GRASS VALLEY ACAPPELLA -, Instruction Manual

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Acappella — Instruction Manual 77
Acappella Configuration Pages
Vertical and Horizontal Offsets
These controls allow you to adjust the vertical and horizontal offset of the
frame sync reference outputs independently. The adjustment parameters
for each control are given on the web page for each video format.
Before setting these controls it is important to understand that there is a
relationship between these Frame Sync offset controls and the offset con-
trols on the Router Reference Configuration web page.
The Vertical and Horizontal Offset controls on the Video Frame Sync Con-
figuration web page have a range of zero to one frame minus one pixel.
Depending on the position of the input video with respect to the reference
frame start, this offset will cause the electrical delay through the frame sync
to wrap around at 2 frames minus 5 lines. The full range of delay control is
from one frame minus 5 lines to 2 frames minus 5 lines. With the input
video aligned with the reference frame start, and zero frame sync offset, the
nominal electrical delay thought the sync is one frame period.