Operating instructions

GUIDE TO INSTALLATION AND OPERATION
38 | IRD-3802
Note that the PSIP RTT tables are not extracted. The rating information comes from the
standard MPAA and other North American rating systems.
Closed captioning data must be present in the MPEG video stream or XDS data will not be
inserted at the output
4.5 Using the Up/Down/Cross Option
The Up/Down/Cross Option allows the user to re-scale the input signal to any supported output resolution.
Possible conversions are:
Down scaling from 1080i to 720p (same frame rate)
Up scaling from 720p to 1080i (same frame rate)
Down scaling to 525 or 625 depending on frame rate
Up scaling from 525 or 625 to 720 or 1080i keeping same frame rate
In addition to resolution conversion, the option allows aspect ratio conversion to occur. The user can either
manually select the desired conversion method or use the AFD from the source to automatically resize the
picture. In manual mode, the following scaling options are available:
• NONE: No aspect ratio conversion done. Any 16:9 pictures will appear as anamorphic
16:9 if down converted to SD.
• AUTO: The scaling method is selected automatically. In this mode, the AFD flag is
used along with the aspect ratio of the output to select the best method. If no
AFD is present, the default AFD flag is used.
• STRETCH: Use this mode to stretch the picture vertically. This mode is useful when the
input picture has the wrong aspect ratio.
• CENTER CUT: When converting from 16:9 to 4:3, use this to crop both sides of the picture and
fill the entire screen while keeping the aspect ratio.
• LETTER BOX: Adds black curtains to the 16:9 picture for 4:3 monitors
• PILLAR BOX: Adds black bars to the 16:9 picture to properly display 4:3 images on 16:9
monitors.
Some modes may not apply depending on the input signal and desired output format.
If the selected mode is not possible the result will be the same as if NONE was selected.
The AUTO mode will use the input AFD to automatically choose the best rescaling method. The decisions
follow the CEA-CEB16 recommendation for receivers/decoders.
4.6 About AFD processing
According to ATSC A/53 part 4, AFD and BAR data can be carried in MPEG signals. The AFD information
and BAR data are extracted from the MPEG signal if present.
The user can configure the IRD to trigger on the AFD flags to automatically rescale the picture so that it is
optimally displayed. Alternatively, the user can set the scaling mode to OFF and simply carry the AFD flags
to the outputs for further processing. A card like the XVP-38xx from Miranda could then use the flag to
rescale the picture properly.