AJA FS2 - Manual (Page 171)

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173 FS2 Installation and Operation Manual — Video 1 & 2 Screens
Downcvt AFD
Dflt Downconvert AFD Default selects how the Video Processor will operate when
Downconvert Mode has been set to Auto AFD and no AFD codes are detected at the
selected input source (that is, this menu selects the default Downconversion to use
when AFD is absent). This parameter is in effect only when the input is HD (720p,
1080i, or 1080p) and the selected output format is SD (525i or 625i).
Caption Xlator The Caption Translator setting translates closed captioning from the SD CEA-608
format on line 21 to the HD CEA-708 format and inserts it into the HD output video
stream.
Note: This parameter interacts with SD Line 21 Blanking; see the explanation for
that setting also.
In standard definition video (525i59.94), closed captioning data is encoded and sent
on line 21 of both fields, using a format defined by the Consumer Electronics
Association standard, CEA-608. This is traditionally called “line 21", “SD”, or “608”
captioning, and is used for analog composite, analog component, and serial digital
(SDI) video.
In high definition video, closed captioning is encoded and sent as Vertical Ancillary
(VANC) packets in SDI video, using a format defined by the Consumer Electronics
Association standard CEA-708 (there is no equivalent for analog HD video). This is
traditionally called “HD,” “DTV,” or “708” captioning.
(17.3) Downconvert AFD Selections Selection Descriptions
Hold Last (default)
Crop
Anamorphic
14:9
Letterbox
Use the last detected AFD code and continue to use its aspect ratio until
a new AFD code is detected again in the SDI metadata.
When AFD code is absent, switch the Downconverter mode to Crop.
When AFD code is absent, switch the Downconverter mode to
Anamorphic.
When AFD code is absent, switch the Downconverter mode to 14x9.
When AFD code is absent, switch the Downconverter mode to
Letterbox.
(18) Caption Xlator Selections Selection Descriptions
On
Off (default)
When set to On and using the UpConverter, the FS2 will automatically
translate incoming line 21 captions to CEA-708 format and insert the
VANC packets into the converted HD video stream. This is a complete
translation from CEA-608 format to CEA-708 format (including the
embedded SD captions).
When set to On and using the Downconverters, the FS2 will
automatically intercept and reformat the SD caption data in the
incoming CEA-708 VANC packets, and output it on line 21 of the
standard definition outputs.
When Off, caption translation is not performed.