Dereverberation system and dereverberation method

A dereverberation system which includes an electronic control unit, the electronic control unit comprising:

• a first arithmetic processing element configured to set an inverse filter;
• and
• a second arithmetic processing element configured to generate output signals by passing input signals obtained from an N (N=1, 2 . . . ) number of microphones through the inverse filter set by the first arithmetic processing element;
• the first arithmetic processing element calculates a pseudo-inverse matrix for a non-square matrix of N×L rows by N×Nh columns wherein, L=Ng+Nh−1;
• Ng denotes a response length of a transfer system of source signals from a sound source to the microphone, and Nh denotes a filter length of the inverse filter, as a correlation matrix of the input signals, and sets the inverse filter on the basis of the pseudo-inverse matrix and a desired correlation value between the input signals and the output signals which satisfy a condition that reverberation components of the input signals are not included in the output signals.