| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To maintain an accurate freerunning frequency by correcting an aging deviation of a freerunning center frequency of a voltage-controlled crystal oscillator. <P>SOLUTION: When the clock accuracy of a digital channel, to which a subordinate synchronization section 131 applies subordinate synchronization, satisfies specified accuracy, a correction section 133 receiving a correction instruction from a monitoring control section 108 performs a correction operation to use a subordinate synchronization control voltage obtained during the subordinate synchronization operation and given to a VC-OCXO 105 for a control voltage to determine the freerunning center frequency of the VC-OCXO 105 at freerunning by a freerunning setting section 132. <P>COPYRIGHT: (C)2004,JPO</p> |
