Patent ID: 9026831
Filing Date: 2015-05-05
Classification: H04L,H04N

Abstract:
1. A method of synchronous control for a synchronous control system provided with a master device and at least one slave device connected via a communications network, the method comprising steps of: the master device transmitting first time data to the master device and the at least one slave device via a hub upon detection of generation of a synchronization signal, the first time data indicating a time at which the synchronization signal is generated; the master device transmitting second time data to the at least one slave device upon reception of the first time data via the hub, the second time data indicating a time at which the first time data is received by the master device; each of the at least one slave device calculating, upon reception of the first time data and the second time data, an estimated generation time at which the synchronization signal is estimated to be generated by subtracting a time elapsed between the time indicated by the first time data and the time indicated by the second time data from time at which the first time data was received; and each of the at least one slave device controlling synchronization with the master device based on the estimated generation time.