Sony Corporation

Nippon Telegraph and Telephone Corporation

Ricoh Company, Ltd.

Fuji Photo Film Company, Limited

Nippon Kayaku Kabushiki Kaisha

Nec Corporation

Kabushiki Kaisha Toshiba

Cellseed, Inc.

Akira Masuda

Shuto Yamamoto

Yoshiaki Kisaka

Tetsuro Kutsuwada

Takeshi Fujita

Kohichi Nishide

Hiroki Taniguchi

Masanori Nakamura

Seiji Okamoto

Mitsunori Fukutoku

Seiichi Saito

Yoshiaki Sone

Fukutaro Hamaoka

Hiroaki Kobayashi

Ryuji Suzuki

Takayuki Inoue

Teruo Okano

Yohei Fujita

Kunio Hakkaku

Tadashi Kitai

Kimiaki Nakada

Takahiro Koyama

Yoshiaki Nakayama

Hiroshi Ushiki

Kengo Horikoshi

Isao Matsumoto

Masayuki Yamato

Asuka Matsushita

Keiichirou Yamamoto

Nobuyoshi Shimada

Masayuki Kitagawa

Hajime Kubota

Hiroo Hoshino

Hiroya Uruta

Koji Shimanuki

Toshikatsu Harase

Akihiko Kikuchi

Yasuharu Yanamura

Hideharu Fujiyama

Susumu Tomoda

Takeshi Onda

Yoshitaka Abe

Tamihei Hiramatsu

Daisuke Masui

Kengo Yamamoto

Satoshi Morita

Kazutoshi Takashio

Masanobu Suzuki

Shigeki Wakatani

Yukihiro Nishiyama

Jun-ichi Seki

Takaaki Nishikiori

Tomio Morino

Yohta Mashiko

Kan Saiga

Toshiharu Iida

Ken Yamakawa

Shinji Odagiri

Tetsuaki Iwasaki

Yusuke Kawatsu

Tetsuzo Kano

Taiji Kitami

Masakazu Nishimoto

Yoshitaka Satoh

Hiroko Mashiba

Yoshiko Matsushita

Satosi Morita

Sinji Odagiri

Eiji Kawano

Masatoshi Yamada

Mituyuki Nishide

Yuji Akiyama

Chisato Tomiyama

Eriko Toyoda

Yasushi Yoneta

Yuichi Akatsu

Ayaka Mochizuki

Masato Suwa

Eriko; Toyoda

A fault detection apparatus includes: a transmitter that transmits a first optical signal through an optical transmission line; a receiver that receives, in response to the transmission of the first optical signal, a second optical signal from the line, and measures the reception level of the second optical signal; and a control unit that specifies a section where the second optical signal corresponding to the first optical signal was generated, calculates an optical level corresponding to a loss in said section on the basis of the reception level, determines that a first fault has occurred in the section when the optical level in the section has changed from a first reference level by a first threshold or more, sets a second reference level and a second threshold after occurrence of the first fault, and determines occurrence of a second fault.

Fault detection apparatus, fault detection method, and submarine cable system

An object is to provide an optical transceiver in which two single-core bidirectional optical communication devices are mounted on a single substrate. A first substrate includes an electric connector connected to an optical transmission apparatus, and a signal processing circuit processing electric signals that are input to and output from first and second optical transceiver modules. Components outputting a control signal to the signal processing circuit is mountd on a second substrate. A flexible printed circuit connects the first substrate to the first and second optical transceiver modules.

Optical transceiver

A device generates a symbol sequence by performing adaptive equalization by an estimation inverse transfer function of a transmission line on a reception signal sequence extracted from the transmission line, and performing provisional determination on the symbol sequence generated; generates a plurality of the symbol sequences indicating transmission line states in a range of a provisional determination symbol provisionally determined and nearby symbols of the provisional determination symbol; generates, based on the plurality of the symbol sequences indicating the transmission line states generated and an estimation transfer function of the transmission line, an estimation reception symbol sequence for each of the transmission line states; calculates a metric between the symbol sequence obtained from the reception signal sequence and each of a plurality of the estimation reception symbol sequences; selects a most likelihood estimation reception symbol sequence of the plurality of the estimation reception symbol sequences, based on the calculated metric, the provisional determination symbol, and the nearby symbols of the provisional determination symbol; and determines a transmission symbol sequence.

Symbol judgement apparatus and symbol judgement method

An information processing apparatus includes circuitry. The circuitry is configured to acquire read image data of an image formed on a recording medium. The circuitry is configured to acquire output target image data according to which the image is formed. The circuitry is configured to generate, based on the output target image data, inspection image data for inspection of the read image data. The circuitry is configured to compare the read image data corrected based on an amount of deviation caused by conveyance of the recording medium with the inspection image data generated, to detect an image abnormality. The circuitry is configured to highlight and output a position of a portion of the image abnormality in the read image data before correction, based on the amount of deviation caused by conveyance of the recording medium, in response to the image abnormality being detected.

Information processing apparatus, output method, and non-transitory computer-readable storage medium which highlights an abnormality before correction

An optical transmission system including an optical transmitter and an optical receiver, wherein the optical transmitter includes a signal coding unit that performs non-linear block coding on an M (M is an integer greater than or equal to 1)-value symbol sequence or a bit sequence input as data information to generate an L (L is an integer greater than or equal to 2, L&#x3e;M)-value symbol sequence that corresponds to the M-value symbol sequence or the bit sequence in one-to-one correspondence, a digital-to-analog conversion unit that converts the generated L-value symbol sequence to an analog signal, and a modulator that generates an optical modulation signal by performing modulation based on the analog signal, and the optical receiver includes a light receiving unit that receives the optical modulation signal transmitted from the optical transmitter and converts the optical modulation signal to an electrical signal, and a signal decoding unit that restores the M-value symbol sequence or the bit sequence by performing processing that is the reverse of processing performed by the signal coding unit, on the electrical signal.

Optical transmission system

Provided is an optical transmission system that includes an optical transmitter, and an optical receiver. The optical transmitter includes: a signal coding unit configured to perform nonlinear trellis coding, which corresponds to nonlinear calculation, on a symbol sequence; and a modulator configured to modulate the symbol sequence subjected to the nonlinear trellis coding by the signal coding unit, and transmit the modulated symbol sequence to the optical receiver. The optical receiver includes: a light receiving unit configured to receive an optical signal transmitted from the optical transmitter, and convert the received optical signal into an electrical signal; and a digital signal processing unit configured to perform digital signal processing on the electrical signal to reconstruct the symbol sequence.

There are provided an optical transmission apparatus that subjects a transmission signal including a plurality of sequences to Hadamard transform to obtain a signal in which a predetermined delay is added to one of the sequences, optically modulates the obtained signal, and transmits the modulated signal, and an optical reception apparatus that demodulates a reception signal received from the optical transmission apparatus by subjecting the reception signal to adaptive equalization processing with a predetermined number of taps. The optical reception apparatus includes: an adaptive equalization processing unit that subjects the reception signal to adaptive equalization processing of wavelength distortion compensation with a number of taps obtained by subtracting a number in accordance with the delay from the predetermined number of taps; a delay compensation unit that subjects the reception signal subjected to the wavelength distortion compensation to delay compensation in accordance with the delay; and an inverse Hadamard transform unit that subjects the reception signal subjected to the delay compensation to inverse Hadamard transform.

Optical transmission system, optical receiving apparatus and optical transmission method

A symbol-determining device according to an embodiment includes: a transmission line shortening unit that multiplies each symbol value of a symbol array that is part of an input signal by a tap gain of a linear digital filter and outputs a symbol array representing a sum of values acquired through the multiplication; a transmission line estimating unit that estimates a transfer function of a transmission line using an adaptive nonlinear digital filter on the basis of a symbol array representing a state of the transmission line; an addition comparison processing unit that calculates a minimum value of a distance function in a Viterbi algorithm on the basis of a metric that is calculated on the basis of the output of the transmission line shortening unit and the transfer function; and a path tracing-back determination unit that performs symbol determination by tracing back a trellis path in the Viterbi algorithm on the basis of the minimum value of the distance function.

Symbol-determining device and symbol determination method

A digital coherent receiver includes: an adaptive equalizer configured to execute, using a first tap coefficient, adaptive equalization processing on a digital signal that corresponds to a signal; a first coefficient updating unit configured to update the first tap coefficient based on the digital signal on which the adaptive equalization processing has not been executed, the digital signal on which the adaptive equalization processing has been executed, and a first step size; a second coefficient updating unit configured to update a second tap coefficient based on the digital signal on which the adaptive equalization processing has not been executed, the digital signal on which the adaptive equalization processing has been executed, and a second step size; and a control unit configured to detect a fluctuation speed of a state of polarization of the digital signal based on the second tap coefficient, and change the first tap coefficient to the updated second tap coefficient if it is determined that the fluctuation speed is higher than or equal to a speed threshold.

Digital coherent receiver and digital coherent receiving method

An encoding device includes an encoding unit, DA converters, light sources, intensity modulators, and wavelength multiplexers. The encoding unit adds (NM/2) to an encoded signal having a negative minimum value in a range of the encoded signal among encoded signals of N channels of (NM+1) values obtained by calculating an inner product of a Hadamard matrix of N rows and N columns and a matrix having elements of N intensity signals of (M+1) values. The DA converters of the channels convert the encoded signals of the channels from digital signals into electrical analog signals. The light sources output light of wavelengths for use in the channels. The light intensity modulators of the channels intensity-modulate the light output from the light sources with the encoded signals converted into the electrical analog signals by the DA converters. The wavelength multiplexer outputs a wavelength-multiplexed signal obtained by wavelength-multiplexing the light intensity-modulated by the light intensity modulators.

Encoding device and decoding device

A physiologically active substance-conjugated block copolymer having enhanced efficacy and/or safety is provided by enhancing the property of penetrating into a target diseased tissue and/or enhancing excretability, compared to known physiologically active substance-conjugated block copolymer, and suppressing sensitization of the physiologically active substance to normal tissues other than a target diseased tissue. Disclosed is a block copolymer including a polyethylene glycol segment connected with a polyamino acid derivative segment conjugated with a physiologically active substance, in which the molecular weight of the block copolymer is from 2 kilodaltons to 15 kilodaltons, and the light scattering intensity of a 1 mg/mL aqueous solution of the physiologically active substance-conjugated block copolymer as measured with a laser light scattering photometer is at least twice or more the light scattering intensity of toluene.

Block copolymer conjugate of physiologically active substance

In an embodiment, provided is an image combining apparatus coupled to a first terminal device through a network. The image combining apparatus includes: a delivery section that delivers screen data that is image data for a screen to the first terminal device; a receiving section that receives first handwriting position information indicating a position of first handwriting information input to a screen based on the screen data on the first terminal device; a generation section that produces first handwriting image data that is the image data of the first handwriting information using the first handwriting position information; and a combining section that produces combined screen data by combining the screen data with the first handwriting image data.

Image combining apparatus, terminal device, and image combining system including the image combining apparatus and terminal device

An image distribution apparatus which is connected to multiple display apparatuses and which includes a distribution unit which distributes an image displayed in the display apparatuses is disclosed. The image distribution apparatus includes a specifying unit which designates an area of the image, wherein the distribution unit distributes information indicating an area designated by the specifying unit.

Image distribution apparatus, display apparatus, and image distribution system

An information processing system includes a first information processing apparatus that outputs a sound of a predetermined frequency; and a second information processing apparatus that collects the sound that is output from the first information processing apparatus, and outputs a response to the sound of the predetermined frequency to the first information processing apparatus. The first information processing apparatus transmits predetermined data to the second information processing apparatus that has output the response to the sound of the predetermined frequency.

Information processing system and information processing apparatus

Growing community of inventors

Tokyo, Japan

Akira Masuda