Audio-Video Synchronization Across DTV Transport Interfaces: The Impossible Dream?

The end-to-end DTV production, distribution, and broadcast system is a complex assemblage of many digital processing and storage devices. A number of interfaces are required to transport the compressed and uncompressed DTV audio and video signals between devices in the system. — Each component of the DTV system imposes its own latency on the audio and/or video signals flowing through it, and the delays imposed on audio and video signals respectively are typically unequal, compromising audio-video synchronization. It is incumbent on those implementing DTV production, post production, and broadcast systems to be aware of the latencies present at each interface, and to take steps to correct synchronization errors at each stage, thereby preventing the buildup of lip sync errors. This paper will discuss the potential trouble spots within the DTV system.

Published

1999-11

Content type

Original Research

DOI

10.5594/M00341

ISBN

978-1-61482-931-7