Tektronix SPG8000A, Руководство пользователя

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SPG8000A User Manual 97
These settings are available for the Ancillary Data Output:
•
Field : Use the drop- down list to set the Field to carry the ancillary data
payload. Select between Field 1 Only , Field 2 Only , and Field 1 & 2 .
This menu setting is available only in interlaced formats.
•
Field1 Line : Enter a line number in Field 1 to carry the ancillary data
payload. This menu setting is available only in interlaced formats.
•
Field2 Line : Enter a line number in Field 2 to carry the ancillary data
payload. This menu setting is available only in interlaced formats.
•
Sample Offset
: Enter the sample number where the ancillary data header
will be. This is the first word of the ancillary data packet.
Note: Be sure to change the sample offset when you change the raster size.
Otherwise, the ANC insertion may occur in an unexpected place or even be
outside the raster structure. The sample offset is set relative to SAV to use
standard sample numbering. However, this means that the most normal location
at the start of HANC varies as a function of raster size.
•
Video Channel : Use the drop- down list to set the video channel to Luma
or Chroma .
•
Link Location
: Use the drop- down list to set the link location to
Link A
or Link B . This menu setting is available only in 3G Level B formats.
•
Stream Location
: Use the drop- down list to select
HD Stream1
or
HD
Stream2
. This menu setting is available only in 2×HD formats.
• Output Continuously : Select this check box to continuously output an
ancillary data payload into the SDI video signal. When the check box is
cleared, the ancillary data payload output is disabled.
• Insert Single Packet : When the Output Continuously check box is cleared,
click Insert Single Packet to insert one packet on one field into the SDI
video signal.
SDI ancillary data payload
example
As an example, one of the ancillary data payloads that can be easily generated
by the instrument is the Active Format Description (AFD). AFD is a method of
identifying the active area of the video picture to be displayed. Using AFD the
aspect ratio of the picture can be automatically optimized for the display being
used. AFD is defined in SMPTE 2016 - 1, and mapping AFD and bar data is
defined in SMPTE 2016 - 3. The packet format appears as shown here:
Note: This is an example only. Inserting an AFD packet will not affect the SDI
video produced.