| 摘要 |
PURPOSE:To attain the phase tracing with less fluctuation width and wide range by dividing equally each step operated by a microcomputer into (n) and applying phase tracing in the unit of steps while checking a phase tracing circuit during the (n) circulation. CONSTITUTION:Each step is divided equally into (n), in a phase synchronism system comprising a phase difference detecting circuit and the microcomputer muCM having an LPF and a delay and advance information storage section 4-1, changing the number of steps where the muCM is operated and tracing the phase. the muCM is provided with a check circuit deciding means 6 deciding how many times the phase is to be traced based on the information of the storage section 4-1 and a change discriminating means 7 discriminating whether or not it is required to change the step designating position operated by the muCM. The operating step position is decided by the means 7 and the phase tracing in the unit of steps divided by the number of times of check of the means 6 is performed. |
