| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wireless master-and-slave clock system, a master clock, and a slave clock capable of easily increasing the number of installed clocks. <P>SOLUTION: The slave clock of the wireless master-and-slave clock system is provided with a JJY encoder 1C, a power control means 1D, a transmitter 1E, and an antenna 1F. The time of a time measuring means 5 secured in time accuracy on the basis of first time information from the master clock is sent at a frequency the same as a long wave standard wave, and second time information of a modulation system is sent by radio with small electric power not receiving mandatory control nor requiring a permit. By this, a radio wave correction clock with time corrected by the long wave standard wave can be used as a substitute for the slave clock, and the number of installed clocks can be increased easily. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
