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

ARC-SD-DMUX Rev. B
nevion.com | 16
The flat field option allows the user to specify any combination of luma and chroma values.
In normal operation (as a fallback generator), the video generator will take its video
standard setting from the last video input seen by the board.
To enable the board to act as a standalone and user configurable video generator, the
video generator must be either 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 should 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 video area.
The main function is to add a label to the internal generator on loss of input signal. The
label may also be configured to be permanently present.
Note that to see the label on an output the video output selection must be set to
“processed” for this specific output.
3.9 Video processing block
The video processing block consists of gain and offset adjustments and a video legalizer.
3.9.1 Gain and offset
The gain and offset adjustment is set separately on the Y, Cb and Cr samples.
Range Multicon GYDA
Luma gain 0 – 3.999
Chroma gain 0 – 3.999
Luma offset (gain =1) -511.75
– 511.75
Chroma offset (gain = 1) -255.75 – 255.75
3.9.2 Video payload legalizer
The legalizer limits the upper and lower values of the video payload to the following values.
Upper limit Luma: 3ACh
Chroma: 3C0h
Lower limit Luma: 040h
Chroma: 040h
Even with the legalizer disabled, the video processing block limits luma and chroma to
3FBh and 004h respectively.
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 and reports the incoming EDH packet
status and deletes the packet from the video stream.
3.11 Video output selection
The board has two non-inverting digital outputs and a group of three analog outputs. Each
of the outputs and the analog group can take their respective signals directly from the input
or from the output of the processing unit.