Cobalt Digital Inc 9083 Product Manual page 63

Operating Instructions
Table 3-2 9083 Function Submenu List — continued
• Minimum Latency Control
Minimum Latency Frames Control
• Audio Hard Resync Threshold Control
With offset less than selected hard resync threshold, resync is progressively applied in many small steps to provide a
seamless, glitch-free retiming. After the successive steps, the audio is synchronized with the video (in this example, 40
msec). (Progressive correction is applied at 1 msec/sec appr. rate.)
Video:
40 msec
With offset greater than selected hard resync
threshold, resync is immediately applied.
Video:
40 msec
9083-ENC-OM (V4.4)
(continued)
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).
(Maximum range is 0 to 32.)
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.
Sets threshold at which hard resync is applied if audio-video offset
exceeds threshold (see below). Hard resync provides fastest snyc-up
suitable for off-air manipulation. Conversely, a threshold setting that
avoids hard resync allows glitch-free on-air manipulation.
(Range is 1.5 to 13.0 frames in 0.1 frame increments)
6
9
Audio:
In this example, initial offset of 200 msec (appr. 6 frames) is
240 msec
below 9 frame threshold and results in soft resync being
progressively applied.
9
In this example, initial offset of 400 msec (appr. 12 frames) is
above 9 frame threshold and results in immediate hard resync.
9083 (WITH DOLBY ENCODING OPTION) PRODUCT MANUAL
9083 Function Submenu List and Descriptions
t
12
t
Audio:
440 msec
3-15