Patent ID: 8195416
Filing Date: 2012-06-05
Classification: G01R

Abstract:
1. A fundamental wave beat component detecting method comprising: a first stage of analyzing a signal obtained by a sampling apparatus which samples a measuring target signal P with a sampling frequency fs so as to obtain a spectrum of the signal; a second stage of detecting plural peak signals which appear in a band ½ of the sampling frequency fs from the spectrum obtained in the first stage and obtaining each frequency fb[i] of the plural peak signals, wherein i is an integer; a third stage of successively assuming that each of the plural peak signals detected in the second stage is a fundamental wave beat component originating from a fundamental wave of the measuring target signal P and calculating each theoretical frequency fc[i,j] of a harmonic beat component originating from a harmonic component of the measuring target signal P, wherein i is an integer and j is an integer; and a fourth stage of comparing each theoretical frequency fc[i,j] of the harmonic beat component calculated successively for each of the plural peak signals in the third stage with said each frequency fb[i] of the plural peak signals detected in the second stage and based on a result of the comparison, determining one of the plural peak signals whose each theoretical frequency fc[k,j] of the harmonic beat component most closely matches with said each frequency fb[i] of the plural peak signals, as an actual fundamental wave beat component, wherein k is an integer.