LipTracker is a non-invasive measurement tool for in-service lip sync analysis. After detecting a face in the video,

LipTracker compares selected sounds in the audio with the mouth shapes that create them in the video. The relative

timing of these sounds and corresponding mouth shapes (called Mutual Events or MuEvs) is analyzed to produce

a measurement of the lip sync error. Audio offsets of up to ± 5 video frames can be measured. This unique approach

of analyzing real time video and audio content does not require the insertion of cues, codes or watermarks into the

program material. Therefore, LipTracker can be used at any point in the transmission path.

              

The numeric and graphic displays of the current audio offset are updated periodically until the current face is lost or

a new face is detected. The history graph charts the most recent error profile and event logging saves the results for

scene by scene analysis. The Audio Offset Status indicator is a visual warning of the current offset. User

programmable thresholds determine whether the indicator is Green, Yellow or Red at any given offset reading.