Grass Valley iControl V.6.02 - Manual (Page 458)

Fingerprint Comparison and Analysis
GSM Alarm Browser—Lip-Sync Detection Alarms
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The Fingerprint analysis alarms are as follows:
Fingerprint analysis alarms
Alarm name Applicability (based on
comparison mode)
Alarm
state
Description
Lipsync
detect
Video
comp
Audio
comp
Audio match
level YES NO YES Normal For each audio channel in the comparison group, the status of
this alarm represents the level of match between the
reference signal and the Probed signal. Normal indicates a
good match
Minor Marginal match
Critical Poor match, or no match at all.
Unknown There is no fingerprint data available for analysis,
e.g. fingerprint presence error, comparison just started, etc.
Lip-sync delay YES NO NO Normal Normal if lip-sync delay value is within the audio-lead and
audio-lag thresholds. Text value represents the current
audio/video delay difference in msec. at the probed point
when compared to the reference. A positive value (+) indicates
that audio is late with respect to the video (lagging). A
negative value (-) indicates that the audio leads the video. The
precision is +/- 1 msec.
Critical Critical if lip-sync delay is outside of audio-lead and audio-lag
thresholds.
Unknown This can arise for either of two possible reasons:
• There is no fingerprint data available for analysis
(e.g. fingerprint presence error, comparison just started).
• The audio or video match level is too low for computing
the lip sync ( e.g. audio silence, low motion video, unlocked
audio/video)