Vertical Shift Of The Caption Line Data; Configuring Whether Upstream Captions And Xds Will Be Passed Or Blocked - evertz 8084 Instruction Manual

>CAPTION SHIFT
Shift off
Shift on
>PASS UPSTREAM
C1234 T234 X
If the encoder being configured is the first XDS (including V-Chip) encoder in
the video path, or the user does not want to preserve any upstream field 2
data, we recommend that all of the data streams in field 2 (CC3, CC4, T3, T4,
XDS) should be placed in the NULL (blocked) state.
OPERATION
Models 8084/8084AD/8085 Closed Caption Encoder Manual
3.3.5

Vertical Shift of the Caption Line Data

It is common for 4:2:2 component to NTSC video encoders to add setup to
line 21 regardless of whether there is closed caption information on line 21
or not. Closed caption data generated at 0 IRE on component video will be
translated to 7.5 IRE when setup is added by the video encoder.
The EIA 608-B waveform specification says that there should be no setup
on line 21. In order to eliminate the setup when the encoding to NTSC
video takes place, it is necessary to shift the caption data down by 7.5 IRE
when it is generated by the caption encoder. Unfortunately, in order to shift
the caption data down by 7.5 IRE it is necessary to use digital video values
that are not legal according to the SMPTE 125M Component Digital Video
specification.
CAPTION SHIFT is used to select whether the caption data encoded
on the SDI video will be shifted to adjust for setup on line 21.
Select Shift off to encode captions at 0 IRE on 4:2:2 video
signals. The resulting closed caption signal will contain legal
SMPTE 125 data values but may have 7.5 IRE of setup added
when it is encoded to a composite video signal. (Depending on
the video encoder)
Select Shift on to encode captions at -7.5 IRE on 4:2:2 video
signals. The resulting closed caption signal will contain illegal
SMPTE 125 data values but may have the 7.5 IRE of setup
cancelled out when it is encoded to a composite video signal.
(Depending on the video encoder)
3.3.6 Configuring Whether Upstream Captions and XDS will be
Passed or Blocked
The PASS UPSTREAM menu item allows the user to control whether
individual Data streams will be passed or blocked. When you press the
or keys the display shows a character to represent each data stream,
CC1 through CC4, T1 through T4 and XDS, as follows:
C1234 T1234 X
Pressing the or
selected (blinking). The SELECT key toggles whether the selected stream
is passed or blocked. If a particular data stream is being blocked, the
character representing that stream will change to a dash '-'.
Revision 1.6.6
keys will change which data stream is currently
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