Belden Grass Valley XVP-3901-DPI, Manual To Installation And Operation, Page: 48 / 87

GUIDE TO INSTALLATION AND OPERATION
42 | XVP-3901-DPI
5.5.5 SD Output – AFD tab
The Active Format Descriptor (AFD) flag is used to identify the
aspect ratio and protected areas of a video signal. The XVP-
3901-DPI uses this flag in some cases to adjust the output
aspect ratio and image cropping to obtain the best possible
presentation of the image. The AFD flag may be sent as a VLI
signal (RP 186), as a WSS signal (ITU-R BT.1119-2) for PAL
only, and as an AFD packet (SMPTE 2016).
When an AFD flag is present at the input, the card can
perform an automatic adjustment of the aspect ratio. See the
appendix for more details.
5.5.5.1 Default settings area
Default/Forced: this text box is labeled according to the
mode selected in the Input Screen pulldown in the Video
Output Group – see page 32.
•
In AUTO mode, labeled DEFAULT and shows the
current default AFD code to be used if no valid AFD
code is detected at the input.
•
In FORCED mode, labeled FORCED, and shows the
code that is forced into the system input regardless of
the actual input code.
•
In 4:3 (SD input) or 16:9 mode, the data box is empty
and the controls are grey
Change:
Click the Change button to open the Select AFD
panel showing the available AFD codes that could be
used as the default. Click on one to select it, then click
Apply or OK at the bottom of the panel.
Keep Last:
click in this checkbox to use the last detected
AFD code at the input as the default code to be used in
the
Auto mode when no AFD flag is detected. This box is
disabled in the Forced mode.
5.5.5.2 Config section
Incoming – the three types of AFD are shown, with a
presence icon for each, and a pulldown to establish the
priority of each type. The priorities are reset with each new
selection; e.g. if AFD is 1 and VLI is 2, and you use the
pulldown to choose VLI priority as 1, then AFD will be
bumped down to 2.
Figure 5-32 SD Outputs - AFD
Figure 5-33 Select AFD