公开(公告)号：US10482894B2

公开(公告)日：2019-11-19

申请号：US16279486

申请日：2019-02-19

Applicant: RION Co., Ltd.

Inventor： Masatoshi Osawa ,  Masahiro Sunohara ,  Yoichi Fujisaka ,  Yoko Fujishima

IPC: G10L21/0208 ,  G10K15/08 ,  H04R25/00 ,  G10L21/0324

Abstract: A dereverberation device includes an input instantaneous value calculation unit configured to calculate an input instantaneous value based on an input signal; a reverberation estimation unit configured to calculate a moving average of the input instantaneous value as a reverberation component; a gain calculation unit configured to calculate, with the input instantaneous value and the reverberation component, a first gain as a basic gain for the input signal; a gain suppression control unit configured to calculate, according to a ratio between the input instantaneous value and the reverberation component, a second gain changing within a range between a predetermined lower limit and a predetermined upper limit, thereby outputting a larger one of the first gain or the second gain as a third gain; and a gain processing unit configured to multiply the input signal by the third gain.