AJA FS2 - Manual (Page 110)

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20 SD Line 21
Blanking This parameter determines whether the FS2 blanks line 21 closed captioning data
prior to video processing of an SD 525i video input. (Line 21 normally occurs at the
top of the raster in the overscan area of video, so the presence of captioning data or
blanking does not interfere with the visible SD or Upconverted video.)
In Pass mode, the FS2 does not blank line 21 of the SD video input and passes the
unaltered video to the Video Processor for transformation. This is the setting to use
if there is no captioning data present on line 21 of a 525i video input.
In Blank mode, the FS2 copies and remembers the contents of SD line 21 and then
blanks those lines before transformation to ensure captioning data does not get
included in the transformed video. If the output video is SD 525i, the copied caption
information gets reinserted on line 21 of the output. If the output video is
Upconverted and parameter 18 Caption Xlator is On, the copied caption gets
translated into an HD caption and inserted into the transformed output (and if the
caption translator is Off, the HD output does not contain caption data). This is the
setting to use if the SD input includes a caption and you want to retain it at the
output (parameter 18 Caption Xlator must be On), or you want to blank it at the
output (18 Caption Xlator must be Off ).
In Auto Blank mode, the FS2 automatically detects presence or absence of line 21
caption data on the SD input. If no line 21 caption is present, the FS2 passes the
video unaltered. If line 21 data is detected, the FS2 copies the data, blanks line 21,
and reinserts translated captioning on the transformed HD output if parameter 18
Caption Xlator is On. If the Caption Translator is Off, the HD output will not contain
captioning. This is the setting to use if your SD input video sometimes contains
captions and other times does not, or if you are uncertain which setting to use.
20 SD Line 21 Blanking Selections Selection Descriptions
Blank (default)
Pass
Auto blank
In UpConvert or SD Aspect Ratio Convert modes, this setting blanks 525i
input video Line 21 caption data before conversion. Use this setting if
you want to strip caption data from the input or if you want to
translate caption data and reinsert it on the HD output (18 Caption
Xlator must be On to reinsert caption on the output.)
Passes input video unaltered to the converter and to the outputs. Use
this setting if no caption data is present on the 525i input.
The FS2 looks for Line 21 caption data on the video input. If no caption
data is found, input video passes to the converter unaltered. If
caption data is present, Line 21 is blanked before video conversion
occurs, and if 18 Caption Xlator is On, translated caption data gets
inserted on the HD output. If 18 Caption Xlator is Off, the HD output
will not include captioning data.