Nippon Telegraph and Telephone Corporation

Ntt Corporation

Takahiro Yamaguchi

Yasuhiro Mochida

Takayuki Nakachi

Daisuke Shirai

Yoshihide Tonomura

Takuro Yamaguchi

Tatsuya Fujii

Masanori Ogawara

Takafumi Tanaka

Tetsuro Inui

Toru Mano

Yukio Tsukishima

Junki Ichikawa

Tomoya Hibi

Katsuhiro Shimano

Yitu Wang

Tsuyoshi Ogura

Masahiko Kitamura

Hiroyuki Ishihara

Sotaro Maejima

A transmission system includes a calculation unit that calculates a jitter pattern sequence of a plurality of packets transmitted by a transmission device via a network using a transmission interval of the plurality of packets and a difference between arrival times at which the packets arrive at a reception device, a generation unit that inputs the jitter pattern sequence to a first learning model to generate a state index indicating a state of the network, and a buffer estimation unit that determines a buffer size of a reception buffer of the reception device based on the state index.

Transmission system, transmission method and transmission program

A video transmission system includes a video transmitter for storing a packet of video data in a transmitting buffer and transmitting the packet stored in the transmitting buffer, a video receiver for receiving the packet, and an estimation unit for estimating a characteristic of a transmission line between the video transmitter and the video receiver from an arrival time of each packet in the video receiver. The video transmitter transmits a packet at a timing specified from an inverse characteristic of a characteristic of the transmission line.

Video transmission system, video transmission method and video transmitter

An object of the present disclosure is to provide a data communication system, a computing apparatus, a data communication method, and a program, which are capable of highly reliable data transfer with low latency between computing apparatuses. The present disclosure achieves a highly reliable communication path by directly connecting computing apparatuses via an optical path and transmitting data through the optical path. Further, the present disclosure uses the optical path to achieve RDAM over wavelength transmission in which existing RDMA-enabled protocol stacks such as InfiniBand and TCP/IP/Ether are eliminated. The present disclosure eliminates the protocol stacks, enabling transfer with lower latency than in a case of 'simply performing RDMA transmission over the wavelength path'.

Data communication system, computer, data communication method, and program

An abnormality detection device according to the present invention is a video transmission state abnormality detection device connected via a network to a plurality of video transmission devices, an IP packet transfer device on the transmission side, an IP packet transfer device on the reception side, and a plurality of video reception devices. The video transmission state abnormality detection device prepares a transmission/reception IP flow table by aggregating IP flow information for the devices, detects an abnormality in transmission on the basis of the transmission/reception IP flow table, and specifies the location of the abnormality. The abnormality detection device according to the present invention can automatically detect the amount of traffic and specify which part of a transmission path an abnormality is caused on, without the need for advance setting. Therefore, video or sound traffic can be monitored efficiently.

Anomaly detection device, anomaly detection method, and program

The present disclosure is directed to enabling acquisition of information of an argument corresponding to a case. The present disclosure is a language processing apparatus which refers to an argument emergence history databasewhich stores argument emergence patterns associated with cases and arguments of verbs for each meaning of a word or usage of a verb, acquires an argument emergence pattern which matches a verb and a case of the verb included in a request from a user from the argument emergence history database, and generates a response to the user using an argument included in the argument emergence pattern acquired from the argument emergence history database

Language processor, language processing method and language processing program

The present disclosure has an object of proposing a method and a device for estimating the state of a transmission path or an optical transmitter capable of mechanically estimating a factor causing an error with a small amount of constellation data and a low computing amount. The present disclosure provides a device for estimating a state of optical communication, the device including: a data preprocessing unit that reduces the number of data using random sampling with respect to constellation data in which an amplitude and a phase of optical communication data are represented by a polar coordinate diagram and performs distribution calculation and a dimension reduction; a learning unit that learns a dictionary matrix in sparse coding using learning constellation data processed by the data preprocessing unit; and a recognition unit that calculates a sparse coefficient using recognition constellation data processed by the data preprocessing unit and the dictionary matrix learned by the learning unit and estimates a factor causing degradation of the optical communication using the calculated sparse coefficient.

Method, device and program for estimating optical communication status

A time synchronization device focuses on a possibility of multiplexing a plurality of PTP domains on a transmission line with the same PTP and derives one time based on time information from a plurality of PTP domains. The time synchronization device includes PTP slave units belonging to corresponding PTP domains different from each other and configured to synchronize with times of the corresponding PTP domains, and a time integration unitconfigured to use time information that is a time after the PTP slave unit synchronizes with the time of a master device belonging to the corresponding PTP domain and synchronization accuracy information that is an accuracy of synchronization of the PTP slave unit with the time of the master device to generate one integrated time.

Time sync device, time sync method, and program

The present disclosure is intended to enable playback of media data corresponding to a sensibility effect set in advance. A content playback device () of the present disclosure includes: a device table production unit () holding a device table in which a format of media data that can be played back and a device parameter are determined for each device; a media table production unit () configured to acquire metadata including the format and a sensibility effect label of the media data, determine a mapping evaluation scale that is a device parameter corresponding to the sensibility effect label, and produce a media table in which the mapping evaluation scale and the format are determined for each media data; and a mapping determination unit () configured to extract, based on the formats, a combination pattern of a device on which media data can be played back and the media data, select, from among extracted combination patterns, a combination pattern for which a relative error between the device parameter and the mapping evaluation scale is minimum, and select a device that is an output destination of the media data.

Content playback device, content playback method and content playback program

A video audio transmission system, transmission method, sending device, and reception device capable of avoiding buffer overflow and buffer depletion in a decoding device and realizing Group of Pictures (GOP) synchronization in encoding devices by eliminating clock deviation among devices. In the video audio transmission system, the sending devices supply clocks generated from common time point information to cameras as genlock signals. The reception devices supply clocks generated from the common time point information to the decoding devices as genlock signals. Therefore, clock deviation between the devices can be eliminated, and the buffer overflow and the buffer depletion in the decoding device can be avoided. Frame periods of video signals output by a plurality of dispersed cameras can be aligned, and reliable GOP synchronization can be realized by the encoding devices on a latter stage with respect to the cameras.

Video/audio transmission system, transmission method, transmission device, and reception device

An objective of the present disclosure is to enable estimation of an attention target of communication parties even if there are a plurality of objects having the same appearance in a space. An attention target estimation deviceaccording to the present disclosure acquires a first-person point-of-view video IMcaptured from a perspective of a person and a line-of-sight position gof a person when the first-person point-of-view video IMis captured, identifies positions in a 3D space of objects, andextracted from the first-person point-of-view video IM, and determines an object close to the line-of-sight position gof the person among the objects, andincluded in the first-person point-of-view video IMas the attention target of the person.

Attention target estimating device, and attention target estimating method

The present disclosure aims to provide a method for detecting a GOP boundary of an encoded bit stream of each layer and associating GOPs of the layers for hierarchical transmission in a video transmission device that transmits a hierarchically encoded bit stream. The present disclosure provides a video transmission device and a video transmission method that detect a GOP head access unit in a base layer of a hierarchically encoded bit stream by analyzing the base layer and detect a head access unit of an enhancement layer of an identical GOP to that of the aforementioned access unit from a decoding time stamp of the access unit by using the relationship between a decoding time stamp of the base layer and a decoding time stamp of the enhancement layer.

Video transmission device and video transmission method

A selective PEG algorithm, creating a sparse matrix while maintaining row weight/column weight at arbitrary multi-levels, and in the process, inactivating an arbitrary edge so that a minimum loop formed between arbitrary nodes is enlarged or performing constrained interleaving, so that encoding efficiency in the case where a matrix space is narrow is improved.

Sparse graph creation device and sparse graph creation method

This method and device makes it possible to implement maximum likelihood decoding of a sparse graph code at low computational complexity in the maximum likelihood decoding of the sparse graph code. This is, in the maximum likelihood of decoding of the sparse graph code, a lost data decoding process by a trivial decoding method and a lost data decoding process by a Gauss elimination method are performed repeatedly and alternately.

Growing community of inventors

Musashino, Japan

Takahiro Yamaguchi