Grass Valley 8990ARC v.3.0 User Manual
Page 19
8990ARC Instruction Manual
19
Configuration
This is done using the Data Lines control as follows:
•
When the Data Lines control is set to 1, the first active line of video is
treated as part of the vertical interval and passed to the output through
the VBI Bypass circuit maintaining any data it contains.
In the active video scaling circuit, this first active video line is blanked
before the active video is processed in the scaling circuit so that no
non-video information will appear on the video output. The last active
video line is also blanked to maintain symmetry on the video output.
•
When the Data lines control is set to 2, the first 2 active lines of video
are treated as part of the vertical interval in the VBI Bypass circuit.
These first 2 lines of active video are blanked before the active video is
processed in the scaling circuit. The last two lines of active video are
also blanked before the scaling circuit to maintain symmetry on the
video output.
•
When set to 3, the first three lines of active video are treated as vertical
interval lines in the VBI Bypass circuit. These first 3 lines of active video
are blanked before the active video is processed in the scaling circuit.
The last three lines of active video are also blanked before the scaling
circuit to maintain symmetry on the video output.
For the exact line number of the lines that are blanked with the different
Data Lines control settings for 525 and 625 line rates, refer to the parameter
for
Active lines blanked before processing by scaling circuit
Specifications section.