Nec Corporation

Rakuten Group, Inc.

Hiroaki Dei

Kazunori Ozawa

Daisuke Mizuno

Atsushi Hatabu

Kazuhiro Koyama

Kazuteru Watanabe

Ryota Takeshima

A cellular phone terminalcan be connected to both of a wireless cellular phone base stationthat is a public network and a wireless LAN access pintthat is a private wireless network to be used by particular users. When the cellular phone terminalenters a wireless areaof the private wireless network, the cellular phone terminalactivates at least one part of at least one data processing functions of an address book function, a bookmark functionand a mailbox functionthat handle private information for the cellular phone terminal. On the other hand, when the cellular phone terminalmoves outside the wireless LAN arealike a cellular phone terminal, at least one part of the function of the activated functions is non-activated or disabled. The activated/non-activated functions are differentiated depending on a plurality of the private wireless networks or the user of the cellular phone terminal.

Cellular phone system, cellular phone terminal, private information protection method, private information protection program and program recorded medium

There are provided a system, an apparatus, and a method for suppressing increase in an amount of distribution data when performing content distribution via a network, improving reliability of the data received by a receiver in the distribution through an unstable transmission path such as a wireless transmission path, enabling provision of the content with a stable quality, and realizing the provision of the content with an optimal quality for the reception environment of content receiver, while suppressing an increase in an amount of processing for improving reliability of the distribution data on both of reception side and a transmission side. A content distribution apparatusincludes first through Nth image encoded data transmitting unitsto, and multiplexes a plurality of data in a predetermined layer in accordance with a scalable encoding system using a plurality of sessions or a same session, for transmission by providing a preset time difference for each of the data or interleaving the data. The content distribution apparatussets compression rates of second and subsequent data to be the same or higher than that of first data, suited to a state of the transmission path, thereby suppressing an increase in a band. A content receiving apparatusincludes first through Nth image encoded data receiving unitsto, an encoded data reconstruction unit, and a decoder. The content receiving apparatusselects encoded data based on the compression rate, for reconstruction, and decodes the reconstructed encoded data.

Method, apparatus, system, and program for content encoding, content distribution, and content reception

A PTT server includes a controlling unit, a receiving unit, a medium converting unit, and a transmitting unit. The controlling unit controls pieces of connection setting information less than the number of a plurality of PTT terminals having different specifications by complying them with the plurality of PTT terminals. The receiving unit receives a medium coded data from any one of the PTT terminals. The medium converting unit converts the medium coded data with a converting method on the basis of the connection setting information compliant with a PTT terminal for transmission destination to produce an output coded data. The transmitting unit transmits the output coded data to the PTT terminal for the transmission destination.

PTT server, PTT communication system, PTT communication method, and program

In distributing moving image data, it is an object to make it possible to start reproduction, not only from the head of the moving image data, but also from any desired position and to minimize an increase in the amount of the processing. A moving image data conversion device () comprises moving image data receiving means () for receiving moving image data (), decoder configuration information saving means () for retrieving and holding decoder configuration information included in the moving image data () to define a condition for decoding the moving image data (), decoder configuration information inserting means () for inserting the decoder configuration information into a plurality of predetermined positions in the moving image data () to generate moving image data, and moving image data output means () for outputting the generated moving image data as moving image data ().

Moving image data conversion method, device, and program

A multipoint videoconference server is made to swiftly respond to a video switching request from a terminal and a degree of computational complexity is made lower. A serverdecodes only m (1&#x3c;m&#x2266;n) video streams selected from n terminals and stores video streams that need not be decoded in buffers. When an instruction to switch to another stream is received from a terminal, the serveruses data accumulated in the buffers and decodes from the latest I frame by going back to the past before starting to provide a video using the video stream.

Multipoint conference system, multipoint conference method, and program

Disclosed is a relay apparatus including a video buffer control unit that controls a video buffer according to a control instruction received by an instruction receiving unit, a threshold set by a threshold setting unit, and a timing set by a timing generation unit. The video buffer control unit controls the video buffer for each segment, according to a result of analysis by a segment interpretation unit.

Buffer control method, relay apparatus, and communication system

There are provided a content data transmission method, device, and program that minimize serious disturbances in reproduced content on the reception side, caused by a transmission error of encoded data, without sending feedback information from the reception side to the transmission side. When an encoder creates encoded data to be distributed, the encoder creates plural items of encoded data at the same time or creates FEC data at the same time in advance and, when storing the data in a file, stores the data as if the data were one item of encoded data. When a distribution server distributes the data using the file, the plurality of items of encoded data are automatically distributed at the same time and the FEC data is distributed. A client receives the plurality of items of encoded data or the FEC data to reduce the probability of data shortage due to a packet loss and, as a result, the deterioration in the image quality and the audio quality is reduced.

Content distribution method, encoding method, reception/reproduction method and apparatus, and program

A code conversion/transmission apparatus for being supplied with compressed encoded data and converting and outputting the data to a transmission path has code converter/transmitters for outputting the encoded data input thereto and encoded data produced by re-encoding the encoded data input thereto, or outputting a plurality of encoded data comprising encoded data produced by separately re-encoding the encoded data input thereto, respectively, and transmitting the plurality of encoded data to at least one transmission path. At least a portion of the encoded data input thereto and at least a portion of the re-encoded encoded data are transmitted to the transmission path.

Moving picture data code conversion/transmission method and device, code conversion/reception method and device

An image data communication system that enables a suppression of the loss of data during a handover interval without entailing insufficiency of network resources includes: image data distribution device for sequentially distributing, with prescribed time differences, encoded image dataandin which an identical image has been encoded; and image data reception device for receiving encoded image dataandthat have been distributed from image data distribution device while moving among a plurality of radio areas. Image data reception device, at the time of handover that occurs during movement from a current radio area to another neighboring radio area, receives over a prescribed interval encoded image dataandhaving prescribed time differences that are distributed from image data distribution device, and selects necessary data from the encoded image dataandthat have been received to reconstruct one set of encoded image data.

Image data communication system and image data communication method

A conversion server and a plurality of clients are connected via a transmission line. The conversion server that receives image coded data from the clients converts the image coding system in accordance with the coding system available to each client, the coding setting, and the status of the transmission line, and transmits the converted image coded data. For a client where the number of images that can be displayed is limited, the conversion server decodes a selected plurality items of image coded data, re-encodes the selected pieces into one composite image, and transmits the re-encoded image. The conversion server also comprises decoding processing units, one for each connected client, for decoding image coded data from each client. In response to a display image switching request from a client, the conversion server intraframe-codes the decoded image data of an image that will be used after the switching and transmits the intraframe-coded data. This enables an image to be switched quickly independently of the intraframe time of received image coded data that will be used after the switching.

Method, apparatus, system, and program for switching image coded data

A content distribution device includes data output means for outputting encoded data and transmission means for transmitting encoded data which is outputted from the data output means. The data output means outputs encoded data obtained by hierarchical encoding as the encoded data. The transmission means transmits at least a part of data of at least one layer among the encoded data obtained by the hierarchical encoding.

Content distribution/reception device, content transmission/reception method, and content distribution/reception program

A system and a method of suppressing outstanding degradation of decoded audio quality due to a transmission error of audio coded data are provided without feedback information from a receiver, thereby reducing the increase of the number of necessary transmission bands and the arithmetic complexity on the receiving side. A code conversion and transmission apparatusfor inputting audio coded data includes first to N-th code conversion and transmission unitsandtofor converting audio data to N pieces of coded data, and transmitting the data at predetermined or adaptively variable time intervals to M transmission lines. The second to N-th audio code conversion and transmission unitstocodes a frame at a compression rate equal to or higher than the rate of input coded data. The code conversion and reception apparatusselects a transmission line using a selection unit, and selecting data from correctly received coded data in a frame or packet unit, thereby reconfiguring the coded data using a coded data reconfiguration unit

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Tokyo, Japan

Hiroaki Dei