Patent ID: 7787576

Claim:
An improved time synchronized measurement system of the type having a master device and a slave device, the master device and the slave device each having a time measurement device for assigning a relevant time of sending and/or receiving a piece of measurement information, and the master device further having a reference clock pulse-generating device for transferring to the slave device a reference clock signal generated by the reference clock pulse-generating device, further comprising: means for modulating the reference clock signal with a piece of information on a common time basis for the master device and the slave device to produce a modulated reference clock signal, wherein the modulated reference clock signal comprises a signal where a logic “0” is defined by a first period of the reference clock signal having a 75/25 duty cycle and a second period of the reference clock signal having a 25/75 duty cycle, and a logic “1” is defined by two periods of the reference clock signal having a 75/25 duty cycle followed by two periods of the reference clock signal having a 25/75 duty cycle or alternatively by two periods of the reference clock signal having a 25/75 duty cycle and followed by two periods of the reference clock signal having a 75/25 duty cycle; wherein the modulation comprises a signal agreed between the master device and the slave device that defines a system time start, and wherein the modulation comprises a current time related to the common time basis that is transmitted in an encoded form as the agreed signal.