Cobalt Digital COMPASS 9822 Downconverter - Manual (Page 57)

9822-OM (V4.1) 9822 PRODUCT MANUAL 3-25
Operating Instructions
9822 Function Submenu List and Descriptions
(continued)
• Audio Offset Control Adds or reduces (offsets) audio delay from the matching video delay
(audio delay offset setting adds or removes delay in addition to any delay
included by other actions). This control is useful for correcting lip sync
problems when video and audio paths in the chain experience differing
overall delays.
(-575.0 msec to 575.0 msec range; null = 0.0 msec)
Note: Delay offset values of less than approximately 1 frame are
progressively applied by the card to provide a seamless, glitch-free
retiming. However, delay offset values exceeding 1-1/2 frames may
result in a slight audio discontinuity at the moment when the offset
is applied using this control if the Audio Hard Resync Threshold
control is not at a setting greater than the delay offset.
To prevent this condition during an on-air manipulation, it is
recommended that the Audio Hard Resync Threshold control be
set high enough such that expected delay offsets exceeding 1-1/2
frames are progressively applied.
Note: If using Audio Offset control to perform off-air corrections, it is
recommended to temporarily set the Audio Hard Resync
Threshold control to its minimum setting, thereby allowing the
offset to be assessed and corrected as fast as possible.
• Current Audio Delay Display Displays the current input-to-output audio delay (in msec units) as well as
in terms of Frames/fractional frame (in number of lines).
• Video Delay Display Displays the current input-to-output video delay (in msec units) as well as
in terms of Frames/fractional frame (in number of lines).
• Framesync Status Display Displays the current framesync status as follows:
• Framesync status OK.
• Framesync Enable set to Off.
• Improper or missing framesync reference.
• Latency frames selection exceeds limits.
Note: See Minimum Latency Frames Control (p. 3-24) for more
information about this message.
Table 3-2 9822 Function Submenu List — continued