SEL-1FS1/SEL-2FS1 and SEL-1XD1/SEL-2XD1
Installation and Operation Manual
Installation, Operation, and Specifications
© 2015 Imagine Communications Corp.
Proprietary and Confidential.
Version 2.8 | Page 48
AFD Block Diagrams
The illustration below shows different applications of AFD insertion and decoding.
Figure 30:
AFD Block Diagram
The AFD feature includes SD-SDI and HD-SDI configurations. See AFD Descriptions (on page 49) for
details.
AFD Diagram Explanation
In automatic format description,
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.
AFD, VI, and WSS-Based Aspect Ratio Control
When you set the ARC Control parameter to follow the aspect ratio codes (AFD, AFD-ALTR, AFD-Custom
Map, VI, VI-ALTR, VI-Custom Map, WSS, WSS-ALTR, and WSS-Custom Map), the aspect ratio control is
based on input AFD, VI, or WSS code. AFD-Custom Map, VI-Custom Map, and WSS-Custom Map make it
possible for you to perform automatic aspect ratio conversions based on the custom defined mapping
table. The other options set the ARC to an existing standard. When the input code is missing, the ARC
behavior is defined by Loss of AFD ARC, Loss of VI ARC or Loss of WSS ARC. Only one of these options is
be enabled at any one time.
Though they are not widely used, some AFD, VI or WSS codes recommend cropping part of the image.
When this type of cropping is enabled, the module will take longer to change ARC modes. To create
