Nevion FRS-HD-XMUX4 - Manual (Page 22)

FRS-HD-XMUX4 Rev. C
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eight stereo channels for re-embedding, four AES outputs, and a separate data output
for data recovered from one of the stereo pairs.
Each AES port is configurable as either an input or an output. Hence not all positions in
the matrix are legal.
For example, an AES port configured as an output can’t really
function as an input for embedding, even though the selection can be made in the
matrix.
Figure 15: Multicon GYDA configuration view of the audio cross point matrix
All embedded outputs have a common fallback option that can be set in Multicon
GYDA. The priorities can be selected between matrix (representing the selection
already made in the cross point matrix), sine, mute or delete/output off. Mute means
that legal audio is produces, but it contains just silence. Delete (for embedded
channels) means that the audio content is deleted, and the audio control package is set
to channel delete for its respective channels. Output off (used for AES outputs) simply
means that the output driver is turned off.
Figure 16: Multicon GYDA view of the audio fallback options
5.14 AES I/O
The direction of the four AES ports can be selected by the user. This means the user
has any combinations of inputs and outputs available: 4 inputs and 0 outputs, 3 inputs
and 1 output, 2 inputs and 2 outputs, 1 input and 3 outputs or no inputs and 4 outputs.
5.14.1 Audio inputs
When an AES I/O port is set to be input, the sample frequency of the input is monitored
to see if the signal is synchronous with the system clock. If not, the audio input is
passed through a sample-rate converter. After the input block the audio can be delay
with individual delay for each AES port, before it is routed to the audio matrix. The
audio delay for AES inputs are set relative to the AES input port.
If the AES input port is synchronous with the SDI-input, the user can select the AES
input delay to track to the video delay. The card will calculate the relative delay for the