Video synchronization

Details Video synchronization Video synchronization

2004-03-30

2011-12-06

Kelley, Christopher S (Department: 2482)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C348S500000, C348S521000, C348S525000

Reexamination Certificate

active

08073060

ABSTRACT:
A method of synchronizing the phase of a local image synchronization signal generator of a local video data processor in communication with an asynchronous switched packet network to the phase of a reference image synchronization signal generator of a reference video data processor also coupled to the network, the local and reference processors having respective clocks, the reference and local image synchronization signal generators generating periodic image synchronization signals in synchronism with the reference and local clocks respectively comprises the steps of:frequency synchronizing the local and reference clocks;the reference video data processor sending, via the network, to the local data processor an image timing packet providing reference image synchronization data indicating the difference in timing, measured with respect to the reference processor's clock, between the time at which the image timing packet is launched onto the network and the time of production of a reference image synchronization signal; andthe local processor controlling the timing of the production of the local image synchronization signal in dependence on the reference image synchronization data and the time of arrival of the timing packet.

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“Information Technology—Generic Coding of Moving Pictures and Associated Audio Information: Systems” ITU-T Recommendation H.222.0, XX, XX, Feb. 2000, pp. I-XVI,1, XP001032469.

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