| 摘要 |
PURPOSE:To take timepiece synchronism with practically sufficient accuracy even when transmission delay varies by calibrating the timepiece built in an apparatus to be controlled on the basis of the timepiece renewing start signal transmitted from a network control apparatus. CONSTITUTION:The first transmission means 3 of a network control apparatus 1 transmits a master timepiece information signal (information signal) for performing the synchronous operation of a timepiece to an arbitrary apparatus to be controlled and a time measuring means 4 starts the measurement of a time simultaneously with the transmission of the information signal and a receiving means 5 receives the master timepiece receiving response signal (response signal) from the apparatus to be controlled to stop the measurement of the means 4. The second transmission means 6 transmits a timepiece renewing start signal to an arbitrary apparatus to be controlled. The first detection means 19 of an arbitrary one of apparatuses 15-17 to be controlled detects the information signal to immediately return the response signal and an elapsed time measuring means 20 is started when the means 19 detects the information signal to measure an elapsed time. The second detection means 21 receives the timepiece renewing start signal to determine the present time from the time length data and transmission time data contained therein and the measured value of the means 20 and calibrates a timepiece 18 to make the same synchronous with a master timepiece 2. |
