Audio and video clock synchronization in a wireless network

Details Audio and video clock synchronization in a wireless network Audio and video clock synchronization in a wireless network

2004-05-18

2010-02-23

Philippe, Gims S. (Department: 2621)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C370S329000

Reexamination Certificate

active

07668243

ABSTRACT:
System and method for synchronizing clocks and maintaining packet timing relationships in a wireless communications system. A preferred embodiment further comprises periodically synchronizing local clocks at a transmitter and a receiver to a clock reference, adding a timestamp to each application packet at a transmitter of a wireless network, setting the timestamp to a value of a local time at the transmitter plus a link delay, buffering a received packet at a receiver, and releasing the buffered packet to an application level when a value of a local time at the receiver equals the timestamp value in the packet. This can help to ensure that the timing relationships between data packets present at a transmitter is maintained at a receiver, regardless of transport delays (waiting, transmission and processing) incurred by the data packets.

REFERENCES:
patent: 6868125 (2005-03-01), Gendel
patent: 7269151 (2007-09-01), Diener et al.
patent: 2004/0208158 (2004-10-01), Fellman et al.
patent: 2005/0182856 (2005-08-01), McKnett
patent: 2007/0100473 (2007-05-01), Shvodian et al.
Shvodian, W.M., et al., “Synchronization of Isochronous Streams Over a Wireless Communication Link,” U.S. Appl. No. 60/483,629, filed Jul. 1, 2003, 22 pages.

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