Ross Opengear UDC-8625A Series, User Manual, Page: 60 / 174

4–2 • AFD UDC-8625A Series User Manual (Iss. 11)
Overview
The UDC-8625A series card uses the input and output AFD settings to configure the Aspect
Ratio Converter (ARC). The UDC-8625A series card uses the AFD to:
• determine where in the coded frame the active content is,
• define the protected area of the active content, and
• determine how to best display the active content in 16:9 or 4:3 format
The protected area is the section of the active content that must be displayed. The unused portion
of the image outside this protected area, such as the edges at the sides or the top, can be discarded
without affecting the overall content.
For More Information on...
• ARC examples, refer to the section “ Appendix C. ARC Setting Examples ” on
page 11-1.
Figure 4.1 provides an illustrative example of how an image in a 4:3 coded frame is defined by
the applicable AFD Codes.
Figure 4.1 Graphical Example of 4:3 Coded Frame Images
Aspect ratio greater than 16:9
Letterbox in a 4:3 Coded Frame
AFD Code:0100
14:9 Letterbox, Centered,
in 4:3 Coded Frame
AFD Code:1011
16:9 Letterbox, 4:3
Alternative Centered,
in 4:3 Coded Frame
AFD Code:1111
16:9 Letterbox at the top
in a 4:3 Coded Frame
AFD Code:0010
4:3 Full Frame
AFD Code:1000, 1001
4:3, Centered at 14:9,
4:3 Coded Frame
AFD Code:1101
14:9 Letterbox at the top
in a 4:3 Coded Frame
AFD Code:0011
16:9 Letterbox
in 4:3 Coded Frame
AFD Code:1010
16:9 Letterbox, 14:9
Alternative Centered,
in 4:3 Coded Frame
AFD Code:1110
Legend
This area of the picture may be cropped
Added Black Bars