Patents by Inventor Mitsuhiro Takashima

Mitsuhiro Takashima 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).

  • Patent number: 10560133
    Abstract: To provide a device for radio communication using a plurality of antennas, in which: an amplitude/phase adjuster (1) and an amplitude/phase controller (1) control the amplitude and the phase of signals input from at least two antennas such that a directivity, allowing a desired signal to be obtained; an amplitude/phase adjuster (2) and an amplitude/phase controller (2) control the amplitude and the phase of the signals input from the antennas such that an arrival direction of the desired signal becomes a null point and that a directivity, allowing a signal other than the desired signal to be obtained; a signal synthesizer (1) combines the signals; a signal synthesizer (2) combines the signals; and a desired signal generator removes a signal from the signal synthesizer (2) from a signal from the signal synthesizer (1).
    Type: Grant
    Filed: September 4, 2018
    Date of Patent: February 11, 2020
    Assignee: Hitachi Kokusai Electric Inc.
    Inventors: Koji Yotsumoto, Yoichi Kushioka, Mitsuhiro Takashima
  • Patent number: 10469110
    Abstract: In a noise canceller device, interference signal adjustment units adjust delay, phase and amplitude of a signal received by a sub antenna under different conditions to obtain adjustment signals, and subtract the adjustment signals from a signal received by a main antenna to obtain differential signals. An average power calculation unit calculates an average power for each of the differential signals. An optimal condition search unit determines the values of delay, phase and amplitude that result in the minimum average power, and sets the values in an optimal interference signal adjustment unit. The optimal interference signal adjustment unit adjusts the signal received by the sub antenna using optimal values for delay, phase and amplitude to obtain an optimal adjustment signal. A cancellation unit subtracts the optimal adjustment signal from the signal received by the main antenna to remove interference signals, and outputs a desired signal to a host device.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: November 5, 2019
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Yoichi Kushioka, Koji Yotsumoto, Mitsuhiro Takashima
  • Publication number: 20190319651
    Abstract: In a noise canceller device, interference signal adjustment units adjust delay, phase and amplitude of a signal received by a sub antenna under different conditions to obtain adjustment signals, and subtract the adjustment signals from a signal received by a main antenna to obtain differential signals. An average power calculation unit calculates an average power for each of the differential signals. An optimal condition search unit determines the values of delay, phase and amplitude that result in the minimum average power, and sets the values in an optimal interference signal adjustment unit. The optimal interference signal adjustment unit adjusts the signal received by the sub antenna using optimal values for delay, phase and amplitude to obtain an optimal adjustment signal. A cancellation unit subtracts the optimal adjustment signal from the signal received by the main antenna to remove interference signals, and outputs a desired signal to a host device.
    Type: Application
    Filed: August 24, 2017
    Publication date: October 17, 2019
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: YOICHI KUSHIOKA, KOJI YOTSUMOTO, MITSUHIRO TAKASHIMA
  • Publication number: 20180375539
    Abstract: To provide a device for radio communication using a plurality of antennas, in which: an amplitude/phase adjuster (1) and an amplitude/phase controller (1) control the amplitude and the phase of signals input from at least two antennas such that a directivity, allowing a desired signal to be obtained; an amplitude/phase adjuster (2) and an amplitude/phase controller (2) control the amplitude and the phase of the signals input from the antennas such that an arrival direction of the desired signal becomes a null point and that a directivity, allowing a signal other than the desired signal to be obtained; a signal synthesizer (1) combines the signals; a signal synthesizer (2) combines the signals; and a desired signal generator removes a signal from the signal synthesizer (2) from a signal from the signal synthesizer (1).
    Type: Application
    Filed: September 4, 2018
    Publication date: December 27, 2018
    Inventors: Koji YOTSUMOTO, Yoichi KUSHIOKA, Mitsuhiro TAKASHIMA
  • Patent number: 10079614
    Abstract: In a noise canceler, interference signals received by sub-antennas 12 are cross-correlated by a first correlation-value calculation unit and the peaks of the interference signals are detected by a first peak detector. Interference signal information is acquired by a first-interference-signal information acquisition unit and the interference signals are synthesized by an interference signal synthesizer. A signal received by a main antenna and the synthesized interference signal are correlated by a second correlation-value calculation unit and the peak of the synthesized interference signal is detected by a second peak detector. The interference signal information is acquired by a second interference-signal-information acquisition unit and an interference signal replica is generated by an interference signal replica generator. The interference signal replica is subtracted by an interference signal removal unit from the signal received by the main antenna.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: September 18, 2018
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Yoichi Kushioka, Mitsuhiro Takashima
  • Publication number: 20180145709
    Abstract: In a noise canceler, interference signals received by sub-antennas 12 are cross-correlated by a first correlation-value calculation unit and the peaks of the interference signals are detected by a first peak detector. Interference signal information is acquired by a first-interference-signal information acquisition unit and the interference signals are synthesized by an interference signal synthesizer. A signal received by a main antenna and the synthesized interference signal are correlated by a second correlation-value calculation unit and the peak of the synthesized interference signal is detected by a second peak detector. The interference signal information is acquired by a second interference-signal-information acquisition unit and an interference signal replica is generated by an interference signal replica generator. The interference signal replica is subtracted by an interference signal removal unit from the signal received by the main antenna.
    Type: Application
    Filed: April 25, 2016
    Publication date: May 24, 2018
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Yoichi KUSHIOKA, Mitsuhiro TAKASHIMA
  • Patent number: 9871542
    Abstract: A noise canceller device for removing interference signals from other systems and improving communication quality of a desired signal is provided. The noise canceller device comprises a first calculation unit performing cross-correlation processing on interference signals received by sub-antennas, a first peak detection unit detecting peaks of the interference signals, a first information acquisition unit acquiring first interference signal information, a composition unit composing the interference signals, a second calculation unit performing correlation processing between a signal received by a main antenna and the composed interference signal, a second peak detection unit detecting a peak of the composed interference signal, a second information acquisition unit acquiring second interference signal information, an interference signal replica generation unit generating an interference signal replica, and a removal unit subtracting the interference signal replica from the received signal by the main-antenna.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: January 16, 2018
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Yoichi Kushioka, Koji Yotsumoto, Mitsuhiro Takashima
  • Publication number: 20160373145
    Abstract: A noise canceller device for removing interference signals from other systems and improving communication quality of a desired signal is provided. The noise canceller device comprises a first calculation unit performing cross-correlation processing on interference signals received by sub-antennas, a first peak detection unit detecting peaks of the interference signals, a first information acquisition unit acquiring first interference signal information, a composition unit composing the interference signals, a second calculation unit performing correlation processing between a signal received by a main antenna and the composed interference signal, a second peak detection unit detecting a peak of the composed interference signal, a second information acquisition unit acquiring second interference signal information, an interference signal replica generation unit generating an interference signal replica, and a removal unit subtracting the interference signal replica from the received signal by the main-antenna.
    Type: Application
    Filed: September 1, 2016
    Publication date: December 22, 2016
    Inventors: Yoichi KUSHIOKA, Koji YOTSUMOTO, Mitsuhiro TAKASHIMA
  • Patent number: 8208432
    Abstract: Communication equipment allocates a communication resource region which is used for communication with equipment of a communicating party and performs scheduling of resources. A data classification unit classifies data into small-volume RTD, large-volume RTD or nRTD. Based on the result of the classification, a scheduling unit allocates a communication resource region under a first condition that the RTD has priority over the nRTD, a second condition that the small-volume RTD has priority over the large-volume RTD, a third condition that a previously used communication resource region is, if possible, allocated to the small-volume RTD, and a fourth condition that the large-volume RTD and nRTD are allocated with priority given to equipment of a communicating party for which high communication quality is ensured. A communication unit performs communication with the equipment of the communicating party according to the result of the scheduling.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: June 26, 2012
    Assignee: Hitachi Kokusai Electric Inc.
    Inventor: Mitsuhiro Takashima
  • Patent number: 7953046
    Abstract: A wireless communications device wirelessly communicates with a communication partner by allocating communication resource areas thereto on a communication resource area basis.
    Type: Grant
    Filed: September 9, 2008
    Date of Patent: May 31, 2011
    Assignee: Hitachi Kokusai Electric Inc.
    Inventor: Mitsuhiro Takashima
  • Publication number: 20090213793
    Abstract: A media access control unit of a radio base station apparatus includes: a resource table for storing resource block numbers in order to reserve resource blocks for the packet data; a system information memory unit for storing a parameter used to determine whether to update information stored in the resource table; and a scheduler. When the parameter indicates update, the scheduler selects resource blocks spaced apart from each other in frequency and having a good radio quality, updates the resource table by using resource block numbers corresponding to the selected resource blocks, and performs persistent scheduling and distributed transmission scheduling on the packet data by using the resource blocks corresponding to the resource block numbers stored in the resource table.
    Type: Application
    Filed: February 13, 2009
    Publication date: August 27, 2009
    Applicant: Hitachi Kokusai Electric Inc.
    Inventor: Mitsuhiro Takashima
  • Publication number: 20090080379
    Abstract: Communication equipment that allocates a communication resource region which is used for communication with equipment of a communicating party performs scheduling satisfactorily. A data classification unit classifies data, which is an object of communication in communication with equipment of a communicating party, into small-volume RTD, large-volume RTD, or nRTD. Based on the result of the classification, a scheduling unit allocates a communication resource region under a first condition that the RTD should have priority over the nRTD, a second condition that the small-volume RTD should have priority over the large-volume RTD, a third condition that a previously used communication resource region should be, if possible, allocated to the small-volume RTD, and a fourth condition that the large-volume RTD and nRTD should be allocated with priority given to equipment of a communicating party for which high communication quality is ensured.
    Type: Application
    Filed: September 4, 2008
    Publication date: March 26, 2009
    Inventor: Mitsuhiro Takashima
  • Publication number: 20090080341
    Abstract: A wireless communications device wirelessly communicates with a communication partner by allocating communication resource areas thereto on a communication resource area basis.
    Type: Application
    Filed: September 9, 2008
    Publication date: March 26, 2009
    Applicant: Hitachi Kokusai Electric Inc.
    Inventor: Mitsuhiro Takashima
  • Patent number: 6012905
    Abstract: A piston-type fluid displacement apparatus includes a housing enclosing a crank chamber, a suction chamber, and a discharge chamber. Discharge conduits are formed at a top dead center position of the piston. A control device includes valve members having suction apertures and discharge apertures for opening and closing the suction conduits and the discharge conduits. The control device further includes a driving mechanism joined to the valve members for driving the valve members to gradually open each of the suction conduits during the suction stage of the piston and to gradually close each of the discharge conduits during the discharge stage of the piston. Thus, the piston-type fluid displacement apparatus may prevent the valve assembly from stopping or sticking at the sliding contact surfaces of the suction and discharge holes to allow the pistons to reciprocate smoothly within each cylinder without reducing the compression efficiency.
    Type: Grant
    Filed: February 25, 1998
    Date of Patent: January 11, 2000
    Assignee: Sanden Corporation
    Inventors: Mitsuhiro Takashima, Yujiro Morita
  • Patent number: D447150
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: August 28, 2001
    Assignee: Sanden Corporation
    Inventors: Kiyoshi Miyazawa, Hiroshi Kanou, Mitsuhiro Takashima, Yuujirou Morita
  • Patent number: D450060
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: November 6, 2001
    Assignee: Sanden Corporation
    Inventors: Kiyoshi Miyazawa, Hiroshi Kanou, Mitsuhiro Takashima, Yuujirou Morita
  • Patent number: D452252
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: December 18, 2001
    Assignee: Sanden Corporation
    Inventors: Kiyoshi Miyazawa, Mitsuhiro Takashima