Patents Assigned to Nippon Telegraph and Telephone Corporation
  • Publication number: 20210296847
    Abstract: An optical amplifier repeater system includes an optical fiber propagating a light beam in a plurality of propagation modes and an optical amplifier repeater amplifying the light beam propagated through the optical fiber. The optical amplifier repeater includes an optical demultiplexer demultiplexing the light beam in the plurality of propagation modes propagated through the optical fiber into a plurality of single-mode light beams, an optical amplifier amplifying, by simultaneous pumping, intensities of the plurality of single-mode light beams using a light beam generated by one pumping light source, an optical multiplexer multiplexing the plurality of single-mode light beams amplified by the optical amplifier into a light beam in the plurality of propagation modes, and an optical intensity adjusting unit adjusting the intensity of each of the plurality of single-mode light beams at least one of before or after the amplification by the optical amplifier.
    Type: Application
    Filed: July 5, 2019
    Publication date: September 23, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takayuki MIZUNO, Koki SHIBAHARA, Akira ISODA, Takayuki KOBAYASHI, Yutaka MIYAMOTO
  • Publication number: 20210297308
    Abstract: A communication device including a first communication device and a plurality of second communication devices in an optical access system in which a first communication device and the plurality of second communication devices perform communications with each other under a time division multiple access scheme includes an Ethernet controller configured to implement the communications as Ethernet (registered trademark) communications, and a link failure processing unit configured to output, in response to reception of a link failure notification for notifying occurrence of a link failure in the communications from the first communication device, a termination instruction to terminate data transmission when the communication device is performing the data transmission to the first communication device, and a start instruction to start the data transmission after recovery from the link failure when the communication device is not performing the data transmission to the first communication device.
    Type: Application
    Filed: July 5, 2019
    Publication date: September 23, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takamitsu TOCHINO, Takashi MITSUI, Tomoya HATANO
  • Publication number: 20210295214
    Abstract: A learning apparatus including a biological information acquisition unit that acquires biological information, the biological information being information indicating a vital reaction of a test subject to a predetermined environment, an emotional information acquisition unit that acquires emotional information, the emotional information being information indicating an emotion of the test subject toward the environment, a first environmental information acquisition unit that acquires environmental information, the environmental information being information indicating an attribute of the environment acting on the test subject, and a relationship information learning unit that learns, through machine learning, a relationship among the biological information, the emotional information, and the environmental information based on the biological information, the emotional information, and the environmental information.
    Type: Application
    Filed: June 28, 2019
    Publication date: September 23, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventor: Yohei KATAYAMA
  • Publication number: 20210297124
    Abstract: A reception unit in a radio communication apparatus receives wirelessly a signal configured with a preamble from another radio communication apparatus. The synchronization detection unit uses the preamble included in the signal received by the reception unit to detect synchronization with another radio communication apparatus. The signal accumulation unit accumulates a signal extracted from the signal received by the reception unit based on a timing at which the synchronization is detected by the synchronization detection unit. The combining unit combines the signals accumulated in the signal accumulation unit in accordance with a blind adaptive array antenna algorithm. The demodulation unit demodulates the signals combined by the combining unit.
    Type: Application
    Filed: June 25, 2019
    Publication date: September 23, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hajime KATSUDA, Yosuke FUJINO, Kazunori AKABANE
  • Publication number: 20210294985
    Abstract: The present invention makes it possible to generate a paraphrastic sentence that has a similar meaning to the original sentence despite a local word/phrase difference, or a non-paraphrastic sentence that is not a paraphrase despite having a similar meaning to the original sentence in terms of the entire sentence. An estimation unit 22 estimates a word deletion probability for each of words constituting an input sentence, by using a positive example model that has been trained based on a positive example constituted by a sentence and a paraphrastic sentence of the sentence, and is used to generate a paraphrastic sentence by deleting a word, or by using a negative example model that has been trained based on a negative example constituted by the sentence and a non-paraphrastic sentence of the sentence, and is used to generate a non-paraphrastic sentence by deleting a word.
    Type: Application
    Filed: July 23, 2019
    Publication date: September 23, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Itsumi SAITO, Kyosuke NISHIDA, Hisako ASANO, Junji TOMITA
  • Publication number: 20210294819
    Abstract: A clustering device includes a storage means configured to store a transposed file including array elements in a storage unit, the array elements storing a pair in which a cluster identifier and a first non-zero feature quantity of a mean feature vector are associated with each feature identifier, a calculation means configured to calculate a distance between the object feature vector in sparse representation indicating the object feature vector in a pair in which a second non-zero feature quantity of the object feature vector and a feature identifier of the second non-zero feature quantity are associated with each other, and the mean feature vector of each cluster, and an assignment means configured to assign the object feature vector to one of the plurality of clusters on the basis of the distance, and the calculation means calculates a product of a second non-zero feature quantity and a first non-zero feature quantity stored in an array element of an index based on a feature identifier corresponding to the
    Type: Application
    Filed: April 24, 2019
    Publication date: September 23, 2021
    Applicant: Nippon Telegraph and Telephone Corporation
    Inventors: Kazuo AOYAMA, Takashi HATTORI
  • Publication number: 20210295112
    Abstract: An image identification device can be trained to identify classes with high accuracy even in cases with a small number of learning images.
    Type: Application
    Filed: July 17, 2019
    Publication date: September 23, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Go IRIE, Yu MIZUTSUMI
  • Patent number: 11126058
    Abstract: The present invention provides a highly reliable, high-speed, and low-loss semiconductor optical modulation element that protects a pin junction structure in a modulation region against reverse voltage ESD by configuring an additional capacity having a thyristor structure between a plurality of feeding pad electrodes. An n-type contact layer, an n-type cladding layer, a non-doped core/cladding layer, a p-type cladding layer, and a p-type contact layer are sequentially laminated on the substrate surface. A Mach-Zehnder interferometric waveguide and a plurality of feeding pad installation sections are formed by dry etching. The n-type contact layer and the n-type cladding layer are removed except for a modulation region of the Mach-Zehnder interferometric waveguide and a feeding region in which the feeding pad installation sections are formed so that the modulation region and the semiconductor of the lower part of the feeding region are electrically isolated from each other.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: September 21, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoshihiro Ogiso, Hiroyasu Mawatari, Nobuhiro Kikuchi
  • Patent number: 11128569
    Abstract: A load distribution system has: determination means for determining, upon an input port receiving a packet, a flow attribute indicating whether a flow configured by the packet is a flow that tends to include many long packets or a flow that tends to include many short packets; and output means for outputting the packet to a packet transfer device in a load state indicating that a load applied by the flow of the flow attribute is low, of a plurality of packet transfer devices, in accordance with the flow attribute determined by the determination means.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: September 21, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Akihiro Kimura, Hideaki Iwata, Akihiro Okada, Hideo Tsuchiya, Shunsuke Homma, Katsuma Miyamoto
  • Patent number: 11128400
    Abstract: A bit assignment estimating device that accurately estimates bit assignment of a payload with fewer division patterns is provided. The bit assignment estimating device: divides a payload of received communication data to generate a plurality of blocks; estimates bit assignment of a block to be a certain value type; concatenates a block, which is adjacent to either of a block or a concatenation block which is estimated to be the continuous value type at a higher-order bit side, to the block or the concatenation block which is estimated to be the continuous value type when the block adjacent is estimated to be the status value type or the continuous value type; estimates whether the concatenation block is the continuous value type or not; and separates an immediately-close-concatenated block from a corresponding concatenation block when the concatenation block is estimated not to be the continuous value type.
    Type: Grant
    Filed: November 14, 2018
    Date of Patent: September 21, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takuma Koyama, Masashi Tanaka, Yasushi Okano
  • Publication number: 20210287573
    Abstract: Calculation time is reduced without degrading approximation accuracy in calculation of a complicated function through secure computation. A secret batch approximation system calculates a concealed text [z] of an approximate value z for a function value y satisfying yj=f(xj) by using a concealed text [x] of a value x as input. g is defined as a polynomial for approximating each section of m sections into which the function f is divided. A parameter acquisition unit acquires a concealed text [a] of a parameter a corresponding to the value x for each integer j that is not less than 1 and not more than n, where aj is defined as a parameter pi corresponding to a section Ri including a value xj. A polynomial calculation unit calculates a polynomial g([x], [a]) by using the concealed text [x] of the value x as input based on the concealed text [a].
    Type: Application
    Filed: May 20, 2019
    Publication date: September 16, 2021
    Applicant: Nippon Telegraph and Telephone Corporation
    Inventor: Koki HAMADA
  • Publication number: 20210286593
    Abstract: A random number generation apparatus comprises: a first random number generating part 2 generating a random number u=(u1, . . . ,uD)T?[??,?]D; a second random number generating part 3 generating a random number v?[0,f?max]; and a determining part 4 determining whether f?(x1=u1, . . . ,xD=uD)?v or not, and, if f?(x1=u1, . . . ,xD=uD)?v, adopting u as a random number according to f?(x1, . . . ,xD), wherein D is a predetermined positive integer, for i=1, . . . ,D, [hi] is a predetermined possible range for a random variable xi, a hole [h] is [h]=([h1], . . . ,[hD])T, H is a probability of a predetermined basic distribution function f(x1, . . . ,xD) in the hole [h], ?=1/(1?H), a corrected distribution function f?(x1, . . . ,xD) is defined by Expressions (1) and (2), and f?max is a maximum value of f?(x1, . . . ,xD).
    Type: Application
    Filed: January 12, 2018
    Publication date: September 16, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Rina OKADA, Satoshi HASEGAWA, Shogo MASAKI
  • Publication number: 20210288723
    Abstract: An optical transmission system includes ground stations; optical-terminating devices; a traffic-monitoring unit that detects a traffic amount of the uplink signal transmitted in a time-division multiplexing manner for each of the optical-terminating devices; and a bandwidth allocation calculation unit that estimates one optical-terminating device of the optical-terminating devices connected to one ground station of the ground stations having a cell where the moving object is positioned on the basis of the traffic amount, and calculates a first allocation amount of a bandwidth allocated to the uplink signal of the one optical-terminating device connected to the one ground station having the cell where the moving object is positioned and a second allocation amount of a bandwidth allocated to the uplink signal of another optical-terminating device of the optical-terminating devices connected to another ground station of the ground stations having a cell adjacent to the cell where the moving object is positioned.
    Type: Application
    Filed: September 8, 2017
    Publication date: September 16, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Daisuke HISANO, Tatsuya SHIMADA, Hiroshi OU, Hiroko NOMURA
  • Patent number: 11120809
    Abstract: A coding method and a decoding method are provided which can use in combination a predictive coding and decoding method which is a coding and decoding method that can accurately express coefficients which are convertible into linear prediction coefficients with a small code amount and a coding and decoding method that can obtain correctly, by decoding, coefficients which are convertible into linear prediction coefficients of the present frame if a linear prediction coefficient code of the present frame is correctly input to a decoding device.
    Type: Grant
    Filed: July 31, 2019
    Date of Patent: September 14, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Noboru Harada
  • Patent number: 11122363
    Abstract: An acoustic signal processing device 1 includes: a focal point position determination unit 12 that obtains a plurality of sets of initial focal point coordinates, coordinates of the virtual sound source, and a direction of directivity thereof, and for a pair of sets of initial focal point coordinates with different polarities among the plurality of sets of initial focal point coordinates, multiplies the sets of initial focal point coordinates by a rotation matrix based on the coordinates of the virtual sound source to thereby determine sets of focal point coordinates, the rotation matrix being specified from the direction of the directivity; a circular harmonic coefficient conversion unit 13 that calculates weights to be applied to multipoles including the sets of focal point coordinates from a circular harmonic coefficient; a filter coefficient computation unit 14 that, for each of the speakers in the speaker array, computes a weighted driving function to be applied to the speaker from the sets of focal poin
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: September 14, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kimitaka Tsutsumi, Kenichi Noguchi, Hideaki Takada, Yoichi Haneda
  • Patent number: 11121868
    Abstract: Fisher's exact test is efficiently computed through secure computation. A computation range determination part determines i0, i1, x0, x1. A preliminary computation part computes f(x0), . . . , f(x1), and generates an array M=(f(x0), . . . , f(x1)). A securing part secures the array M, and generates a secure text array <M>=(<f(x0)>, . . . , <f(x1)>). A batch-reading part generates a function value secure text (<f(ai)>, <f(bi)>, <f(ci)>, <f(di)>) (i0?i?i1).
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: September 14, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventor: Koki Hamada
  • Publication number: 20210281540
    Abstract: An identification device specifies a boundary which divides rows of IP addresses, which are included in an IP address block and sorted in a predetermined order, into a plurality of parts based on AS numbers, e2LDs, PTR records, etc. of the IP addresses. When the number of the IP addresses included in the part divided by the boundary is equal to or more than a parameter N, which can be arbitrarily set, an identification unit identifies the IP addresses included in the part as dynamic IP addresses.
    Type: Application
    Filed: April 16, 2019
    Publication date: September 9, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Daiki CHIBA, Mitsuaki AKIYAMA
  • Publication number: 20210281453
    Abstract: A first wireless communication apparatus assigns a pilot signal without an effective signal component at least in an adjacent frequency component to a generated transmit signal, and transmits the transmit signal including the pilot signal. A second wireless communication apparatus converts the received signal or a frequency-converted signal obtained by frequency conversion of the signal into a signal in a frequency domain, sets an approximate value of the distance between the second wireless communication apparatus and the first wireless communication apparatus, calculates a coefficient ?k, based on the approximate value of the distance, the effective bandwidth, the speed of light, the number of FFT points, and the frequency component number, extracts a signal in the frequency domain, generates a phase noise compensated sampling signal, and reproduces data transmitted by the first wireless communication apparatus.
    Type: Application
    Filed: June 26, 2019
    Publication date: September 9, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Atsushi OTA, Kota ITO, Kazuto GOTO, Yushi SHIRATO, Naoki KITA
  • Publication number: 20210279484
    Abstract: A technology is provided whereby a lane can be correctly estimated without relying on lane markers. A shape indicating a road region is extracted from image data obtained by capturing images in the progression direction of a vehicle 6 and, on the basis of information indicating the shape, the angle of inclination for one contour line, the center-of-gravity coordinates for a diagram indicating the shape of the road region, the angle between two consecutive contour lines across one vertex of the diagram indicating the shape, and the area of the diagram indicating the shape are calculated as feature values for the shape of the road region. In addition, the lane in which the vehicle 6 is traveling can be estimated by determining whether or not the calculated feature values are included in a threshold value range preset for each lane.
    Type: Application
    Filed: June 20, 2019
    Publication date: September 9, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kohei MORI, Ippei SHAKE, Yuki YOKOHATA, Manabu YOSHIDA
  • Publication number: 20210280145
    Abstract: A display device and a display method which can reproduce kinematic parallax and express a high sense of realism without using image display means are provided. The display device includes an image display unit having a stripe structure having subpixels of a plurality of colors disposed so that subpixels of the same color are arranged in a first direction and enabling an observer to observe, through an aperture, an image formed by pixels, each pixel being constituted by the subpixels of a plurality of colors. The aperture has a shape in which areas of the subpixels of the plurality of colors which can be seen through the aperture are uniform, and in which a numerical aperture decreases along a second direction orthogonal to the first direction. A plurality of the apertures are provided so as not to overlap with each other.
    Type: Application
    Filed: June 21, 2019
    Publication date: September 9, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Munekazu DATE, Megumi ISOGAI, Hideaki KIMATA