Wuxi Vimicro Corporation

Vimcro Corporation

Xiaoyu Gao

Techniques for synchronizing clocks are disclosed. According to one aspect of the present invention, a pair of dividing coefficients aand ais obtained from a ratio of a theoretical frequency fsof the first source signal to a theoretical frequency fs_local of a desired local clock signal. A least common multiple expressed as T_c is obtained from the theoretical periods Tand Tof the first source signal and the second source signal. A relative error expressed as k is calculated from the first and second source clock signals in a period of T_c. The first source clock signal is then divided into a first local clock signal with a period equal to T*aand a second local clock signal with a period equals to T*aaccording to the dividing coefficients aand a, respectively. The clock number m of the first local clock signal and the clock number n of the second local clock signal in the period of T_c are calculated according to the relative error k and the dividing coefficients aand a. The m clocks of the first local clock signal is mixed with the n clocks of the second local clock signal as m+n clocks of the desired local clock signal with the period of T_c. Thus, the local clock signal obtained as such is synchronized with both of the first and second source clock signals.

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Beijing, China

Xiaoyu Gao