| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure frequency variations of a signal to be measured with low electric consumption. SOLUTION: Each of a signal to be measured whose frequency changes according to change of the physical amount and an output signal from a reference oscillator are divided. Division periods of the respective signals are generated in different cycles, and cycle time differences between them are determined. The output signal from the reference oscillator in a plurality of close cycle time differences is counted, and frequency variations of the signal to be measured are measured from the total sum of the counted values. COPYRIGHT: (C)2010,JPO&INPIT
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