Nevion UDC-3G-XMUX4+ - Manual (Page 36)

UDC-3G-XMUX4+ Rev. C
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3.9 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 is to enable the user to automatically add a label to the internal generator at
loss of input signal. This is done by selecting the auto tick-
box on the “Label gen” block in the
Multicon GYDA configuration.
It is also possible to superimpose the labe
l on the incoming SDI by ticking the “On” box.
Note that to see the label on an output the video output selection must be set to
“processed” for this specific output.
Figure 22: Multicon GYDA view of label generator
3.10 Video processing block
The video processing block consists of a gain and offset adjustment, and a video payload
legalizer.
Figure 23: Multicon GYDA view of the video processing block
3.10.1 Gain and offset
The gain and offset adjustments are done separately for 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 in sample values
Chroma offset (gain = 1) 255.75 – 255.75 in sample values
3.10.2 Video payload legalizer
The legalizer hard clips the upper and lower limit of the video payload. With the legalizer
enabled these 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.
3.11 Color space conversion
HD and SD use different color spaces. The conversion from one color space to another will
be handled automatically by the card when converting from SD to HD (or vice versa), but the
user also has the option to turn the color space converter off.
Figure 24: Multicon GYDA view of the color space conversion block