Patents by Inventor Ryo Igarashi
Ryo Igarashi 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: 12047710Abstract: A remote operator that remotely assists in traveling the autonomous traveling vehicle refer to a remote monitoring terminal. A remote monitoring device acquires data of a plurality of sensors mounted on the autonomous traveling vehicle, executes an image generation processing for generating an around-view of the vehicle by processing the data, calculates the lane width of the lane traveled by the vehicle based on the map information, calculates the vehicle width ratio of the vehicle with respect to the lane width, and when the vehicle width ratio is greater than a predetermined determination threshold, provides the generated around-view by the image generation processing to the remote monitoring terminal.Type: GrantFiled: April 29, 2022Date of Patent: July 23, 2024Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Ryo Igarashi
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Publication number: 20240230832Abstract: One aspect of the present invention is a decision device including: a position information acquisition unit that acquires position information indicating a position where the lighting device is installable and an irradiation target region that is irradiated with light in a case where the lighting device is installed at the position; an adjacency information acquisition unit that acquires adjacency information indicating an adjacency relationship of the irradiation target region on the basis of the position information acquired by the position information acquisition unit; and a decision unit that decides the installation position of the lighting device on the basis of the adjacency information acquired by the adjacency information acquisition unit such that non-irradiation target regions are not adjacent to each other, the non-irradiation target regions being not irradiated with light whose output mode changes due to non-installation of the lighting devices.Type: ApplicationFiled: May 20, 2021Publication date: July 11, 2024Inventors: Naotaka SHIBATA, Takeshi Imai, Ryo IGARASHI, Kazutaka HARA
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Patent number: 12021567Abstract: An optical reception apparatus includes an optical coherent reception unit that generates an I-axis component of a reception signal and a Q-axis component of the reception signal based on an optical signal subjected to continuous phase frequency shift keying, a conversion unit that generates a digital signal of the I-axis component of the reception signal and a digital signal of the Q-axis component of the reception signal, a differential detection unit that generates a differential detection signal, a frequency offset compensation unit that derives a phase change amount or a temporal change in the Q-axis component of the differential detection signal whose component of a frequency offset has been compensated, a clock error detection unit that detects an amount of shift of a sampling phase of the differential detection signal whose component of the frequency offset has been compensated, based on the phase change amount or the temporal change in the Q-axis component of the differential detection signal, and aType: GrantFiled: May 27, 2020Date of Patent: June 25, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventor: Ryo Igarashi
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Publication number: 20240201316Abstract: A mobile terminal according to the present invention is configured to: acquire position information from a lighting device which transmits the position information by a change in a light output mode; derive a first distance between a first coordinate and a terminal projection position, the first coordinate indicating a position obtained by projecting, on a projection plane parallel to a floor surface, a first lighting device from which first position information is acquired as the position information, and the terminal projection position being obtained by projecting the mobile terminal on the projection plane; derive a second distance between a second coordinate and the terminal projection position, the second coordinate indicating a position obtained by projecting, on the projection plane, a second lighting device from which second position information is acquired as the position information; acquire a rotation angle of rotation of the mobile terminal on the projection plane from acquisition of the first poType: ApplicationFiled: May 20, 2021Publication date: June 20, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takeshi IMAI, Naotaka SHIBATA, Kazutaka HARA, Ryo IGARASHI
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Publication number: 20240200950Abstract: An aspect of the present invention is a moving body that moves along a rail, the moving body including: a light emission unit; a movement control unit that controls the moving body so as to move on the rail at a predetermined speed; a measurement unit that measures a movement time of moving from a predetermined position on the rail; and a transmission unit that transmits a signal indicating position information corresponding to the movement time measured by the measurement unit by using the light emission unit.Type: ApplicationFiled: May 20, 2021Publication date: June 20, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kazutaka HARA, Ryo IGARASHI, Junichi KANI, Naotaka SHIBATA, Takeshi IMAI
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Patent number: 11933629Abstract: A map data updating device comprises a communication unit, a memory, and a processor configured to store map data, received from a server through the communication unit before the vehicle has begun to travel, in the memory as initial map data, and to send a request to the server through the communication unit for update information representing information updated from the initial map data for each of a plurality of road zones within the scheduled route, from among the information associated with the road zones in the map data updated at the server, and to use the update information received through the communication unit to update the initial map data, after the vehicle has begun to travel along the scheduled route.Type: GrantFiled: March 5, 2021Date of Patent: March 19, 2024Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Ryo Igarashi
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Publication number: 20240031035Abstract: A coherent optical reception device includes a coherent receiver that receives signal light in which an AMCC signal is superimposed on a main signal by phase modulation and outputs a reception signal and a digital signal processor, in which a modulation signal of the AMCC signal superimposed on the main signal is multiplied by a clock, the digital signal processor includes a symbol output, an AMCC signal code sequence demodulator, and a main signal code sequence demodulator, and the AMCC signal code sequence demodulator includes a main signal component remover that removes the main signal included in the reception signal output from the symbol output, and a clock component remover that removes a clock component included in the reception signal from which the main signal has been removed by the main signal component remover.Type: ApplicationFiled: September 23, 2020Publication date: January 25, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo IGARASHI, Masamichi FUJIWARA, Takuya KANAI
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Patent number: 11870497Abstract: An optical reception device including: a local light transmission unit configured to generate a plurality of local lights having different wavelengths, select a local light having a wavelength that is close to the wavelength of a received optical signal from among the plurality of generated local lights having different wavelengths, and transmit the selected local light to a coherent receiver; a demultiplexing unit configured to demultiplex a received optical signal and transmit the demultiplexed optical signal to the coherent receiver via a first path; and a wavelength detection unit configured to input the optical signal demultiplexed by the demultiplexing unit via a second path, split the input optical signal into different paths according to wavelengths by using a wavelength multiplexer/demultiplexer, and output, to the local light transmission unit, a control signal for causing the local light transmission unit to output a local light having a frequency that corresponds to a path in which the optical sigType: GrantFiled: July 1, 2019Date of Patent: January 9, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo Igarashi, Takuya Kanai, Masamichi Fujiwara, Junichi Kani
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Patent number: 11863211Abstract: An optical communication system configured with a station-side apparatus and a plurality of subscriber-side apparatuses in a bus network topology includes an optical amplification unit installed on a station side, and a drop unit configured to branch an optical signal and excitation light, wherein the optical amplification unit includes an amplifier configured to amplify a downlink signal, and an excitation light output unit configured to output the excitation light for amplifying an uplink signal to a communication path, and the drop unit changes a branching ratio in accordance with a wavelength of the optical signal so that a transmission loss of the excitation light with respect to a trunk fiber is reduced.Type: GrantFiled: March 4, 2020Date of Patent: January 2, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo Igarashi, Masamichi Fujiwara, Kazutaka Hara, Takuya Kanai, Yasutaka Kimura, Atsuko Kawakita
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Publication number: 20230403080Abstract: One aspect of the present invention is a receiving apparatus including a reception unit that receives signal light frequency-modulated by a signal obtained by adding a main signal and a control signal having a lower frequency than the main signal, and converts the signal light into an analog electric signal, and a processing unit that acquires a code sequence corresponding to the control signal on the basis of the analog electric signal, in which the processing unit includes a frequency offset amount acquisition unit that acquires a frequency offset amount of the signal light acquired on the basis of the analog electric signal, and a determination unit that determines the code sequence corresponding to the control signal on the basis of the frequency offset amount acquired by the frequency offset amount acquisition unit.Type: ApplicationFiled: November 25, 2020Publication date: December 14, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo IGARASHI, Ryo KOMA
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Patent number: 11828602Abstract: A location estimating device has a processor that is configured to calculate a first estimated location of a vehicle using positional information representing the location of a vehicle and first map data overlapping with a first section of a vehicle traveling route, to calculate a second estimated location of the vehicle using positional information and second map data that overlaps with a second section of the traveling route, the first section and the second section having an overlapping section, and to assess whether or not the precision of the second estimated location satisfies a predetermined assessment criterion when the vehicle is traveling in the overlapping section from the first section toward the second section.Type: GrantFiled: June 10, 2021Date of Patent: November 28, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Ryo Igarashi
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Patent number: 11818633Abstract: A map update system includes a data transmission device mounted on a vehicle and a map server which stores map data. The data transmission device generates sensor data representing a road environment of surroundings of the vehicle in a predetermined position, calculates a matching degree between the road environment of the surroundings of the vehicle and a road environment in the predetermined position represented by the map data, and causes a communication circuit mounted on the vehicle to transmit the sensor data and information representing the matching degree to the map server. The map server transmits the map data by utilizing sensor data, among the sensor data received via a communication device, having a matching degree less than a matching degree threshold with a higher priority than sensor data having a matching degree or greater than the matching degree threshold.Type: GrantFiled: April 1, 2021Date of Patent: November 14, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Ryo Igarashi
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Publication number: 20230344522Abstract: A coherent optical reception device includes a coherent receiver that receives signal light in which an AMCC signal is superimposed on a main signal, converts the signal light into an analog electric signal, and outputs an in-phase component and a quadrature-phase component of a reception signal for each polarization state, and a polarization combiner that performs polarization combining on the in-phase component and the quadrature-phase component of the reception signal output from the coherent receiver for each polarization state and outputs the reception signal as an AMCC signal identification reception signal that is the reception signal used for identification of the AMCC signal and a main signal identification reception signal that is the reception signal used for identification of the main signal.Type: ApplicationFiled: September 23, 2020Publication date: October 26, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo IGARASHI, Masamichi FUJIWARA, Takuya KANAI
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Publication number: 20230318713Abstract: An optical transmission apparatus includes an optical transmitter that generates an optical signal in an uplink direction by modulating output light of a laser that outputs light of a first frequency with a subcarrier on which transmission data is superimposed, a heterodyne detection unit that receives an optical signal in a downlink direction by heterodyne detection, a control unit that calculates a first intermediate frequency based on the frequency of the downlink signal received by the heterodyne detection and the first frequency of the laser, and controls the first frequency of the laser when there is a difference between the calculated first intermediate frequency and a reference second intermediate frequency by a threshold or more.Type: ApplicationFiled: September 9, 2020Publication date: October 5, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo IGARASHI, Masamichi FUJIWARA, Junichi KANI
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Publication number: 20230308189Abstract: There is provided an optical power feeding system including: an optical power feeding unit; and a plurality of drop units configured to be able to receive light from the optical power feeding unit as an input, branch the input light, and output branched light, in which, the optical power feeding unit includes a power-feed light generating unit that outputs power-feed light, and the drop unit includes: an optical splitter that branches the power-feed light into first branch light and second branch light and outputs the second branch light to another drop unit; a photoelectric conversion unit that performs photoelectric conversion of the first branch light; and a branch ratio control unit that is driven by electricity generated by the photoelectric conversion and controls a branch ratio that is a ratio between the first branch light and the second branch light.Type: ApplicationFiled: July 29, 2020Publication date: September 28, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo IGARASHI, Masamichi FUJIWARA, Takuya KANAI
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Publication number: 20230299848Abstract: An optical access system includes an optical transmission device and an optical reception device. In the optical access system, the optical transmission device includes: a signal generation unit that generates a plurality of optical signals by generating monitoring control signals including identical information in predetermined cycles and superimposing the monitoring control signal on a main signal each time generating the monitoring control signal; and a transmission unit that transmits the generated optical signals to the optical reception device.Type: ApplicationFiled: August 5, 2020Publication date: September 21, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masamichi FUJIWARA, Ryo IGARASHI
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Publication number: 20230291484Abstract: A branch ratio setting system includes: a branch ratio control unit; and a plurality of drop units configured to be able to receive an optical signal from the branch ratio control unit, and configured to branch and output the received optical signal, and the branch ratio control unit outputs light to the plurality of drop units via an optical fiber to measure characteristics of the optical fiber, and outputs a branch ratio determination signal to each of the plurality of drop units via the optical fiber based on the measured characteristics of the optical fiber, and the drop unit includes an optical splitter connected to the optical fiber and having a variable branch ratio and a branch ratio setting unit that sets the branch ratio of the optical splitter based on the branch ratio determination signal input via the optical fiber.Type: ApplicationFiled: July 29, 2020Publication date: September 14, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo IGARASHI, Masamichi FUJIWARA, Takuya KANAI
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Publication number: 20230261750Abstract: A branch ratio calculation method in an optical communication system constituting a tree-structured network in which a first communication device is used as a root node, a plurality of optical splitters are used as intermediate nodes, and a plurality of second communication devices are used as leaf nodes, the method including a calculation step of calculating branch ratios of the plurality of optical splitters based on a length of a transmission path between the first communication device and the optical fiber in order from a hierarchy of the tree-structured network so that the second communication device receives light transmitted by the first communication device at a target intensity.Type: ApplicationFiled: July 29, 2020Publication date: August 17, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo IGARASHI, Masamichi FUJIWARA
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Publication number: 20230224034Abstract: An optical amplification estimation method includes by an excitation light output unit connected to a first end of a first optical transmission line, making excitation light incident on the first optical transmission line, by a monitoring unit connected to the same side as the first end of the first optical transmission line, making monitoring light incident on the first optical transmission line, the monitoring light having a wavelength different from a wavelength of the excitation light, by the monitoring unit, measuring intensity of light incident on the monitoring unit when the excitation light is incident, and intensity of light incident on the monitoring unit when the excitation light is not incident, and by an amplification estimation unit, estimating a gain of an optical signal in the first optical transmission line based on the light intensity measured in the measuring.Type: ApplicationFiled: May 28, 2020Publication date: July 13, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Ryo IGARASHI, Masamichi FUJIWARA, Takuya KANAI
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Publication number: 20230208528Abstract: An optical reception apparatus includes an optical coherent reception unit that generates an I-axis component of a reception signal and a Q-axis component of the reception signal based on an optical signal subjected to continuous phase frequency shift keying, a conversion unit that generates a digital signal of the I-axis component of the reception signal and a digital signal of the Q-axis component of the reception signal, a differential detection unit that generates a differential detection signal, a frequency offset compensation unit that derives a phase change amount or a temporal change in the Q-axis component of the differential detection signal whose component of a frequency offset has been compensated, a clock error detection unit that detects an amount of shift of a sampling phase of the differential detection signal whose component of the frequency offset has been compensated, based on the phase change amount or the temporal change in the Q-axis component of the differential detection signal, and aType: ApplicationFiled: May 27, 2020Publication date: June 29, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventor: Ryo IGARASHI