Data Translation DT3155, Руководство пользователя

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Principles of Operation
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Vertical Video Signal
Each field of video also contains blanking information and lines of
active video.
Figure 3 shows the components of a single vertical field
of noninterlaced video.
Note that the frame is an area that you establish within the active
video area. For information about the frame, refer to
page 16 .
Figure 3: Vertical Video Signal
Line measurements are relative to the vertical reference point , which
is defined as the beginning of the vertical sync. Lines themselves are
measured in terms of pixels.
The settings for the vertical video signal are fixed on the DT3155
board.
Blanking
0 1 2 3
n-1
Vertical Reference
Point
First Active Line
Frame Top
Frame Height
Active Video
Vertical Sync
Active Line Count
Total Lines Per Field