Nevion ARC-SD-XMUX4 - Manual (Page 16)

ARC-SD-XMUX4 Rev. B
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To enable the board to act as a standalone and user configurable video generator, the video
generator must either be set as the first priority input when Mode is auto, or selected
manually by setting Mode to Video generator. This will override any video input but the
generator signal will still be locked to the sync or SDI inputs, if present. For true standalone
generator operation, the inputs must be removed. Available video standards are 486/25i and
576/25i.
3.8 Label generator
The label generator consist of 2 lines of 16 characters each that are placed at the lower left
corner of the active area.
Its main function enables the user to automatically add a label to the internal generator at
loss of input signal. It is done by selecting the auto tick-box on the Label generator block in
the Multicon GYDA configuration.
It is also possible to insert the label to the incoming SDI by ticking on the Enable tick-box.
Note that to see the label on an output the video output selection must be set to
“Processed” for that particular output.
3.9 Video processing block
The video processing block consists of a gain and offset adjustment, and a video payload
legalizer.
3.9.1 Gain and offset
The gain and offset adjustment is done separately on the Y, Cb and Cr samples.
Range Multicon GYDA
Luma gain 0
– 3.9999
Chroma gain 0
– 3.9999
Luma offset (gain =1) -511.75 – 511.75
Chroma offset (gain = 1) -255.75 – 255.75
3.9.2 Video payload legalizer
The legalizer hard clips the upper and lower limit of the video payload. With the legalizer
enabled the limits are:
Upper limit Luma: 3ACh
Chroma: 3C0h
Lower limit Luma: 040h
Chroma: 040h
With the legalizer disabled, the video processing block hard clips both luma and chroma to
3FBh and 004h.
3.10 EDH processing block
If enabled, the EDH processing block extracts the EDH packet from the video, updates the
EDH flags according to SMPTE RP165 and inserts the EDH packet into the ancillary data of
the video.
If disabled, The EDH processing block only reads, processes and reports the incoming EDH
packet status and deletes the packet from the video stream.
3.11 Video output selection
The board has four outputs. They are organized in two pairs of inverting/non-inverting
outputs. Each pair of outputs can be routed directly from the re-clocker or routed through the
processing unit.