Patents Assigned to Hitachi Kokusai Electric Inc.
  • Patent number: 10841027
    Abstract: A broadcast wave synchronization signal converting device that synchronizes broadcast waves with GNSS signals on a reception side and corrects the broadcast waves to global standard times by use of correction values, thereby performing periodic calibrations of frequencies. The broadcast wave synchronization signal converting device includes: a PLL circuit reproduces system clocks on the basis of time information acquired from received broadcast waves; a subtractor (C1) subtracts, from a counter value corresponding to the periodic signal intervals of GNSS signals, a counter value of the system clocks counted at the signal intervals and outputs the difference value; a control amount adjustor calculates a control amount of synchronization as a correction value on the basis of the difference value; and a subtractor (B) subtracts the correction value from the acquired time information and sets the corrected time information to a PCR counter as the internal time information thereof.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: November 17, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Koichi Yanagisawa, Satoru Yasui
  • Patent number: 10840874
    Abstract: A matching device includes a directional coupler, a matching circuit including a first variable capacitance capacitor and a second variable capacitance capacitor, and a control unit. The control unit calculates a reflection coefficient on the basis of a forward power and a reflected power that are detected by the directional coupler, changes the capacitance value of the first variable capacitance capacitor and the capacitance value of the second variable capacitance capacitor such that the calculated reflection coefficient becomes smaller, and makes the cycle of calculation of the set values of the capacitance value of the first variable capacitance capacitor and the capacitance value of the second variable capacitance capacitor shorter than the cycle of acquisition of the capacitance value of the first variable capacitance capacitor and the capacitance value of the second variable capacitance capacitor.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: November 17, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Yoshiyuki Oshida, Naoya Fujimoto, Norikazu Kato
  • Patent number: 10817709
    Abstract: A similar image search system is provided and searches for images similar to a search key image, where a number of searched images of person are classified into a number of groups based on a similarity between the respective images. A grouping display is performed in which at least one of the images that belongs to each group is displayed in a display region that is provided for each group. The grouping display is performed in such a manner that the order of the similarity between each group and the search key image can be visually recognized.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: October 27, 2020
    Assignee: Hitachi Kokusai Electric Inc.
    Inventors: Shinya Ogura, Yuichiro Komiya
  • Patent number: 10812036
    Abstract: A matching box comprises a directional coupler that detects forward waves and reflected waves; a matching circuit having a first variable capacitance capacitor, a second variable capacitance capacitor, and inductance; and a control unit that calculates a reflection coefficient on the basis of the forward waves and the reflected waves, and controls a capacitance value VC1 of the first variable capacitance capacitor and a capacitance value VC2 of the second variable capacitance capacitor, wherein the control unit changes VC2 if the distance between a matching circle drawn by the trajectory of the reflection coefficient passing through a matching point on a Smith chart, and the calculated reflection coefficient is greater than a prescribed value, and changes VC1 if such distance is set to be no greater than the prescribed value and when the value of such distance becomes no greater than the prescribed value, thereby reducing the reflection coefficient.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: October 20, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Naoya Fujimoto, Norikazu Kato, Yoshiyuki Oshida
  • Patent number: 10796413
    Abstract: In a video monitoring system including HD and SD cameras, the system includes, on the transmitting side, a division/rotation processing unit for dividing an SD image into multiple divided images horizontally and performing a process for rotating the divided images by 90 degrees to the left, an image insertion unit for arranging and superimposing the divided images in a text telop region of an HD image, and a HD encoder for compressing and transmitting the HD image with the SD image superimposed. The system further includes, on the receiving side, a HD decoder for expanding the received HD image, and an output image processing unit for extracting the multiple divided images of the SD image and rotating these images by 90 degrees to the right, sorting and combining these images to reproduce the SD image, and outputting the expanded output HD image and the reproduced output SD image.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: October 6, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Tadamichi Kudo
  • Patent number: 10789989
    Abstract: A video recording apparatus includes a recording device having a location information area and a video data area. The location information area stores location information of video data stored in the video data area. The video data area stores the video data in units of blocks with a size of 1 MB or greater. The tail end of the block is used as a table of contents region for storing table of contents information of a plurality of the most-recent blocks. By providing the table of contents regions at a predetermined frequency, the tables of contents of all blocks being used in the video data area are retained in a distributed and redundant manner. Whenever the power supply is re-activated, the tables of contents regions are read, and pieces of the table of contents information are joined appropriately to construct a complete table of contents in memory.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: September 29, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Tomomi Takada, Shigeyuki Murata, Satoshi Kasai
  • Patent number: 10783365
    Abstract: An image processing device or a method of processing an image is disclosed. The method includes receiving an image, detecting a plurality of person images in the image, identifying at least a first person image from among the plurality of person images by a preferential method, identifying at least a second person image from among the plurality of person images excluding the first person image, by an exhaustive method, and extracting a first feature amount as to the first person image and a second feature amount as to the second person image during a time interval. For example, the total number of the first person images and the second person images is no more than a maximum number of person images, identified by performance corresponding to process the person images during the time interval.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: September 22, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Shinya Ogura, Ryosuke Kimura, Seiichi Hirai, Satoshi Maruta, Sho Nishino
  • Patent number: 10742371
    Abstract: A wireless communication system includes a transmitter that discretely inserts null subcarriers into an OFDM-demodulated signal in time and frequency domains, and a receiver that receive signals by a first and second antennas. The receiver calculates a complex coefficient wherein a result of multiplying a first reception vector for each of the null subcarriers received by the first antenna by the complex coefficient is equal to an amplitude of a second reception vector of the corresponding null subcarrier received by the second antenna and is opposite in phase thereto, calculates a fourth reception vector by multiplying a third reception vector of any data subcarrier received by the first antenna by a coefficient that is obtained by interpolating the complex coefficient, and adds the fourth reception vector to a fifth reception vector of the any data subcarrier received by the second antenna.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: August 11, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Naoki Hongo
  • Patent number: 10691947
    Abstract: An image monitoring system includes: a reference image generation unit generating a reference image serving as a reference image, based on an input image; a foreground extraction unit detecting, from the input image, a foreground region different from the reference image; a stationary region extraction unit extracting a stationary region from the foreground region; a feature quantity extraction unit extracting a feature quantity of the stationary region; a feature quantity recording unit recording feature quantities as a function of time; a stationary object detection unit clustering pixels, recorded feature quantities of which meet predetermined criteria, and detecting a stationary object; a left object determination unit determining whether the stationary object is a left object, based on a feature quantity of the stationary object and evaluation of the surrounding environment; and a left object management unit managing attributes of left objects, and issuing a report when a certain condition is met.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: June 23, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Kazunari Iwanaga, Wataru Ito
  • Patent number: 10657365
    Abstract: This specific person detection system: identifies, from among the persons recorded in a specific person recording unit, a person who most closely matches a feature value extracted from image data; calculates the degree to which feature values of a plurality of persons extracted from other image data match the identified person; and outputs, as an identification result, information about a person who has a feature value closely matching the identified person, and who is associated with angle information that most closely matches angle information associated with the identified person.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: May 19, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Seiichi Hirai
  • Patent number: 10637525
    Abstract: There is provided a wireless device capable of supporting both of TDD and FDD wireless communications with a simple configuration. The wireless device includes a transmitter that transmits a signal of a first frequency; a DPD receiver that receives signals of the first frequency; a receiver that receives signals of a second frequency; a duplexer having a first filter having passband characteristics in the first frequency band and a second filter having passband characteristics in the second frequency band; and a circulator that splits the signal from the transmitter to output the split signals to the duplexer and the DPD receiver, and outputs a reception signal from the duplexer to the DPD receiver. The duplexer is connected to the circulator on the first filter side and to the receiver on the second filter side, and uses the DPD receiver for FDD and TDD transmission feedback and for TDD reception.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: April 28, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Terufumi Nagano, Hideaki Shimizu
  • Patent number: 10630774
    Abstract: It is assumed that some railway vehicles each include a control device and other railway vehicles include no control devices and that one or more control devices may be included in a train information. If only one control device is included in the train formation, there is no problem. However, if two or more control devices are included therein, it means that multiple control systems exist therein, so that it is necessary to determine a control system consistently. When a train is activated and started for operations or when railway vehicles are coupled together or divided, a management server, which has the smallest IP address value assigned, for example, by a DHCP and which exhibits the highest processing speed, controls, as a main management server, all of such systems. Even if any trouble occurs in a network or in a network device, the management system is automatically reconstituted.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: April 21, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Takashi Takeda, Kiyoshi Iyori, Tetsuya Ito
  • Patent number: 10618529
    Abstract: The vehicle monitoring system includes a plurality of cameras provided corresponding to a plurality of doors provided on both sides (A side and B side) of each vehicle, and a management device for determining a camera corresponding to an open door. The management device determines a camera whose initial position is on the B side as the display use camera to be used for display, with respect to a vehicle in which the initial position of the door open camera corresponding to the open door identified by the open door identification information, and the door opening-side information match with the B side. With respect to a vehicle in which the initial position of the door open camera and the door opening-side information do not match with the B side, the management device determines a camera whose initial position is on the A side as the display use camera.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: April 14, 2020
    Assignee: Hitachi Kokusai Electric Inc.
    Inventor: Satoshi Maruta
  • Patent number: 10594933
    Abstract: A monitoring system includes an imaging device, a recording device and a monitoring device. The imaging device is configured to image a monitoring target. The recording device is configured to stores image data captured by the imaging device. The monitoring device is configured to generate a composite image data by combining the image data captured by the imaging device and an image data, having the same view angle as that of the captured image data, read out from the recording device and to generate an edge cutout rectangle image data by connecting luminance change points exceeding a predetermined threshold value, starting from a predetermined point in the composite image data.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: March 17, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Kazuhiro Toda
  • Patent number: 10587330
    Abstract: A reception device including reception antennas is provided. In the reception device, a demodulation unit is configured to calculate, for each of a plurality of antenna combinations of the reception antennas, log likelihood ratios of coded bits of error correction code obtained from reception signals of the reception antennas. A mutual information amount calculation unit is configured to calculate an average mutual information amount based on the log likelihood ratios corresponding to each of the antenna combinations. An antenna combination selection unit is configured to output determination information for specifying one of the antenna combinations for which the average mutual information amount is the maximum. A signal selection unit is configured to select the log likelihood ratios corresponding to the specified antenna combination based on the determination information, and a decoding unit is configured to decodes the selected log likelihood ratios.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: March 10, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Daiki Hoshi, Tatsuhiro Nakada, Kei Ito, Hiroki Kato
  • Patent number: 10587823
    Abstract: A video switching device includes a video switching unit that has at least two video signal input units, and an encoding device. The video switching unit includes a first control detection unit that, on the basis of an externally inputted control signal, outputs a pre-control signal; a second control detection signal that, on the basis of the control signal, outputs a camera switching instruction signal for switching camera video signals during a vertical blanking interval; and a camera video switching unit that switches two video signals. The encoding device includes an encoding unit that encodes video signals; and a control unit that, by means of the pre-control signal, reduces the amount of code generated by the encoding unit.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: March 10, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Atsushi Miyashita, Hiroyuki Takesue
  • Patent number: 10587364
    Abstract: A wireless communication system and device improve throughput in a propagation path environment where retransmission is repeated. In a transmission-side wireless communication device, transmission signal storage memories hold bit sequences related to two packet signals for which NACK has been returned, a helper packet generation unit operates the exclusive OR of bit sequences related to two or more of a predetermined number of packet signals held in the transmission signal storage memories, and a coding unit to a transmitting and receiving antenna transmits an auxiliary packet generated by coding a bit sequence of a helper packet that is a result of the exclusive OR operation when the number of packet signals for which NACK has been returned reaches the predetermined number.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: March 10, 2020
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Tadashi Matsumoto, Ade Irawan
  • 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
  • Publication number: 20200036432
    Abstract: A reception device including reception antennas is provided. In the reception device, a demodulation unit is configured to calculate, for each of a plurality of antenna combinations of the reception antennas, log likelihood ratios of coded bits of error correction code obtained from reception signals of the reception antennas. A mutual information amount calculation unit is configured to calculate an average mutual information amount based on the log likelihood ratios corresponding to each of the antenna combinations. An antenna combination selection unit is configured to output determination information for specifying one of the antenna combinations for which the average mutual information amount is the maximum. A signal selection unit is configured to select the log likelihood ratios corresponding to the specified antenna combination based on the determination information, and a decoding unit is configured to decodes the selected log likelihood ratios.
    Type: Application
    Filed: February 21, 2018
    Publication date: January 30, 2020
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: DAIKI HOSHI, TATSUHIRO NAKADA, KEI ITO, HIROKI KATO
  • Publication number: 20200023790
    Abstract: Proposed is technology that enables the linked use of a camera and sensor system in a train image monitoring system. A train image monitoring system is characterized by, in a train monitoring system (100), the following: a control device (271) comprising a means for managing the device configuration of the system, a means for receiving data from each device, a means for determining the control contents of each device, and a means for transmitting a control instruction to each device; a recording device comprising a means for receiving data from each device, a means for recording received data, a means for reading out recorded data, a means for transmitting read-out data, and a means for receiving a control instruction; and a display device comprising a means for receiving data from the recording device, a means for displaying received data on a screen, a means for detecting a user operation, a means for transmitting the contents of a user operation, and a means for receiving a control instruction.
    Type: Application
    Filed: March 27, 2017
    Publication date: January 23, 2020
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Seiichi HIRAI