AAV-HD-DMUX(-R)/ AAV-SD-DMUX(-R)
Rev. 1
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
extracted from the video signal. All the packed data is sent to the group router. The de-
embedded audio is sent to the stereo audio cross-point router.
The audio processing is performed on the stereo router outputs.
Four of the router outputs are connected to the four stereo delay lines. The outputs of the
delay lines are connected to four inputs of the stereo audio router.
The audio signal is delayed by a few samples during de-embedding, re-packeting the audio
and audio processing. Signals that pass through the stereo audio router will be delayed by a
small number of samples. The group router outputs from the de-embedders do not
introduce any additional delay as the audio does not require unpacking and re-packing.
The embedder core embeds either re-packeted audio from the stereo router or the existing
de-embedded audio as configured in the group router.
The embedded audio packets are inserted into the video signal together with the control
packets and any other packets that were present in the original video signal. The video is
serialized and output through the cable and laser drivers.
The audio signals are taken from the outputs of the audio router. Outputs 1&2 are sent to
the audio DACs (digital to analog converters) while output 3&4 are sent to the AES outputs
3&4. AES outputs 1&2 are extra AES outputs which may be fed with the audio data of either
outputs 1&2 or 3&4.
1.3
Data signal
The data signal is transported using the User bits in one of the embedded audio streams. De-
embedded data is output on the RS485 output and data received at the R422 input is
embedded into the output video. The configuration sets the audio source containing the
data signal to de-embed, the data format to be received on the backplane connector and
which output signal to embed data into.
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