3
9921-FS Function Menu List and Descriptions
3-22
9921-FS PRODUCT MANUAL
9921-FS-OM (V1.18)
(continued)
• Pattern Select
Provides a choice of standard technical patterns (shown to the left) when
Test Pattern is invoked.
• Output Video Reference Offset Controls
With framesync enabled, provides the following controls for offsetting the
output video from the reference:
• Vertical (Lines) – sets vertical delay (in number of lines of output video)
between the output video and the frame sync reference. (Positive values
provide delay; negative values provide advance)
(Range is -1124 thru 1124 lines; null = 0 lines.)
• Horizontal (
µ
s) – sets horizontal delay (in
µ
s of output video) between the
output video and the frame sync reference. (Positive values provide delay;
negative values provide advance)
(Range is -64 thru 64
µ
sec; null = 0.000
µ
sec.)
Note: Offset advance is accomplished by hold-off of the reference-directed
release of the frame, thereby effectively advancing the program video
relative to the reference.
• Minimum Latency Frames Control
Minimum Latency Frames Control
When Framesync is enabled, specifies the smallest amount of latency
allowed by the frame sync (latency measurement in output video frames).
The frame sync will not output a frame unless the specified number of
frames are captured in the buffer. The operational latency of the frame
sync is always between the specified minimum latency and minimum
latency plus one frame (not one field).
Note: Due to card memory limits, the maximum available Minimum Latency
Frames is related to the output video format selected.
For example, with a 525i59.94 output, the practical maximum limit is
13.
When using this control, be sure to check the Framesync Status
display as follows:
• Latency frames selection within limits.
• Latency frames selection exceeds limits.
Table 3-2
9921-FS Function Menu List — continued
