SIGNAL ANALYSIS METHOD, SIGNAL ANALYSIS DEVICE, AND SIGNAL ANALYSIS PROGRAM

摘要

Provided is a signal analysis device that has a high frequency resolution not depending on an analysis window length and can analyze a frequency with considerably high accuracy. When the signal analysis device inputs therein an analysis object signal to be analyzed, the device obtains a frequency f ', amplitude A ' and an initial phase Õ' such that the sum of squares of a difference between the analysis object signal and a sinusoidal model signal expressed by a phase using the frequency f ' and the initial phase Õ' and by the amplitude A' is a minimum value.