TIA's Glossary of Telecommunication Terms

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lip synchronization

The synchronization of audio and corresponding video signals so that there is no noticeable lack of simultaneity between them. (188) Note: An example of a lip synchronization problem is the case in which television video and audio signals are transported via different facilities (e.g., a geosynchronous satellite link and a landline) that have significantly differently delay times, respectively. In such cases it is necessary to delay the audio electronically to allow for the difference in propagation times.