System and method for clock synchronization over...

Details System and method for clock synchronization over... System and method for clock synchronization over...

2005-07-19

2009-06-23

Ferris, Derrick W (Department: 2416)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

Reexamination Certificate

active

07551647

ABSTRACT:
Embodiments of the invention enable the synchronization of clocks across packet switched networks, such as the Internet, sufficient to drive a jitter buffer and other quality-of-service related buffering. Packet time stamps referenced to a local clock create a phase offset signal. A shortest-delay offset generator uses a moving-window filter to select the samples of the phase offset signal having the shortest network propagation delay within the window. This shortest network propagation delay filter minimizes the effect of network jitter under the assumption that queuing delays account for most of the network jitter. The addition of this filtered phase offset signal to a free-running local clock creates a time reference that is synchronized to the remote clock at the source thus allowing for the transport of audio, video, and other time-sensitive real-time signals with minimal latency.

REFERENCES:
patent: 6449291 (2002-09-01), Burns et al.
patent: 6751228 (2004-06-01), Okamura
patent: 2004/0141527 (2004-07-01), Bennett et al.

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