Signal processing device, method, program, and recording medium

PROBLEM TO BE SOLVED: To provide a signal processing device to presume the quasi-period signal parameter while securing the estimated accuracy of the low frequency components of the model parameter of the time-series signal whose fundamental frequency of the observed signal is low. SOLUTION: The frequency component output section 10 outputs the observation time frequency components by wavelet transforming the time-series signal, and the initial parameter generator 20 sets up the operation initial value and the error distribution weighting constants. The auxiliary variable updating section 30 updates the auxiliary variable which distributes the observation time frequency components to each frequency component of the quasi-frequency signal model. The frequency aggregate updating section 40 outputs the frequency aggregate of all the frequency values in which the harmonic frequency component complex amplitude parameter of each quasi-frequency signal model and the distributed components of the observation time frequency components are making an acute angle on a complex plane. The quasi-frequency signal model parameter is updated by the quasi-frequency signal model parameter updating section 50 and outputted by the quasi-frequency signal model parameter output 70, if judged to satisfy the convergence decision conditions by the convergence decision section 60. COPYRIGHT: (C)2010,JPO&INPIT