GUIDE TO INSTALLATION AND OPERATION
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| IRD-3101
Replace:
Will use the PSIP information to replace any existing XDS data. Use this option if you know
you want to use the PSIP advisory.
Pass:
If XDS data is already present, it is left untouched. In this mode, no V-CHIP is generated if no
XDS data is present.
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 Conversion Option
The Up Conversion Option allows the user to upscale the input signal 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.
•
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.
