Patents by Inventor Eiji MISAWA

Eiji MISAWA 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).

  • Echo canceller device
    Patent number: 10068585
    Abstract: An echo canceller device is provided with a first filter unit that generates a first output signal y1(k) by filtering a first input signal x1(k) with a filter coefficient h(k), an adaptation unit that modifies the filter coefficient h(k) on the basis of an adaptation algorithm so that a first error signal e1(k) becomes small, a first delaying unit that delays a first objective signal d1(k) by a certain time period ? and outputs the signal as a second objective signal d2(k), a second delaying unit that delays the first input signal x1(k) by the certain time period ? and outputs the signal as a second input signal x2(k), and a second filter unit that generates a second output signal y2(k) by filtering the second input signal x2(k) by the filter coefficient h(k) modified by the adaptation unit.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: September 4, 2018
    Assignee: AMENITY RESEARCH INSTITUTE CO., LTD.
    Inventors: Eiji Misawa, Toshio Yagi, Yasumasa Shibata, Hiroyuki Toyozumi, Kiyotsugu Arai, Katsuaki Satoh
  • ECHO CANCELLER DEVICE
    Publication number: 20170178663
    Abstract: An echo canceller device is provided with a first filter unit that generates a first output signal y1(k) by filtering a first input signal x1(k) with a filter coefficient h(k), an adaptation unit that modifies the filter coefficient h(k) on the basis of an adaptation algorithm so that a first error signal e1(k) becomes small, a first delaying unit that delays a first objective signal d1(k) by a certain time period ? and outputs the signal as a second objective signal d2(k), a second delaying unit that delays the first input signal x1(k) by the certain time period ? and outputs the signal as a second input signal x2(k), and a second filter unit that generates a second output signal y2(k) by filtering the second input signal x2(k) by the filter coefficient h(k) modified by the adaptation unit.
    Type: Application
    Filed: July 24, 2015
    Publication date: June 22, 2017
    Applicant: AMENITY RESEARCH INSTITUTE CO., LTD.
    Inventors: Eiji MISAWA, Toshio YAGI, Yasumasa SHIBATA, Hiroyuki TOYOZUMI, Kiyotsugu ARAI, Katsuaki SATOH