Patent ID: 8401090

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