| 摘要 |
A fundamental wave beat component frequency detecting method includes steps of obtaining the frequency fb[i] of plural peak signals which appear in a band ½ of a frequency fs from a spectrum obtained from measuring target signals sampled with the sampling frequency fs in order to detect the repetition frequency (fundamental wave component) of the measuring target signal having plural harmonic components having a similar power, assuming that each of the plural peak signals is a beat component (fundamental wave beat component) originating from the fundamental wave of the measuring target signal before and after the sampling frequency is changed so as to successively calculate each theoretical frequency fc[i,j] of the beat component (harmonic beat component) originating from the harmonic component of the measuring target signal, successively comparing the each theoretical frequency fc[i,j] with the frequency fb[i] of the plural peak signals, and determining that the peak signal which gives the theoretical frequency fc[k,j] which mostly agrees with the frequency fb[i] of the plural peak signals is a fundamental wave beat component originating from the fundamental wave of the measuring target signal.
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