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).
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Patent number: 10560133Abstract: 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: GrantFiled: September 4, 2018Date of Patent: February 11, 2020Assignee: Hitachi Kokusai Electric Inc.Inventors: Koji Yotsumoto, Yoichi Kushioka, Mitsuhiro Takashima
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Patent number: 10469110Abstract: 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: GrantFiled: August 24, 2017Date of Patent: November 5, 2019Assignee: HITACHI KOKUSAI ELECTRIC INC.Inventors: Yoichi Kushioka, Koji Yotsumoto, Mitsuhiro Takashima
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Publication number: 20190319651Abstract: 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: ApplicationFiled: August 24, 2017Publication date: October 17, 2019Applicant: HITACHI KOKUSAI ELECTRIC INC.Inventors: YOICHI KUSHIOKA, KOJI YOTSUMOTO, MITSUHIRO TAKASHIMA
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Publication number: 20180375539Abstract: 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: ApplicationFiled: September 4, 2018Publication date: December 27, 2018Inventors: Koji YOTSUMOTO, Yoichi KUSHIOKA, Mitsuhiro TAKASHIMA
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Patent number: 10079614Abstract: 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: GrantFiled: April 25, 2016Date of Patent: September 18, 2018Assignee: HITACHI KOKUSAI ELECTRIC INC.Inventors: Yoichi Kushioka, Mitsuhiro Takashima
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Publication number: 20180145709Abstract: 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: ApplicationFiled: April 25, 2016Publication date: May 24, 2018Applicant: HITACHI KOKUSAI ELECTRIC INC.Inventors: Yoichi KUSHIOKA, Mitsuhiro TAKASHIMA
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Patent number: 9871542Abstract: 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: GrantFiled: September 1, 2016Date of Patent: January 16, 2018Assignee: HITACHI KOKUSAI ELECTRIC INC.Inventors: Yoichi Kushioka, Koji Yotsumoto, Mitsuhiro Takashima
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Publication number: 20160373145Abstract: 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: ApplicationFiled: September 1, 2016Publication date: December 22, 2016Inventors: Yoichi KUSHIOKA, Koji YOTSUMOTO, Mitsuhiro TAKASHIMA
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Patent number: 8208432Abstract: 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: GrantFiled: September 4, 2008Date of Patent: June 26, 2012Assignee: Hitachi Kokusai Electric Inc.Inventor: Mitsuhiro Takashima
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Patent number: 7953046Abstract: A wireless communications device wirelessly communicates with a communication partner by allocating communication resource areas thereto on a communication resource area basis.Type: GrantFiled: September 9, 2008Date of Patent: May 31, 2011Assignee: Hitachi Kokusai Electric Inc.Inventor: Mitsuhiro Takashima
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Publication number: 20090213793Abstract: 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: ApplicationFiled: February 13, 2009Publication date: August 27, 2009Applicant: Hitachi Kokusai Electric Inc.Inventor: Mitsuhiro Takashima
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Publication number: 20090080379Abstract: 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: ApplicationFiled: September 4, 2008Publication date: March 26, 2009Inventor: Mitsuhiro Takashima
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Publication number: 20090080341Abstract: A wireless communications device wirelessly communicates with a communication partner by allocating communication resource areas thereto on a communication resource area basis.Type: ApplicationFiled: September 9, 2008Publication date: March 26, 2009Applicant: Hitachi Kokusai Electric Inc.Inventor: Mitsuhiro Takashima
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Patent number: 6012905Abstract: 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: GrantFiled: February 25, 1998Date of Patent: January 11, 2000Assignee: Sanden CorporationInventors: Mitsuhiro Takashima, Yujiro Morita
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Patent number: D447150Type: GrantFiled: June 20, 2000Date of Patent: August 28, 2001Assignee: Sanden CorporationInventors: Kiyoshi Miyazawa, Hiroshi Kanou, Mitsuhiro Takashima, Yuujirou Morita
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Patent number: D450060Type: GrantFiled: June 20, 2000Date of Patent: November 6, 2001Assignee: Sanden CorporationInventors: Kiyoshi Miyazawa, Hiroshi Kanou, Mitsuhiro Takashima, Yuujirou Morita
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Patent number: D452252Type: GrantFiled: June 20, 2000Date of Patent: December 18, 2001Assignee: Sanden CorporationInventors: Kiyoshi Miyazawa, Mitsuhiro Takashima