| 摘要 |
PROBLEM TO BE SOLVED: To reduce pattern noises in a frequency-measuring apparatus that uses a short-gate time count method. SOLUTION: The frequency-measuring apparatus includes a signal source (10) for generating signals to be measured; a short-gate time counter section (20) for continuously counting the signals to be measured at a sampling frequency of a short gate time and outputting a series of count values corresponding to a frequency of the signals to be measured; and a low-pass filter (30) for removing high-frequency components from the series of count values. the combination of the frequency of the signals to be measured and the sampling frequency is defined by an operating point parameter, having a value ranging 0-1 among a ratio a/b between the frequency (a) of the signals to be measured and the sampling frequency (b), and the frequency of the signals to be measured and the sampling frequency are selected by an adjustor (50), in such a way that the value of the operating point parameter should not assume a value (noise peak value) close to a prescribed rational number. COPYRIGHT: (C)2010,JPO&INPIT
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