Patents by Inventor Yoko FUJISHIMA

Yoko FUJISHIMA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Dereverberation device and hearing aid
    Patent number: 10482894
    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.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: November 19, 2019
    Assignee: RION Co., Ltd.
    Inventors: Masatoshi Osawa, Masahiro Sunohara, Yoichi Fujisaka, Yoko Fujishima
  • DEREVERBERATION DEVICE AND HEARING AID
    Publication number: 20190267021
    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.
    Type: Application
    Filed: February 19, 2019
    Publication date: August 29, 2019
    Inventors: Masatoshi OSAWA, Masahiro SUNOHARA, Yoichi FUJISAKA, Yoko FUJISHIMA