Nippon Telegraph and Telephone Corporation

Toshimitsu Tsubaki

Naoki Higo

Kojun Koshiji

Yoshiko Sueda

Takeshi Kuwahara

Takuma Tsubaki

Masanao Nakano

Tatsuya Ishihara

Ryota Ishibashi

Masao Aihara

Hiroyuki Fukumoto

Yosuke Fujino

Hitoshi Hayashi

Yuki Yano

Masashi Shimizu

Marina Nakano

Takao Kurahashi

Miharu Oiwa

Yuya Ito

An aspect of the present invention is a Doppler compensation system including: a sound wave receiving element that receives a sound wave transmitted by a transmitter; a ground-speed-related quantity acquisition unit that acquires a ground-speed-related quantity that is a physical quantity related to a vector representing a ground speed of a receiver including the sound wave receiving element based on an acceleration of the receiver; an extraction unit that extracts a sound wave including an estimation target sound wave that is a sound wave to be estimated from among sound waves received by the receiver; an arrival direction estimation unit that estimates an arrival direction of the estimation target sound wave based on the estimation target sound wave; a reception-direction-speed-related quantity estimation unit that estimates a quantity related to a speed in a reception direction that is a direction in which the estimation target sound wave viewed from the receiver arrives based on the ground-speed-related quantity and a result of the estimation from the arrival direction estimation unit; and a Doppler compensation unit that compensates for waveform distortion due to Doppler effect of the estimation target sound wave based on a result of the estimation from the reception-direction-speed-related quantity estimation unit.

Doppler compensation system and doppler compensation method

A message relay apparatus and a message relay method that achieve high message reachability taking communication network situation into consideration are provided. A message relay apparatusinterposed between an applicationand a deviceincludes a device communication state determination functional unitthat determines communication availability with the device, a network state estimation unitthat estimates a network state based on the communication availability, and a message processing unitthat determines forwarding availability of an application message based on the network state and buffers the application message when forwarding is not available.

Message relay apparatus and method

A data transmission apparatus causes a computer to receive first data and second data, each of which has a different transmission destination, evaluate relevance between the first data and the second data, and transmit the first data and the second data to the respective transmission destinations, and the transmitting of the data further includes transmitting the first data to the transmission destination of the second data in accordance with evaluation results obtained in the evaluating of the relation, so that a diversity of the data that can be collected by the transmission destination of the data is increased.

Data transmission method, data transmission apparatus and program

A video management device includes a storage processing unit configured to store video data received through a network in a storage unit, a calculation unit configured to classify a video data group stored in the storage unit based on combinations of imaging locations and content of video data, and to calculate a frequency of appearance of each of the combinations, and a selection unit configured to select video data to be deleted from the storage unit based on the frequency of appearance, thereby increasing a possibility that the deletion of a high-value video will be avoided.

Video management apparatus, video management method and program

Provided is a virtual world construction system that does not impair consistency between virtual worlds and places only small loads on terminals. A client applicationthat is implemented on a user terminal, a plurality of server applicationsthat are implemented on servers, and a proxythat is located on a communication path between the user terminal and the servers and relays operation information and video information are provided. The proxyincludes a motion duplication unitthat transmits operation information to the plurality of servers by duplicating the operation information, and a video integration/rendering control unitthat transmits timing information regarding rendering timing to the plurality of servers, and transmits video information received from at least one of the servers, to the user terminals. A rendering processing unit/video processing unitof each of the servers performs rendering processing and video information transmission processing based on the timing information received from the proxy

Virtual world construction system and method

Communication quality is improved by performing, with a computer, determining whether redundancy of a communication path is necessary or not and a compression level of data based on communication quality associated with transfer of the data; compressing data to be transferred in accordance with the compression level determined; and a transmission step of, when it is determined that redundancy of the communication path is necessary, making the communication path redundant and transmitting the data to each of the resulting communication paths.

Data transfer method, data transfer device and program

An information delivery technique for, at the time of delivery of area information via a network, delivering area information about a destination before a device arrives at the destination is disclosed. One aspect of the present disclosure is an information delivery apparatus including a delivery information management function unit configured to manage area information to be delivered, a destination management function unit configured to manage a destination of a device, and a communication function unit configured to deliver the area information to the device, wherein the destination management function unit determines the destination of the device using movement information about the device, and the communication function unit delivers area information about the destination to the device before the device moves to the destination.

Information delivery apparatus, information delivery method and program

A time providing method includes: by a computer, upon receiving data from a device, estimating a generation time of the data using a reception time of the data and a first delay time of the device previously estimated; providing information indicating the generation time to the data; and transmitting the data provided with the information indicating the generation time to a destination of the data.

Time stamping method, time stamping apparatus and program

A video management apparatus includes a storage processing unit configured to store, in a storage unit, video data received through a network, a determination unit configured to determine whether or not video data groups stored in the storage unit are analyzed based on a first period of time indicating a period of time until a free capacity becomes insufficient in the storage unit and a second period of time indicating a maximum analysis time required for analysis of the video data groups, a first calculation unit configured to analyze the video data groups to calculate a predetermined statistic in a case where it is determined that the video data groups are analyzed, and a deletion unit configured to delete the analyzed video data groups.

In one aspect of the present invention, a transfer apparatus includes a reception unit configured to receive a packet from a source which distributes data according to a transmission control protocol (TCP); a storage unit configured to store data included in the received packet in a buffer based on a TCP sequence number of the received packet; a TCP transfer unit configured to transfer the received packet to a first sink which requests distribution according to the TCP; and a UDP transfer unit configured to read the data from the buffer and transfer the read data to a second sink which requests distribution according to a user datagram protocol (UDP).

Transfer apparatus, transfer method, and program for transporting data from a single source to sinks with different communication requirements

A data distribution system including a source configured to distribute data and a sink configured to process the distributed data includes a marker configured to receive a packet distributed by the source, add supplementary information to the received packet based on information obtained from a header of the packet, and transfer the packet; and a filter configured to receive the packet transferred by the marker, determine whether the received packet can be transferred to the sink based on the supplementary information added to the packet, transfer the packet to the sink if the packet can be transferred to the sink.

Data distribution system, data distribution method, marker, filter and program

A communication method for a noncontact RF ID system that uses a first waveform, a second waveform, and a third waveform, wherein the first waveform and the second waveform are formed by a basic waveform having one of a rising or falling state transition at the approximate center of the waveform, the third waveform is formed by a plurality of basic waveforms that have one state transition at the approximate center part of the waveform, and the third waveform generates one state transition only at the approximate center of the plurality of basic waveforms. In addition, communication is carried out by using the third waveform in place of the first waveform and the second waveform in the case in which communication is carried out using a first waveform and a second waveform and one state transition is generated outside the approximate center part of the basic waveform.

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Yokohama, Japan

Toshimitsu Tsubaki