Patents by Inventor Seigo Takahashi
Seigo Takahashi 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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Publication number: 20220188348Abstract: A content management device includes: a storage that stores (a) a content generated by imaging performed by a first terminal that is at least one of a plurality of terminals, (b) a time at which the imaging of the content was performed, and (c) a history indicating whether each of one or more terminals among the plurality of terminals excluding a second terminal received, during a period that includes the time at which the imaging was performed, a beacon signal transmitted from the second terminal by radio waves, the second terminal being at least one of the plurality of terminals; and a manager that manages the content as a permissible content that is permitted to be presented by the plurality of terminals when determining, with reference to the storage, that each of the one or more terminals received the beacon signal during the period.Type: ApplicationFiled: March 2, 2022Publication date: June 16, 2022Inventors: Hiroshi YAHATA, Seigo TAKAHASHI
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Patent number: 11301512Abstract: A content management device includes: a storage that stores (a) a content generated by imaging performed by a first terminal that is at least one of a plurality of terminals, (b) a time at which the imaging of the content was performed, and (c) a history indicating whether each of one or more terminals among the plurality of terminals excluding a second terminal received, during a period that includes the time at which the imaging was performed, a beacon signal transmitted from the second terminal by radio waves, the second terminal being at least one of the plurality of terminals; and a manager that manages the content as a permissible content that is permitted to be presented by the plurality of terminals when determining, with reference to the storage, that each of the one or more terminals received the beacon signal during the period.Type: GrantFiled: October 1, 2018Date of Patent: April 12, 2022Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hiroshi Yahata, Seigo Takahashi
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Publication number: 20210288833Abstract: An information notification system includes apparatuses and first server. The apparatuses include a first device. Each of at least one of the apparatuses includes a sensor unit that senses whether any person is present and generates a presence-absence signal including person presence-absence information. A first device includes a generator that generates a notification signal including notification information that is to be provided to the user. A first server includes an information acquirer that acquires the person presence-absence information, and a presentation controller that determines a presumed position and causes a second device to present the notification information, and the second device being one of one or more apparatuses that are capable of presenting the notification information to the person who is in the presumed position among the apparatuses. A presentation controller changes a form of presentation in accordance with presentation setting information that is information about the person.Type: ApplicationFiled: February 20, 2020Publication date: September 16, 2021Inventors: Kohsuke YAMAMOTO, Masahiro OHHO, Seigo TAKAHASHI, Hiroki URABE
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Publication number: 20210158682Abstract: An information notification system includes apparatuses and a first server. The apparatuses include a first device. Each of at least one of the apparatuses includes a sensor unit that discriminates between at least one person and generates a presence-absence signal including presence-absence information about each person. A first device includes a generator that generates a notification signal including notification information that is to be provided to the user and user information for use in identifying the user. A first server includes an information acquirer that acquires the user information, the notification information, and the presence-absence information, and a presentation controller that determines a presumed position of the user presumed based on the user information and the presence-absence information and causes one of apparatuses that are capable of presenting the notification information to the user who is in the presumed position among the apparatuses to present the notification information.Type: ApplicationFiled: February 20, 2020Publication date: May 27, 2021Inventors: Kohsuke YAMAMOTO, Masahiro OHHO, Seigo TAKAHASHI, Hiroki URABE
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Patent number: 10862593Abstract: The objective of the present invention is to reduce the size of a receiving device circuit in an optical space communication system while maintaining communication stability. A data receiving device which decodes one item of data from a plurality of input signals includes: two or more digital signal processing means for subjecting the plurality of input signals to signal processing; a first recording means for temporarily recording the plurality of input signals; a SN ratio estimating means for estimating S/N ratios of each of the plurality of input signals and determining the number of the plurality of input signals to be combined, and the signals to be combined; and a scheduling means for carrying out overall control on the basis of the results from the SN ratio estimating means.Type: GrantFiled: March 17, 2017Date of Patent: December 8, 2020Assignee: NEC CORPORATIONInventors: Kohei Hosokawa, Toshiharu Ito, Seigo Takahashi, Manabu Arikawa, Takashi Ishikawa, Yoshimasa Ono
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Publication number: 20200304213Abstract: The objective of the present invention is to reduce the size of a receiving device circuit in an optical space communication system while maintaining communication stability. A data receiving device which decodes one item of data from a plurality of input signals includes: two or more digital signal processing means for subjecting the plurality of input signals to signal processing; a first recording means for temporarily recording the plurality of input signals; a SN ratio estimating means for estimating S/N ratios of each of the plurality of input signals and determining the number of the plurality of input signals to be combined, and the signals to be combined; and a scheduling means for carrying out overall control on the basis of the results from the SN ratio estimating means.Type: ApplicationFiled: March 17, 2017Publication date: September 24, 2020Applicant: NEC CorporationInventors: Kohei HOSOKAWA, Toshiharu ITO, Seigo TAKAHASHI, Manabu ARIKAWA, Takashi ISHIKAWA, Yoshimasa ONO
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Publication number: 20200019566Abstract: A content management device includes: a storage that stores (a) a content generated by imaging performed by a first terminal that is at least one of a plurality of terminals, (b) a time at which the imaging of the content was performed, and (c) a history indicating whether each of one or more terminals among the plurality of terminals excluding a second terminal received, during a period that includes the time at which the imaging was performed, a beacon signal transmitted from the second terminal by radio waves, the second terminal being at least one of the plurality of terminals; and a manager that manages the content as a permissible content that is permitted to be presented by the plurality of terminals when determining, with reference to the storage, that each of the one or more terminals received the beacon signal during the period.Type: ApplicationFiled: October 1, 2018Publication date: January 16, 2020Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Hiroshi YAHATA, Seigo TAKAHASHI
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Patent number: 10511409Abstract: An appropriate synthesized signal cannot be obtained by only correcting relative phase errors of a plurality of received signals; therefore, a received signal processor according to an exemplary aspect of the present invention includes a plurality of signal-to-noise ratio estimation means for estimating respective signal-to-noise ratios of a plurality of digital signal sequences in which relative phase errors of a plurality of received signal sequences having been corrected; a plurality of temporary decision means for performing symbol decisions of the plurality of digital signal sequences and outputting symbol signal sequences; symbol-map-rotation determination means for determining respective phase rotation amounts of the plurality of digital signal sequences from the plurality of symbol signal sequences and the respective signal-to-noise ratios of the plurality of digital signal sequences; and a plurality of phase rotation means for rotating phases of the plurality of digital signal sequences respectivelyType: GrantFiled: November 1, 2016Date of Patent: December 17, 2019Assignee: NEC CORPORATIONInventors: Kohei Hosokawa, Toshiharu Ito, Manabu Arikawa, Seigo Takahashi, Takashi Ishikawa, Yoshimasa Ono
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Patent number: 10454577Abstract: It is difficult in a free space optical transmitter to transmit a beacon beam stably at low cost, and that it is impossible to maintain stable tracking; therefore, a free space optical transmitter according to an exemplary aspect of the present invention includes a laser beam transmitting means for transmitting a plurality of laser beams capable of interfering with each other and differing in one of an optical frequency and a time variation in a phase difference; and a wavefront control beam transmitting means for transmitting, to a free space, a plurality of wavefront control beams obtained by making each of the plurality of laser beams have a different wavefront.Type: GrantFiled: August 17, 2016Date of Patent: October 22, 2019Assignee: NEC CORPORATIONInventors: Seigo Takahashi, Toshiharu Ito, Kohei Hosokawa, Manabu Arikawa, Yoshimasa Ono, Takashi Ishikawa
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Patent number: 10411802Abstract: A receiving-side splitter 4 that constitutes part of an optical communication device 1 splits a receiving-side signal light into a plurality of lights at a splitting ratio according to the intensity distribution of mutually different propagation modes included in the receiving-side signal light passed through a transmission medium 3. A transmission-side splitter 10 splits a transmission-side signal light into a plurality of-lights. A signal processing device 5 detects the light intensity and/or the phase of the receiving-side signal light, and sets a control target value for the light intensity and/or the phase of the transmission-side signal light to a value according to the result of the detection. A modulator 9 adjusts the light intensity or the phase of a the transmission-side signal light so that the light intensity or phase equals the set value. A multiplexer 8 multiplexes the plurality of transmission-side signal lights.Type: GrantFiled: July 15, 2016Date of Patent: September 10, 2019Assignee: NEC CORPORATIONInventors: Akihiro Tanaka, Toshiharu Ito, Kohei Hosokawa, Seigo Takahashi, Manabu Arikawa
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Patent number: 10313011Abstract: It is difficult in a free space optical receiver to satisfy both of the stable receiving and the highly sensitive receiving; therefore, a free space optical receiver according to an exemplary aspect of the present invention includes a light collecting means for collecting laser light having propagated through a free space transmission path; a multimode light generating means for receiving input of the laser light collected by the light collecting means, exciting multimode light, and outputting multimode propagation light including a plurality of propagation mode light beams with a number smaller than a number of multimode light beams possible to be excited; and a mode separating means for separating the multimode propagation light into the plurality of propagation mode light beams and outputting the plurality of propagation mode light beams.Type: GrantFiled: November 18, 2015Date of Patent: June 4, 2019Assignee: NEC CORPORATIONInventors: Seigo Takahashi, Toshiharu Ito, Akihiro Tanaka, Kohei Hosokawa, Manabu Arikawa
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Patent number: 10256904Abstract: The circuit size of a signal processing circuit increases in a free space optical receiver, which increases in cost, because the signal processing becomes complex attempting to improve the coupling efficiency between received light and a fiber; therefore, a free space optical receiver according to an exemplary aspect of the present invention includes a light collecting means for collecting laser light having propagated through a free space transmission path; a multi-mode transmission medium for receiving input of the laser light and outputting multi-mode light; a multi-mode signal processing means for outputting a plurality of received electrical signals based on part of the multi-mode light; a monitor means for monitoring signal information based on the multi-mode light; a control means for controlling an operation of the multi-mode signal processing means based on the signal information; and a signal processing means for performing signal processing on the plurality of received electrical signals and outputType: GrantFiled: July 17, 2015Date of Patent: April 9, 2019Assignee: NEC CorporationInventors: Seigo Takahashi, Toshiharu Ito, Kohei Hosokawa
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Publication number: 20180323904Abstract: An appropriate synthesized signal cannot be obtained by only correcting relative phase errors of a plurality of received signals; therefore, a received signal processor according to an exemplary aspect of the present invention includes a plurality of signal-to-noise ratio estimation means for estimating respective signal-to-noise ratios of a plurality of digital signal sequences in which relative phase errors of a plurality of received signal sequences having been corrected; a plurality of temporary decision means for performing symbol decisions of the plurality of digital signal sequences and outputting symbol signal sequences; symbol-map-rotation determination means for determining respective phase rotation amounts of the plurality of digital signal sequences from the plurality of symbol signal sequences and the respective signal-to-noise ratios of the plurality of digital signal sequences; and a plurality of phase rotation means for rotating phases of the plurality of digital signal sequences respectivelyType: ApplicationFiled: November 1, 2016Publication date: November 8, 2018Applicant: NEC CORPORATIONInventors: Kohei HOSOKAWA, Toshiharu ITO, Manabu ARIKAWA, Seigo TAKAHASHI, Takashi ISHIKAWA, Yoshimasa ONO
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Patent number: 10122447Abstract: It is impossible to prevent the deterioration of the coupling efficiency between received light and a single mode fiber, and difficult to achieve a higher transmission rate, with respect to a free space optical communication receiver; therefore, a free space optical receiver according to an exemplary aspect of the present invention includes light collecting means for collecting laser light having propagated through a free space transmission path; mode controlling means for separating the laser light collected by the light collecting means into a plurality of propagation mode beams depending on a wave-front fluctuation of the laser light and outputting the propagation mode beams; a plurality of single mode transmission media for guiding the plurality of propagation mode beams, respectively; and a plurality of light receiving means for receiving the plurality of propagation mode beams respectively through the plurality of single mode transmission media.Type: GrantFiled: March 13, 2014Date of Patent: November 6, 2018Assignee: NEC CORPORATIONInventors: Seigo Takahashi, Toshiharu Ito, Kohei Hosokawa
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Publication number: 20180234180Abstract: It is difficult in a free space optical transmitter to transmit a beacon beam stably at low cost, and that it is impossible to maintain stable tracking; therefore, a free space optical transmitter according to an exemplary aspect of the present invention includes a laser beam transmitting means for transmitting a plurality of laser beams capable of interfering with each other and differing in one of an optical frequency and a time variation in a phase difference; and a wavefront control beam transmitting means for transmitting, to a free space, a plurality of wavefront control beams obtained by making each of the plurality of laser beams have a different wavefront.Type: ApplicationFiled: August 17, 2016Publication date: August 16, 2018Applicant: NEC CORPORATIONInventors: Seigo TAKAHASHI, Toshiharu ITO, Kohei HOSOKAWA, Manabu ARIKAWA, Yoshimasa ONO, Takashi ISHIKAWA
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Publication number: 20180212681Abstract: A receiving-side splitter 4 that constitutes part of an optical communication device 1 splits a receiving-side signal light into a plurality of lights at a splitting ratio according to the intensity distribution of mutually different propagation modes included in the receiving-side signal light passed through a transmission medium 3. A transmission-side splitter 10 splits a transmission-side signal light into a plurality of-lights. A signal processing device 5 detects the light intensity and/or the phase of the receiving-side signal light, and sets a control target value for the light intensity and/or the phase of the transmission-side signal light to a value according to the result of the detection. A modulator 9 adjusts the light intensity or the phase of a the transmission-side signal light so that the light intensity or phase equals the set value. A multiplexer 8 multiplexes the plurality of transmission-side signal lights.Type: ApplicationFiled: July 15, 2016Publication date: July 26, 2018Applicant: NEC CORPORATIONInventors: Akihiro TANAKA, Toshiharu ITO, Kohei HOSOKAWA, Seigo TAKAHASHI, Manabu ARIKAWA
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Publication number: 20170264365Abstract: It is difficult in a free space optical receiver to satisfy both of the stable receiving and the highly sensitive receiving; therefore, a free space optical receiver according to an exemplary aspect of the present invention includes a light collecting means for collecting laser light having propagated through a free space transmission path; a multimode light generating means for receiving input of the laser light collected by the light collecting means, exciting multimode light, and outputting multimode propagation light including a plurality of propagation mode light beams with a number smaller than a number of multimode light beams possible to be excited; and a mode separating means for separating the multimode propagation light into the plurality of propagation mode light beams and outputting the plurality of propagation mode light beams.Type: ApplicationFiled: November 18, 2015Publication date: September 14, 2017Applicant: NEC CorporationInventors: Seigo TAKAHASHI, Toshiharu ITO, Akihiro TANAKA, Kohei HOSOKAWA, Manabu ARIKAWA
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Publication number: 20170207850Abstract: The circuit size of a signal processing circuit increases in a free space optical receiver, which increases in cost, because the signal processing becomes complex attempting to improve the coupling efficiency between received light and a fiber; therefore, a free space optical receiver according to an exemplary aspect of the present invention includes a light collecting means for collecting laser light having propagated through a free space transmission path; a multi-mode transmission medium for receiving input of the laser light and outputting multi-mode light; a multi-mode signal processing means for outputting a plurality of received electrical signals based on part of the multi-mode light; a monitor means for monitoring signal information based on the multi-mode light; a control means for controlling an operation of the multi-mode signal processing means based on the signal information; and a signal processing means for performing signal processing on the plurality of received electrical signals and outputType: ApplicationFiled: July 17, 2015Publication date: July 20, 2017Applicant: NEC CorporationInventors: Seigo TAKAHASHI, Toshiharu ITO, Kohei HOSOKAWA
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Publication number: 20170070289Abstract: It is impossible to prevent the deterioration of the coupling efficiency between received light and a single mode fiber, and difficult to achieve a higher transmission rate, with respect to a free space optical communication receiver; therefore, a free space optical receiver according to an exemplary aspect of the present invention includes light collecting means for collecting laser light having propagated through a free space transmission path; mode controlling means for separating the laser light collected by the light collecting means into a plurality of propagation mode beams depending on a wave-front fluctuation of the laser light and outputting the propagation mode beams; a plurality of single mode transmission media for guiding the plurality of propagation mode beams, respectively; and a plurality of light receiving means for receiving the plurality of propagation mode beams respectively through the plurality of single mode transmission media.Type: ApplicationFiled: March 13, 2014Publication date: March 9, 2017Applicant: NEC CorporationInventors: Seigo TAKAHASHI, Toshiharu ITO, Kohei HOSOKAWA
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Patent number: 9160529Abstract: A user request can be reflected in the degree of security of an updated key in quantum key distribution. A sender and a receiver are connected through optical fiber. A quantum transmitter in the sender and a quantum receiver in the receiver carry out basis reconciliation and error correction through a quantum channel, based on a source of a key sent from the quantum transmitter and on a raw key received by the quantum receiver. Under the control of security control sections in the sender and receiver, the amount of information having the possibility of being intercepted, which is determined in accordance with a degree of security requested by a user, is removed from the key information after error correction, whereby a final cryptographic key is generated. Secret communication is performed between encryption/decryption sections in the sender and receiver by using the cryptographic key thus updated.Type: GrantFiled: August 18, 2006Date of Patent: October 13, 2015Assignee: NEC CORPORATIONInventors: Akio Tajima, Akihiro Tanaka, Wakako Maeda, Seigo Takahashi