Cobalt Digital COMPASS 9085 Loudness Processor - Manual (Page 54)

3
9085 Function Submenu List and Descriptions
3-16 9085 PRODUCT MANUAL 9085-OM (V4.3)
(continued)
• 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)
Note: Glitch-free operation described here is available only with loudness
processing disabled and with card set to use an external reference.
• 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. To null loudness processing latent delay, this control can
be set to -8 msec to remove this latency.
(-575.0 msec to 575.0 msec range; null = 0.0 msec)
• 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).
Table 3-2 9085 Function Submenu List — continued
Video:
40 msec
In this example, initial offset of 200 msec (appr. 6 frames) is
below 9 frame threshold and results in soft resync being
progressively applied.
t
Audio:
240 msec
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
t
Audio:
440 msec
With offset greater than selected hard resync
threshold, resync is immediately applied.
9 6
9
12
In this example, initial offset of 400 msec (appr. 12 frames) is
above 9 frame threshold and results in immediate hard resync.