| 摘要 |
PROBLEM TO BE SOLVED: To improve the accuracy of a clock function to acquire accurate current time even if an oscillator such as a quartz oscillator is inexpensive. SOLUTION: This interphone system is provided with an internal clock part having the clock function for counting clocks generated from the oscillator, measuring prescribed unit time by counting a prescribed number of clocks, adding the prescribed unit time to current time information, and acquiring and updating current time information. The interphone system is provided with a clock function precision correction means for correcting the precision of the clock function of the internal clock part by inputting operation to an operating part. COPYRIGHT: (C)2007,JPO&INPIT |
