AAV-HD-DMUX(-R)/ AAV-SD-DMUX(-R) Rev. 7
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The AAV-HD-DMUX audio core is an AES3 stereo audio router. The received embedded
audios are the sources in the router. The embedded output groups and audio outputs are the
destinations. This feature may also be used to perform stereo channel swapping.
Four stereo delay lines are also available in the router with a total combined delay of 1.25s.
Audio processing is possible within each stereo output. The channels may be changed
allowing L/R swapping, mono assignment, summing, MS conversion and phase reversal of
one of the signals.
All embedding and de-embedding is performed with synchronous 48 kHz audio.
The unit may be ordered with optional optical receivers. The optical receiver may be either
the HD single mode PIN or the HD multi mode PIN. Both units will receive both HD and SD
data rates. The module has signal generators for audio and video for test and line up
applications. The internal video generator may be used as a fall-back source that is used if
the both the electrical and the optical input signals fail. This allows uninterrupted
transmission of embedded audio. The user may also configure the module to mute the
outputs if the input signal disappears.
1.1 Audio signal flow
Figure 2: Processing core overview
1.2 Signal flow
Video may be presented on the optical or electrical inputs. The module will switch to the
other input if the module can not lock to a signal. The video is re-clocked and transformed to
parallel video. The parallel video goes into a line buffer which is used to de-glitch the video
when switched on the correct line. No errors are flagged or produced when the video is
switched on the appropriate switching line. All ancillary data, including embedded audio is