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X50
Installation and Operation Manual
31
Aspect Ratio Conversion
You can set the output aspect ratio conversion using Custom , Standard , or Automatic
controls. These three methods are found in the ARC Preset parameter, with the following
options.

Custom

Standard ARCs

Anamorphic

4:3 Pillar Box

14:9 Pillar Box

16:9 Cut

4:3->21:9 Ltr

16:9 Letter Box

14:9 Letter Box

4:3 Cut

16:9->21:9 Ltr

Automatic ARCs

AFD

AFD - ALTR

VI

VI - ALTR

WSS

WSS - ALTR
Depending on the current conversion mode (Up, Down, Cross, or SD-ARC), different
subsets of these options will be in effect. Thus, for example, an ARC setting that is visible in
upconversion may not be visible in downconversion.
Note : In some regions, SD-SDI normal analog blanking is not part of the 4:3 active video
area, causing the 4:3 image to have an active video length of 702 (PAL/625) or 704 (NTSC/
525) instead of 720. In these situations, the ARC will need adjustments. Use the
SD Width
parameter ( Video > Scalar x > Advanced ) to set the module to either 720 (default) or
702(PAL)/704(NTSC) .
Custom ARC To make a custom ARC setting, select options in the Advanced , Variable , and Crop
parameters of Scalar 1 and Scalar 2 .
Note: When individual values are matched with a particular pre-defined standard aspect
ratio, ARC Preset will change, to reflect that matching standard aspect ratio.
Automatic
ARC
Active Format Description (AFD), Video Index (VI), and Wide-Screen Signalling (WSS) are
different systems in which embedded data automatically control the output aspect ratio.
When you set
ARC Preset to AFD , AFD-ALTR , VI , VI-ALTR , WSS , or WSS-ALTR, the X50
converts the aspect ratio according to the upstream AFD, VI, or WSS code.
The x-ALTR versions of these options interpret the code in an alternative way.