Nevion ARC-SD-XMUX4 - Manual (Page 17)

ARC-SD-XMUX4 Rev. B
nevion.com | 17
3.12 Audio overview
Figure 4: Audio function blocks
3.13 Audio de-embedder
The Audio de-embedder extracts all audio embedded in the video stream. The de-embedder
is always enabled.
3.14 Audio delay
An audio delay can be specified relative to the video output. It is situated before the audio
cross point matrix and is common for all de-embedded channels. The audio delay is
specified in terms of 48 kHz audio samples, and can be set to positive or negative values.
NOTE: As the audio delay is relative to the video output it is possible to specify an audio
delay that will actually be a negative delay, i.e. ask that the sound is sent from the card
before it is received. This will obviously cause audio errors.
3.15 Audio cross point matrix
The audio cross point matrix is a 14x13 cross point with inputs and outputs as shown in
Figure 4. The 8 de-
embedded channels, a 1 kHz sine and “black sound” are selectable
inputs. “Black sound” is explained in chapter 3.1. The outputs of the cross points are 8 stereo
channels for re-embedding and one 4 AES output.
The 13 output channels from the cross point matrix have configurable fallbacks, used when
their corresponding matrix inputs are missing. A common fallback setting is used for all eight
re-embedder channels, whereas the 4 AES outputs have their own independent fallback
settings. The priorities can be selected between matrix (being the selected channel in the
cross point matrix) or the internally generated sine or black sound.