
GUIDE TO INSTALLATION AND OPERATION
IRD-3802 |
39
In any case, the embedded AFD flag at the output follows any transformation that might have occurred.
Therefore should the picture be rescaled, the embedded AFD reflects the actual status of the picture at the
output. For example, an MPEG signal in full 16:9 (AFD code 8) down converted to SD 4:3 in letterbox will
have the AFD flag 10 inserted to signal letterbox.
Some restrictions apply to firmware revisions less than 211. The BAR data are not used and
AFD flags 4:3_4, 4:3_13, 4:3_14, 4:3_15 and the same in 16:9 are not supported. They
currently map to the default mode 8.
Alternatively to AFD, the user can select VLI or WSS (PAL only).
The charts below show the conversions that will be performed by the IRD-3802 when the Active Format
Descriptor (AFD) processing is activated. by selecting AUTO using the
Aspect Ratio Scaling Mode
pulldown
on the AFD tab of the Video Output panel.
In the images shown in the chart:
BLACK
Indicates that this portion of the transmitted image will be black
GREY
indicates Protected Area, consisting of picture content which may be cropped for optimum
display on screens with a different aspect ratio.
Input signal
4:3
Output
signal
16:9
16:9 Letterbox (top) image in a 4:3
frame
(4:3_2)
16:9 Letterbox (top) image in a 4:3
frame
(4:3_2)
16:9 Full frame image in a 16:9 frame
(16:9_8)
14:9 Letterbox (top) image in a 4:3
frame
(4:3_3)
14:9 Letterbox (top) image in a 4:3
frame
(4:3_3)
14:9 Pillar-box image in a 16:9 frame
(16:9_11)
> 16:9 Letterbox (center) image in a
4:3 frame
(4:3_4)
> 16:9 Letterbox (center) image in a
4:3 frame
(4:3_4)
> 16:9 Letterbox (center) image in a
16:9 frame
(16:9_4)