The synchronization of audio and video (A-V sync, or lip sync) in television continues to pose a problem for
producers and broadcasters, because errors in synchronization continue to be a source of audience
dissatisfaction.
Although digital television includes timing information that should keep audio and video properly
synchronized, this in itself can simply be another source of problems. New display technologies, and separate
audio and video signal paths within the living room, present new challenges for lip sync.
This project was started in an effort to help with creating the solution to the problem. It had the aim of
standardizing a simple method of measuring lip sync. The task proved more difficult than anticipated and the
project was subsequently closed. However this report gathers together two relevant documents that were
produced by the British Broadcasting Corporation during the life-time of the project. One is a study of factors
that affect perception of lip sync, the other is a study of operational practices in a real broadcast chain.
Posted: Friday, December 4, 2009
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