| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device for easily and accurately outputting a sine wave with the same frequency as that of an input sine wave and a phase synchronized with that of the input sine wave. <P>SOLUTION: A phase difference detection circuit 1 calculates a phase difference between a first sine wave input from the outside and a second sine wave output from a sine wave generation circuit 5 by digital signal processing. Since the phase and frequency of the second sine wave are adjusted on the basis of the calculation value, the sine wave generation circuit 5 can easily and accurately output the second sine wave whose frequency is equal to that of the input first sine wave and whose phase is synchronized with that of the first sine wave. <P>COPYRIGHT: (C)2007,JPO&INPIT |
