Patents by Inventor Mitsuru Kaitou

Mitsuru Kaitou 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).

  • Active noise reduction device, instrument using same, and active noise reduction method
    Patent number: 9646596
    Abstract: In an active noise reduction device, in order to solve this problem, a control block determines a level of a reference signal detected by a level detection unit. If determining that the level of the reference signal is small, the control block decreases a level of a cancel signal. This operation suppresses generation of an abnormal sound even if a level of a noise is small.
    Type: Grant
    Filed: January 21, 2014
    Date of Patent: May 9, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Mitsuhiro Tani, Mitsuru Kaitou, Toshiyuki Funayama
  • Active noise reduction device and active noise reduction method
    Patent number: 9596540
    Abstract: An active noise reduction device is used with a secondary noise source that generates a secondary noise and an error signal source that outputs an error signal corresponding to a residual sound caused by interference between the secondary noise and a noise. A ?-adjustment unit calculates a step-size parameter for updating a filter coefficient of an adaptive filter by multiplying a standard step-size parameter by a ratio of a standard representative input value corresponding to amplitude of a signal to a representative input value corresponding to the amplitude of the signal.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: March 14, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Mitsuhiro Tani, Toshiyuki Funayama, Mitsuru Kaitou
  • ACTIVE NOISE REDUCTION DEVICE, INSTRUMENT USING SAME, AND ACTIVE NOISE REDUCTION METHOD
    Publication number: 20150356965
    Abstract: In an active noise reduction device, in order to solve this problem, a control block determines a level of a reference signal detected by a level detection unit. If determining that the level of the reference signal is small, the control block decreases a level of a cancel signal. This operation suppresses generation of an abnormal sound even if a level of a noise is small.
    Type: Application
    Filed: January 21, 2014
    Publication date: December 10, 2015
    Inventors: MITSUHIRO TANI, MITSURU KAITOU, TOSHIYUKI FUNAYAMA
  • ACTIVE NOISE REDUCTION DEVICE AND ACTIVE NOISE REDUCTION METHOD
    Publication number: 20150063581
    Abstract: An active noise reduction device is used with a secondary noise source that generates a secondary noise and an error signal source that outputs an error signal corresponding to a residual sound caused by interference between the secondary noise and a noise. A ?-adjustment unit calculates a step-size parameter for updating a filter coefficient of an adaptive filter by multiplying a standard step-size parameter by a ratio of a standard representative input value corresponding to amplitude of a signal to a representative input value corresponding to the amplitude of the signal.
    Type: Application
    Filed: June 25, 2013
    Publication date: March 5, 2015
    Inventors: Mitsuhiro Tani, Toshiyuki Funayama, Mitsuru Kaitou