Cobalt Digital COMPASS 9086 Embedded Audio Loudness Processor - Manual (Page 42)

3
9086 Function Submenu List and Descriptions
3-14 9086-SD PRODUCT MANUAL 9086-OM (V4.3)
(continued)
• Minimum Latency 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).
(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.
For example, with a 1080i59.94 output, the maximum allowed
setting is 5. For a 1080i film (23.98) output, the maximum allowed
setting is 3. Conversely, greater maximum settings are allowed for
SD formats such as 525i59.94, where 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.
• Audio Hard Resync Threshold Control 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 high
enough to accommodate normal on-air offsets allows on-air resync that is
glitch-free.
(Range is 1.5 to 13.0 frames in 0.1 frame increments)
Table 3-2 9086 Function Submenu List — continued
Video:
40 msec
t
Audio:
440 msec
With offset greater than selected hard resync
threshold, resync is immediately applied.
9
12
In this example, initial offset of 400 msec (appr. 12 frames) is
above 9 frame threshold and results in immediate hard resync.
Note: In normal operation with Loudness Processing enabled, audio resync, if necessary, is always applied as a hard
resync. Input SRC is disabled when loudness processing is running.