Sound source separation system which converges a separation matrix using a dynamic update amount based on a cost function

Abstract

A system capable of separating sound source signals with high precision while improving a convergence rate and convergence precision. A process of updating a current separation matrix Wto a next separation matrix Wsuch that a next value J(W) of a cost function is closer to a minimum value J(W) than a current value J(W) is iteratively performed. An update amount ΔWof the separation matrix is increased as the current value J(W) of the cost function is increased and is decreased as a current gradient ∂J(Wk)/∂W of the cost function is rapid. On the basis of input signals x from a plurality of microphones Mand an optimal separation matrix W, it is possible to separate sound source signals y(=W·x) with high precision while improving a convergence rate and convergence precision.