Grass Valley 8985FS v.1.2.0 - Manual (Page 47)

8985FSP/FS/PRC — Instruction Manual 47
Configuration
Delay Wrap Position
This indicator will display with a blue bar, the fraction of the final frame of
actual video delay through the frame sync. It will not indicate if multiple
frames have been selected with the Multi-Frame Delay control.
For example, with 1080i video and Minimum Delay Mode not selected, if
600 lines plus 5 frames of delay is entered by the user, that actual delay
through the module will be anywhere from about 6 to 7 frames depending
on the following conditions:
a. If the module is in Delay (Input-Timed) Mode, the delay through
the module will be about 6.5 frames, and the Delay Wrap Position
will be at about 50% of full scale.
b. If the module is in Frame Sync (Genlock) Mode, the delay through
the module will be about 6.5 frames if the input video has zero
delay with respect to the genlock reference frame position, and the
Delay Wrap Position will be at about 50% of full scale. As this input
video delay with respect to the genlock reference frame position is
changed from -0.5 to +0.5 frame periods, the delay through the
module will change from about 6 to 7 frame periods, with the Delay
Wrap Position changing from about 0 to 100% of full scale.
In summary, the Electrical Length of the module can be estimated as the fol-
lowing:
• 1 frame minus 5 lines (Minimum Delay Mode not selected), or
• 150 pixels (Minimum Delay Mode selected) + Multi-Frame Delay +
Delay Wrap Position (% of full scale) X (1 frame period).