AJA UDC - Manual (Page 9)

UDC Mini-Converter v2.3r1 www.aja.com 9
content of the16:9 HD input video on the 4:3 SD output. For example, if the input
AFD code is 10 (Full Frame), it means that the input video has important picture
information throughout the full 16:9 frame, so the Downconverter should use
Letterbox mode to be sure none of the content is cropped off. An AFD code of 9
(Pillarbox) says that the input video only has content within the center 4:3 area of the
picture (usually because it originally came from an Upconverted SD signal) so the
Downconverter Crop mode would be the best choice. There are 16 possible HD AFD
codes, of which 8 are in common use. The UDC does not process or use SD AFD
codes.
SD Aspect Ratio
Convert
This mode selects the type of SD-to-SD Aspect Ratio Conversion (ARC) performed on an
incoming selected SD source. This mode is in effect only when the input and output are
both SD (525i or 625i). (In Europe 16:9 anamorphic video is also known as “wide screen”
video.)
Figure 5. SD Aspect Ratio Conversion Examples
Selection Descriptions Off–Turns aspect ratio conversion Off.
Letterbox–Converts 16:9 Anamorphic video to Letterbox video.
H Crop–Converts 16:9 Anamorphic video to 4:3 Standard video (crops left and right
edges of video).
Pillarbox–Converts 4:3 Standard video to 16:9 Anamorphic video.
H Crop
Pillarbox
V Crop
14:9
Off
(no conversion)
Letterbox
4
3
4:3 Converts To These displays on 4:3