| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a measurement method and a measurement device of frequency change, having improved frequency measurement resolution, without using a complicated circuit. Ž<P>SOLUTION: This frequency measuring device includes: a short gate time counter section that continuously measures a supplied pulse stream signal, in a short gate time, and outputs a series of count values that behave like a pulse stream corresponding to a frequency of the pulse stream signal; and a low-pass filter that removes high-frequency components from the series of counted values to obtain a level signal which corresponds to the frequency of the supplied pulse stream signal. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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