Fundamental beat component detection methods and sampling device and waveform observation system of the signal to be measured using the same

摘要

In order to accurately detect the repetition frequency of the measured signal with the harmonic components each having a power such as the (fundamental wave component) of the spectrum obtained from the measurement signal sampled with a certain sampling frequency fs, the The determined frequency fb of the peak signal of a plurality appearing in the band below half the frequency fs a [i], before and after changing the sampling frequency, and due to the fundamental wave of the signal to be measured, each peak signal of the plurality of The sequentially calculated [i, j] and the theoretical frequency fc beat component assuming beat component which is the (fundamental beat component), due to the harmonic components of the measured signal (harmonic beat component), theoretical frequency fc to compare sequential frequency fb of the peak signal and the plurality of [i] [i, j] the respective theoretical frequency fc, the best matching frequency fb of the peak signal and the plurality of [i] [k, j] The fundamental frequency beat component detection method has to be determined to be a fundamental beat component caused by the fundamental wave of the measured signal, the peak signal giving.