Data Translation MACH Series, Руководство пользователя

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Principles of Operation
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The following sections describe the active video area and the frame
within the active video area that you want to digitize.
Active Video Area
The active video area floats in the total video area. The active video
area is defined as that part of the incoming signal that contains valid
video data (not blanking or sync information). Therefore, the active
video area consists of the visible portion of those lines containing
visible pixel data.
Using software, you can define the active area for the DT3152-LS
board. The following sections describe how to use the settings of the
board to define the horizontal and vertical components of the active
video area.
Table 2: Total Video Area Settings (Area-Scan Mode Only )
Setting Description Range
Nominal
Values
Total Pixels per Line The total number of pixels in a
single horizontal line of video,
where a horizontal line is
defined as the area between
two consecutive horizontal
sync signals. 4 to 4096
a
pixels
a. The granularity is 1.
50 Hz: 960
60 Hz: 794
Total Lines per Field The total number of lines in a
single field of video, where a
field is defined as the area
between two consecutive
vertical sync signals. 1 to 4096
a
lines
50 Hz: 312
60 Hz: 262