HD3G7 HD 3 Gb/s SDI Video Generator
As an example, one of the ancillary data payloads that can be easily generated by
the HD3G7 module 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 de
fi
ned in SMPTE 2016-1, and mapping AFD and bar data is
de
fi
ned in SMPTE 2016-3. The packet format appears as shown here:
Where AR = aspect ratio (1=16:9, 0=4:3), T = top bar data
fl
ag, B= bottom bar
data
fl
ag, L = left bar data
fl
ag, and R = right bar data
fl
ag.
Note that these are all eight-bit values for the respective User Data Word. The
HD3G7 module will automatically calculate the parity bits when Parity is set to
Automatic, which is the default.
Most AFD codes do not require bar data information; only the
fi
rst user data word
needs to be de
fi
ned. For example, one common AFD code for a 16:9 coded frame
is ‘1001’ (9), which indicates a 4:3 image, horizontally centered, with pillarboxes,
as shown in the following
fi
gure:
Figure 3-93: AFD code ‘1001’ for a 16:9 coded frame
TG700 TV Signal Generator Platform User Manual
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Содержание TG700
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