Nevion DWC-HD-DMUX - Manual (Page 14)

DWC-HD-DMUX Rev. F
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3.8 Video processing block
The video processing block consists of a gain and offset adjustment, and a video payload
legalizer.
3.8.1 Gain and offset
The gain and offset adjustment is done separately on the Y, Cb and Cr samples.
Range Gyda
Luma gain 0 – 32767 (0-4x, 1x = 8192)
Chroma gain 0 – 32767 (0-4x, 1x = 8192)
Luma offset (gain =1) -4095
– 4095
(-511.75
– 511.75 in sample values)
Chroma offset (gain = 1) -2047 – 2047
(-255.75 – 255.75 in sample values)
3.8.2 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.
3.9 EDH processing block
If enabled, the EDH processing block extracts the EDH package from the video, updates
the EDH flags according to SMPTE RP165 and inserts the EDH package into the ancillary
data of the video.
If disabled, The EDH processing block only reads, process and report the EDH package
without changing it in video stream.
3.10 Video output selection
The board has four digital outputs and group of three analog outputs. The four digital
outputs are organized as two pairs, each consisting of an inverting and a non-inverting
output. Each pair and the analog group can take their signal directly from the re-clocker or
from the output of the processing unit. In Gyda the direct paths are labeled Through and the
processing paths are labeled Processed.