TARGET SIGNAL ENHANCEMENT DEVICE, AND METHOD AND PROGRAM THEREFOR

摘要

PROBLEM TO BE SOLVED: To suppress long time reverberation by improving control efficiency of a reverberation suppression filter of a target signal enhancement device. SOLUTION: The target signal enhancement device includes: a main processor; a reverberation suppression filter part; a reverberation suppression filter control part; and a steering reverse covariance matrix calculation part. The reverberation suppression filter control part includes: an observation signal product time sequence calculation means for calculating a time sequence of a product of an observation signal; a steering reverse covariance time sequence creation means for creating a steering reverse covariance time sequence in which each element of a steering reverse covariance matrix is rearranged in order of time lapse, by inputting a steering reverse covariance matrix which is output by the steering reverse covariance matrix calculation part; a mutual correlation coefficient calculation means for calculating the time sequence of the product of the observation signal, and a mutual correlation coefficient of the steering reverse covariance time sequence using fast Fourier transform; and a rearrangement means for creating a modified correlation matrix and a modified correlation vector by rearranging the mutual correlation coefficient. COPYRIGHT: (C)2011,JPO&INPIT