Patents Assigned to Nippon Telegraph and Telephone Corp.
  • Patent number: 9086555
    Abstract: It is an object of the present invention to suppress a coating resin from being shaved off in an event where optical fibers are sent out from a coating dice. When a Young's modulus of ultraviolet curable resins 13 located on outermost layers of optical fibers 3 is 300 MPa or more, and the Young's modulus is 300 MPa to 600 MPa, a plurality of the optical fibers 3 in which friction force measured by the following measurement method is 0.3 N or less are arranged in parallel to one another, these respective optical fibers 3 are fixed to one another intermittently along a longitudinal direction thereof, and adhered portions 5 are formed.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: July 21, 2015
    Assignees: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Akira Namazue, Yukiko Take, Takashi Matsuzawa, Ken Osato, Naoki Okada, Yusuke Yamada
  • Publication number: 20140230375
    Abstract: Provided is a method for packing a cable having a static friction coefficient of 0.15 or more and 0.50 or less, a dynamic friction coefficient of 0.10 or more and 0.40 or less and a bending rigidity of 60 gf or more and 350 gf or less. The method includes the steps of: (1) winding the cable into a figure-of-eight shape to form a cylindrical cable bundle, (2) winding a wrapping film as a restraining member, which restrains the cable bundle, around an outer circumferential portion of the cable bundle, (3) winding a wrapping film as a closing member which closes openings on both ends of the cable bundle, and (4) housing the cable bundle being wound with the restraining member and the closing member in a housing container.
    Type: Application
    Filed: April 28, 2014
    Publication date: August 21, 2014
    Applicants: Furukawa Electric Co., Ltd., Nippon Telegraph and Telephone Corp.
    Inventors: Tetsuya YASUTOMI, Masayoshi TSUKAMOTO, Noboru OKADA, Shigeo KIMURA, Shigeo KIHARA, Keiichiro SUGIMOTO, Shinichi NIWA
  • Patent number: 8260139
    Abstract: Conventional dispersion compensators were not sufficient to satisfy a demand to set a different dispersion value for each WDM wavelength in a ring-mesh type network that utilizes wavelength selective switches or the like. The devices were insufficiently reduced in size and power consumption and used with difficulty to change dispersion characteristics for each wavelength flexibly in a simple manner. A dispersion compensator of the present invention uses general-purpose optical components including a spatial light modulator for providing discrete phases to set appropriately the relationship between the focusing beam radius and the spatial light modulator pixel, thereby providing various dispersion compensation characteristics.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: September 4, 2012
    Assignee: Nippon Telegraph & Telephone Corp.
    Inventors: Kenya Suzuki, Kazunori Seno, Naoki Ooba, Shinji Mino, Motohaya Ishii
  • Publication number: 20120173234
    Abstract: The processing efficiency and estimation accuracy of a voice activity detection apparatus are improved. An acoustic signal analyzer receives a digital acoustic signal containing a speech signal and a noise signal, generates a non-speech GMM and a speech GMM adapted to a noise environment, by using a silence GMM and a clean-speech GMM in each frame of the digital acoustic signal, and calculates the output probabilities of dominant Gaussian distributions of the GMMs. A speech state probability to non-speech state probability ratio calculator calculates a speech state probability to non-speech state probability ratio based on a state transition model of a speech state and a non-speech state, by using the output probabilities; and a voice activity detection unit judges, from the speech state probability to non-speech state probability ratio, whether the acoustic signal in the frame is in the speech state or in the non-speech state and outputs only the acoustic signal in the speech state.
    Type: Application
    Filed: July 15, 2010
    Publication date: July 5, 2012
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Masakiyo Fujimoto, Tomohiro Nakatani
  • Publication number: 20120114168
    Abstract: A digital watermark embedding apparatus for embedding embedding information into an input signal having dimensions equal to or greater than N(N is an integer equal to or greater than 2). The apparatus generates an embedding sequence based on the embedding information, generates an N?1-dimensional pattern based on the embedding sequence, generates an N-dimensional embedding pattern by modulating a periodic signal according to a value on the N?1-dimensional pattern, and superimposes the embedding pattern in the input signal and outputs it. A digital watermark detection apparatus measures a component of a predetermined periodic signal in a direction of a dimension of the input signal to obtain an N?1-dimensional pattern, obtains a detection sequence from values of the N?1 dimensional pattern, and detects the embedded digital watermark based on a size of correlation value between the detection sequence and an embedding sequence.
    Type: Application
    Filed: November 22, 2011
    Publication date: May 10, 2012
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Susumu YAMAMOTO, Takao NAKAMURA
  • Publication number: 20120084235
    Abstract: A structured prediction model learning apparatus, method, program, and recording medium maintain prediction performance with a smaller amount of memory. An auxiliary model is introduced by defining the auxiliary model parameter set ?(k) with a log-linear model. A set ? of auxiliary model parameter sets which minimizes the Bregman divergence between the auxiliary model and a reference function indicating the degree of pseudo accuracy is estimated by using unsupervised data. A base-model parameter set ? which minimizes an empirical risk function defined beforehand is estimated by using supervised data and the set ? of auxiliary model parameter sets.
    Type: Application
    Filed: September 30, 2010
    Publication date: April 5, 2012
    Applicants: MASSACHUSETTS INSTITUTE OF TECHNOLOGY, NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Jun Suzuki, Michael J. Collins
  • Publication number: 20120070032
    Abstract: A digital watermark embedding apparatus for embedding embedding information, as digital watermark, into an input signal having dimensions equal to or greater than N (N is an integer equal to or greater than 2) and a digital watermark detection apparatus for detecting the digital watermark are disclosed. The digital watermark embedding apparatus generates an embedding sequence based on embedding information, generates a N?1-dimensional pattern based on the embedding sequence, generates N-dimensional embedding pattern by modulating a periodic signal according to a value on the N?1-dimensional pattern, and superimposing the embedding pattern in the input signal and outputs it.
    Type: Application
    Filed: November 22, 2011
    Publication date: March 22, 2012
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Susumu YAMAMOTO, Takao Nakamura
  • Publication number: 20120053949
    Abstract: There is provided a coding technique capable of reducing the amount of computation in coding while maintaining the efficiency of the coding. The technique uses an input signal and one of a decoded signal decoded from a first code obtained by encoding the input signal and a decoded signal obtained during generation of the first code. A gain group set includes one or more gain groups including different numbers of values corresponding to gains. A gain group is allocated to each sample by using a predetermined method. The sample is multiplied by a gain identified by a value corresponding to each gain in the allocated gain group and a gain code indicating a gain that results in the smallest difference between the product and the input signal is output.
    Type: Application
    Filed: May 28, 2010
    Publication date: March 1, 2012
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Shigeaki Sasaki, Kimitaka Tsutsumi, Masahiro Fukui, Yusuke Hiwasaki
  • Publication number: 20120045056
    Abstract: It is aimed to implement a hierarchical predicate encryption (HPE) scheme. A cryptographic process is performed using dual vector spaces (dual distortion vector spaces (DDVS)) of a space V and a space V* paired through a pairing operation. An encryption device generates as a cipher vector a vector in the space V, the vector having transmission information embedded therein. A decryption device, using a predetermined vector in the space V* as a key vector, performs the pairing operation on the cipher vector generated by the encryption device and the key vector, to decrypt the cipher vector and to extract information concerning the transmission information.
    Type: Application
    Filed: April 14, 2010
    Publication date: February 23, 2012
    Applicants: Nippon Telegraph and Telephone Corp., Mitsubishi Electric Corporation
    Inventors: Katsuyuki Takashima, Tatsuaki Okamoto
  • Publication number: 20120027206
    Abstract: Hierarchical cryptography expressed in a general semiordered structure other than a tree structure is implemented. In information generation, random numbers ?v and (?vj)j?w(v)?Zq are generated; main information kv=?v?i?{1, . . . , N-1}\w(v)vibi*+bN* is calculated; and derivation information kvj=?vj?i?{1, . . . , N-1}\w(v)vibi*+bj* is calculated for each j?w(v). In information derivation, random numbers ?u and (?uj)j?w(u)?Zq are generated; main information ku=?u?i?w(v)\w(u)uikvi+kv is calculated; and derivation information kuj=?uj?i?w(v)\w(u)uikvi+kvj is calculated for each j?w(v).
    Type: Application
    Filed: April 23, 2010
    Publication date: February 2, 2012
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Koutarou Suzuki, Ryo Nishimaki
  • Publication number: 20120027210
    Abstract: A cryptographic communication technology that is based on predicate encryption and that can operate flexibly is provided. A conversion rule information pair is determined in advance, which has attribute conversion rule information prescribing a conversion rule for converting attribute designation information to attribute information used in a predicate encryption algorithm and predicate conversion rule information prescribing a conversion rule for converting predicate designation information to predicate information used in the predicate encryption algorithm. One kind of conversion rule information included in the conversion rule information pair is used to obtain first attribute information or first predicate information from input information. The first attribute information or the first predicate information is used for encryption.
    Type: Application
    Filed: April 23, 2010
    Publication date: February 2, 2012
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Kaku Takeuchi, Tetsutaro Kobayashi, Sakae Chikara
  • Publication number: 20120027201
    Abstract: Security against CCA is improved without providing space for just improving the security against CCA in a ciphertext space. In encryption processing, a first ciphertext C1 is calculated from a plaintext M and a symmetric key K; a value containing a value corresponding to the symmetric key K and a value corresponding to the first ciphertext C1 is put into a collision-resistant function H to calculate a function value of the function H; and r corresponding to the function value is used to calculate second ciphertext C2=r·(??=1nv?·b?)+?·bn+1?G1n+1. In decryption processing, the second ciphertext C2?G1n+1 and key information D1*=?·(??=1nw?·b?*)+bn+1*?G2n+1 are put into a bilinear function e to calculate a function value S˜=e(C2, D1*)?GT; a value corresponding to the function value S˜ and the first ciphertext C1 are put into the collision-resistant function H to calculate a function value of the function H; and it is judged whether r˜ corresponding to the function value satisfies C2=r˜·(??=1nv?·b?)+?˜·bn+1?G1n+1.
    Type: Application
    Filed: April 23, 2010
    Publication date: February 2, 2012
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Eiichiro Fujisaki, Koutarou Suzuki
  • Publication number: 20110274165
    Abstract: Provided that a first segment is an earliest time segment included in a discrete time segment, and a second segment is a time segment subsequent to the first segment, a positive second-segment parameter that corresponds to a weakly monotonically increasing function value of an average amplitude of prediction residuals in a time segment including the second segment is used as a parameter for variable length coding of prediction residuals in the second segment. In addition, a value that corresponds to a weakly monotonically increasing function value of the sum of the second-segment parameter and a positive additional value that corresponds to an index representing the prediction effectiveness of time-series signals in the time segment including the second segment is used as a parameter for variable length coding of the prediction residual at a certain discrete time in the first segment.
    Type: Application
    Filed: January 22, 2010
    Publication date: November 10, 2011
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Takehiro Moriya, Noboru Harada, Yutaka Kamamoto
  • Publication number: 20110273443
    Abstract: A method and a system for three-dimensional modeling of a three-dimensional scene features, are described. According to the present invention, a reference-image is captured from a known angle while an array of two-dimensional random patterns is projected onto a reference surface from another known angle. The reference image is turned in relation to the reference surface. Then, an image of the scene is captured while the array of two-dimensional random patterns is projected onto it from the same angles. By matching the patterns of these images and measuring the movement between the two projected patterns, the third dimension is computed using triangulation techniques.
    Type: Application
    Filed: August 12, 2009
    Publication date: November 10, 2011
    Applicants: NIPPON TELEGRAPH AND TELEPHONE CORP., FURUKAEA ELECTRIC CO., LTD.
    Inventors: Maurice Moshe Ernst, Alexander Faifman
  • Publication number: 20110254713
    Abstract: Information that includes first information identifying integer quotients obtained by divisions using prediction residuals or integers not smaller than 0 that increase monotonically with increases in the amplitude of the prediction residuals, as dividends, and a separation parameter decided for a time segment corresponding to the prediction residuals or a mapped integer value of the separation parameter, as a modulus, and second information identifying the remainders obtained when the dividends are divided by the modulus is generated as a code corresponding to the prediction residuals, and each piece of side information that includes the separation parameter is subjected to variable length coding.
    Type: Application
    Filed: December 8, 2009
    Publication date: October 20, 2011
    Applicant: Nippon Telegraph and Telephone Corp.
    Inventors: Takehiro Moriya, Noboru Harada, Yutaka Kamamoto
  • Publication number: 20110185171
    Abstract: A terminal device 4 transmits a certificate issue request including a communication ID thereof and a sub ID to a certificate issuing device 7 via a NW1. The certificate issuing device 7 inquires of a communication ID checking device 5 whether or not the communication ID included in the certificate issue request is in use or not and inquires of a communication ID/sub ID checking device 6 whether or not the communication ID and the sub ID are associated with each other. If both the check results are OK, the certificate issuing device 7 generates a certificate including the ID of the certificate issuing device 7, the communication ID, the sub ID and a validity period and transmits the certificate to the terminal device 4. In this way, a certificate with a short validity period can be issued only based on the access to the NW1 using the communication ID and the sub ID.
    Type: Application
    Filed: February 7, 2008
    Publication date: July 28, 2011
    Applicant: Nippon Telegraph and Telephone Corp.
    Inventors: Kei Karasawa, Masahisa Kawashima, Yukio Tsuruoka, Kenji Takahashi, Shingo Orihara
  • Publication number: 20110122948
    Abstract: A video signal generation apparatus for decoding a bit stream to generate a video signal, includes: a writing unit configured to write a flag value indicating whether a decoding target block has been coded by intra-coding or inter-coding in a specified bit position on one bit plane having a size the same as that of the decoding target block, to write information indicating a coding division form of the decoding target block in a specified common area on the one bit plane, and to write the coding information in a specified switch interpretation area on the one bit plane according to a data format conforming to the intra-coding if the decoding target block has been coded by intra-coding, and to write the coding information in the specified switch interpretation area according to a data format conforming to the inter-coding if the decoding target block has been coded by inter-coding; and a generation unit configured to generate a video signal by superimposing the one bit plane on a decoded image of the decoding
    Type: Application
    Filed: August 27, 2008
    Publication date: May 26, 2011
    Applicant: Nippon Telegraph and Telephone Corp.
    Inventors: Atsushi Sagata, Mitsuo Ikeda, Hiroaki Matsuda, Jirou Naganuma
  • Publication number: 20110074227
    Abstract: An acceleration generator 20 includes: a moving member (21, 25) that performs a periodic translational motion along a particular straight line; a first operating part (24) that applies a first force that varies in magnitude depending on the relative position thereof with respect to the moving member to the moving member in a direction parallel to the particular straight line; and a second operating part (27) that applies a second force that varies in magnitude depending on the relative position thereof with respect to the moving member to the moving member in a direction parallel to the particular straight line. The moving member performs a translational motion in which the acceleration thereof in the positive direction and the acceleration thereof in the negative direction are asymmetric in one period.
    Type: Application
    Filed: December 10, 2010
    Publication date: March 31, 2011
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.
    Inventors: Tomohiro Amemiya, Hideyuki Andou, Tarou Maeda
  • Publication number: 20110061098
    Abstract: For enabling single sign-on among applications, a linkage ID indicating connection between the authentication apparatus 1 including the client function and the server apparatus 2 is shared among a plurality of applications. For that, a SV information management unit Aa of the authentication apparatus 1 having the client function manages the linkage ID by storing it in a predetermined storing unit. An AP information management unit Ab manages and stores connection information between applications in a predetermined storing unit, wherein the connection information includes an application name corresponding to an application. Then, an AP decision unit determines whether an application name included in a received linkage ID request is registered in the AP information management unit Ab, obtains the linkage ID from the SV information management unit Aa when the application name is registered in the AP information management unit Ab, and returns the linkage ID to a source of the linkage ID request.
    Type: Application
    Filed: February 28, 2008
    Publication date: March 10, 2011
    Applicants: Nippon Telegraph and Telephone Corp., Nippon Hoso Kyokai
    Inventors: Yuko Konya, Masahito Kawamori, Tomokazu Yamada, Katsuhiko Kawazoe, Kiyohiko Ishikawa, Arisa Fujii, Syunji Sunasaki, Ganji Eto, Koichi Ishikawa
  • Publication number: 20110044462
    Abstract: The initial values of parameter estimates are set, including reverberation parameter estimates, which includes a regression coefficient used in a linear convolutional operation for calculating an estimated value of reverberation included in an observed signal, source parameter estimates, which includes estimated values of a linear prediction coefficient and a prediction residual power that identify the power spectrum of a source signal, and noise parameter estimates, which include noise power spectrum estimates. Then, the maximum likelihood estimation is used to alternately repeat processing for updating at least one of the reverberation parameter estimates and the noise parameter estimates and processing for updating the source parameter estimates until a predetermined termination condition is satisfied.
    Type: Application
    Filed: March 5, 2009
    Publication date: February 24, 2011
    Applicant: Nippon Telegraph and Telephone Corp.
    Inventors: Takuya Yoshioka, Tomohiro Nakatani, Masato Miyoshi