Patent ID: 7869467

Claim:
A receiving device, comprising: a receiving unit receiving a first packet from a transmitting device via a network and outputting a second packet included in the first packet; and a processing unit receiving the second packet and implementing processing based on a receiving side reference clock on the second packet, wherein the receiving unit comprises a clocking circuit performing a clocking operation synchronously with a network clock, and a packet output circuit outputting the second packet and outputting a control signal indicating normality or abnormality of output timing of the second packet based on a result of comparing a time of the clocking circuit and a time of first time information included in the first packet; and the processing unit comprises a clock adjusting circuit synchronizing, when the second packet includes second time information indicating a time based on a transmitting side reference clock and when the control signal indicates normality, the receiving side reference clock with the transmitting side reference clock based on a result of comparing a time based on the receiving side reference clock and a time of the second time information, wherein when the time of the clocking circuit is after the time of the first time information, the packet output circuit outputs the second packet and outputs the control signal indicating abnormality; when the time of the clocking circuit is before the time of the first time information, the packet output circuit outputs the second packet and outputs the control signal indicating normality after waiting until both the times of the clocking circuit and the time of the first time information match due to a change of the time of the clocking circuit; and when the time of the clocking circuit matches with the time of the first time information, the packet output circuit outputs the second packet and outputs the control signal indicating normality.