Imagine Selenio X50, Installation And Operation Manual, Page: 46 / 136

Chapter 3
Controls
32
AFD transmits data in the VANC space of the SDI signal, enabling both 4:3 and 16:9
television monitors to optimally present video with preset ARC and safe area information.
Without AFD, converted video may appear distorted or “cut off” when it appears on
different monitors.
See Figure 3-6 on page 32 for a comparison of AFD and non-AFD aspect ratio conversion.
Figure 3-6. AFD and Non-AFD ARC
VI provides embedded code in 525-line and 625-line component digital video signals. This
code makes it possible for picture and program related source data to be carried in
conjunction with a video signal.
WSS is embedded code in a 625-line system. It contains information on the aspect ratio
range of the transmitted signal and its position as it would appear on a conventional 4:3
display.
Figure 3-8 on page 34 and Figure 3-9 on page 35 show the different AFD, VI, and WSS
code selections. Figure 3-7 on page 33 explains the meanings of the diagrams.
SD-SDI 4:3
HD-SDI 16:9
Full frame Pillarbox
Down
Up
Postage stamp
Full frame
SD-SDI 4:3
16:9 Letterbox
SD-SDI 4:3
Up
Postage stamp
Full frame
HD 16:9
Using active format
description (best result)
Without active format description
(undesirable result)
Using active format
description, the original image
information is maintained
throughout the entire
conversion , creating the best
possible viewing area .