Nevion FRS-HD-XMUX4 - Manual (Page 19)

FRS-HD-XMUX4 Rev. C
nevion.com | 19
The “On” tick-box will show the label at all times, while the “Off” will turn the label
generator off at all times. If
“Auto” is ticked, the label will be shown as an overlay on the
internal video generator only. Typically, the internal video generator will be used as a
fallback for the physical video inputs, and hence this feature provides a means to
identify the card with the missing input in a long chain of cards.
Note that in order to see the label on an output, the video output selection
must be set to “processed” for that specific output.
Figure 9: Multicon GYDA view of label generator
5.7 Video processing block
The video processing block consists of a gain and offset adjustment, and a video
payload legalizer.
Figure 10: Multicon GYDA view of the video processing block
5.7.1 Gain and offset
The gain and offset adjustment is done separately on the Y, Cb and Cr samples.
Range Multicon GYDA
Luma gain 0
– 3.999999
Chroma gain 0 – 3.999999
Luma offset (gain =1) 511.75 – 511.75 in sample values
Chroma offset (gain = 1) 255.75 – 255.75 in sample values
5.7.2 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.
5.8 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, processes and reports the EDH
package without changing it in the video stream.