Method for improving signal generator frequency precision using counters
 A method for improving the precision of a signal generator utilizing counters. The difference between an external standard signal frequency and an internal standard frequency is measured by digital counters. The signal of this internal standard frequency signal source is counted by a first counter and the frequency of an external standard frequency signal source is counted by a second counter. A calculating and control part determines the accurate frequency of internal standard frequency signal source from count values of both counters. The measurement frequency signal source generates a signal with the desired frequency. The circuit is digitally implemented. 
Hewlett-Packard Company
G
G01R
inventional
Hideki
Yamashita