Canon Kabushiki Kaisha

Mitsuru Yamamoto

Hidetoshi Suzuki

Ichiro Nomura

Toshiaki Majima

Takayuki Kikuchi

Hiroshi Mashimo

Masanori Takenouchi

Tsuguhide Sakata

Fumitaka Kan

Naoji Hayakawa

Kazuhiko Houjou

Nobuaki Sakurada

Kenji Nakamura

Yoshitaka Watanabe

Yukichi Niwa

Junji Shimoda

Jun Hattori

Yasunori Ohora

Toru Nakata

Ichiro Kato

Kunio Watanabe

Noboru Yamamoto

Hiroyuki Yatsu

Kazuhiko Hojo

A communication system has a controller for transmitting data to be played back by a plurality of playback devices corresponding to a plurality of channels, and a plurality of adapters required for executing playback by the playback devices. The controller has a setting unit which sets data to be played back by the playback devices and control information required to control playback of the data in time slots of a sync transmission frame, and a transmission unit which transmits the sync transmission frame the by the setting unit to the adapters. Each adapter has a reception unit which receives the transmitted sync transmission frame, and a playback control unit which extracts data corresponding to the channel to be played back by the adapter from the sync transmission frame, and controls the playback timing of the data based on control information corresponding to the data.

Communication system

This invention constructs within the LAN a private area network (PAN) which is configured by terminal devices (personal computers and the like) of a specific group, is hardly influenced by the LAN traffic, and has high security. For this purpose, a PAN server which manages the communication route between specific terminals is installed within the LAN. The PAN server sets the communication route of each terminal device as label information, and causes switches and terminals to set pieces of label information generated for them. When the frame of data from a given port of each connection switch contains information representing PAN communication, the connection switch outputs the data to only a port specified by routing label information described in the frame.

Network switching apparatus, route management server, network interface apparatus, control method therefor, computer program for route management server, and computer-readable storage medium

A moving image network system which has high response to a moving image transmission request and prevents interruption of a moving image signal. Upon transmitting moving image data from terminal to terminal , controller adds a transmitter terminal address, priority and a coding type of the moving image data to transmission load information received by transmission load information receiver , and outputs the data to transmission load information transmitter . The controller encodes/decodes moving image data in accordance with transmission load information of the moving image data and adjusts transmission data amount corresponding to transmission load of a transmission path.

Network system and terminal apparatus

The present invention discloses a network system for an interactive transmission in first and second directions. The network system includes a plurality of node devices, and a first node device of the node devices can selectively output a signal in the first direction or perform the returning output of a signal. A second node device adjacent to the first node device outputs a signal to the first node device through a channel which is used by the first node device for the returning output, hence the first and second node device are controlled such that those first and second node devices do not use the returning channel of the first node device concurrently.

Transmission control method in a network system for interactively transmitting a signal between node devices and network system using the same

The present application concerns a server system for delivering signals. Particularly, the application concerns a server system capable of efficiently delivering continuous signals. In the present invention a plurality of reproducing devices are used and connection thereof with a plurality of channels is successively altered so that plural reproducing devices are not connected to one channel simultaneously. This alteration is always carried out or this alteration is carried out according to a pattern preliminarily set so that plural reproducing devices are not connected to one channel simultaneously, whereby upon start of delivery to a certain channel, the delivery can be started without consideration on the delivery conditions of signals to the other channels at that time.

Server system for delivering signal and delivery method of signal therein

A moving-image recording/reproducing apparatus for recording/reproducing a plurality of moving images by using a plurality of moving-image I/O passages includes: a plurality of moving-image recording/reproducing devices and a switch device for selectively establishing a connection between the plurality of moving-image I/O passages and the plurality of moving-image recording/reproducing devices. The apparatus further includes a control device for controlling the switching operation of the switch device, wherein the control device performs the recording/reproducing of the moving images input/output from each of the moving-image I/O passages by allocating the moving images to each of the moving-image recording/reproducing devices in accordance with an instructed sequential order, and controls the switching operation in such a manner that a plurality of the moving-image I/O passages are not allocated concurrently to the same moving-image recording/reproducing device.

Moving-image data recording/reproducing apparatus for simultaneously recording/reproducing a plurality of moving image data items using a plurality of recording/reproducing means

In a network system providing communication through a multi-channel transmission path with n channels, N buffers in each of plural node devices temporarily store signals for transmission through the n channels. A channel control device alters the channels through which the signals from the buffers are sent so that the signals from plural buffers cannot be sent concurrently to the same channel. A buffer control device controls the read out of signals from the buffers through the n channels selected for signal transmission synchronously with the channel alteration. A node device receiving signals from another node device includes reception devices that receive signals from the n channels, respectively.

Network system for communication with plural channels, node device and

A source terminal equipment connected to a node device transmits a packet by appending a section for designating the channel to be used upon relaying the packet by the node device to the packet. The relaying node device determines the channel used upon outputting the packet by looking up the value in the section for designation of the channel. The source terminal equipment transmits the packet by appending relaying number information indicating the number of relayings of the packet to the packet. Each node device looks up the relaying number information upon looking up the value in the section for designation of the channel. When each node device outputs a packet to a terminal equipment using a separation device for separating the packet toward the sub transmission path side, the node devices determines, based on the relaying number information, whether or not it separates the packet. This invention also discloses a method of generating a terminal equipment connection table and a method of registering connection information using the above-mentioned transmission method.

Network system for transmitting a plurality of channels, and node

In a network system for effecting signal transmission by plural channels, there are provided plural channel alteration units each of which is adapted to receive signals through plural channels and to output each of the signals entered by said plural channels in any of plural channels. Transmission control is executed in such a manner that mutually proximate plural signals, which have to be outputted by a designated same channel among the plural channels from a first one of the plural channel alteration units, are entered through respectively different channels into the first channel alteration unit. As the first channel alteration unit receives the plural signals by different channels, there can be resolved the drawback of a long waiting time for the output of the signals by a desired channel, encountered in case the signals are entered by a signal channel.

Transmission control method in network system for signal transmission by

A node device that is used in a network system has a packet processing circuit, a buffer for temporarily storing a packet and a selector for selecting a channel to which the buffer is to be connected. The selector can select either a first channel connected to another node device or a second channel connected to the packet processing circuit. The buffer can store a number of packets, and of these packets the one that is addressed to the packet processing circuit is read out when the buffer is connected to the second channel.

Node device used in network system for performing packet communications,

A node device is constructed such that the number of relayings can be reduced where communication is performed between terminal equipments connected to this node device. A signal from the terminal equipment is stored in a buffer of the node device. A part of output channels of a connection unit for selecting the output channel of the buffer is guided to a separation unit of this node device. The separation unit separates a signal, which is to be output to the terminal equipment connected to this separation unit, and sends the separated signal to this terminal equipment.

Network system having node devices connected therebetween, node device

A switching device include a buffer for temporarily storing a signal sent by a corresponding input terminal; variable channel transmission units, one of which is provided for each input terminal, for outputting a received signal with one of N different channels; fixed channel reception units, one of which is provided for each output terminal, for receiving the signal carried with a given channel and for outputting a signal with the given channel to a corresponding output terminal, with the given channel not overlapping any other; a variable channel control unit for synchronously altering, in consonance with predetermined patterns, channels with which the variable channel transmission unit outputs a signal, so that two or more variable channel transmission units do not simultaneously output signals with the same channel; and a buffer control unit for synchronously reading from the buffer a signal that is to be output, while altering the channel with which the variable channel transmission unit transmits a signal. Provided for the buffer is a function for sorting signals for output terminals at which the signals are to be output, and weighting of predetermined patterns is performed with a time at which one variable channel transmission unit outputs signals with the individual channels during one pattern cycle.

Simplified switching control device, and a network system for employing

A multi-media terminal apparatus controls switches to perform communications, so that processing units of its own terminal which controls various multi-media processing functions are connected to other multi-media terminal apparatuses via a transmission line having a plurality of channels in accordance with connection request instructions, or this connection state and connections among the processing units are simultaneously attained.

Method of connecting a first terminal to peripheral equipment connected

A node device for performing packet communication using a transmission line composed of a plurality of channels is connectable to a network having a plurality of node devices, each of the plurality of node devices connecting the transmission line to a sub-transmission line. The node device a has packet processor for processing a packet, first, second, and third devices for outputting a packet, a memory device and a transmitter. The first device corresponds to each of the plurality of channels and outputs a packet input on a predetermined one of the plurality of channels to a side of the sub-transmission line or a side of the transmission line. The second device corresponds to each of the plurality of channels and outputs a packet transmitted through the sub-transmission line to the transmission line side or the packet processor side. The third device outputs a packet supplied thereto from the packet processor to the sub-transmission line side. The memory device corresponds to each of first and second devices, and temporarily stores a packet output from each of the first and second devices. The transmitter transmits outputs from the memory device in channels different from each other.

Node device used in network system for packet communication, network

A network system for effecting signal transmission by connecting node devices with at least plural N channels is disclosed. It includes a first node device constituting at least a node device and having: N fixed-channel reception units for receiving the N channels; N buffers for temporarily storing signals received by the N fixed-channel reception units, wherein a buffer of the N buffers divides the received signals into first signals with designation of a channel for transmission and second signals without designation of a channel for transmission and further divides the first signals in respective designate channels; transmission units for transmitting the first and second signals released from the N buffers in the N channels; an end detection unit for detecting an end of reading of the first and second signals to be transmitted by channels currently capable of transmission; a channel variation control unit for controlling the transmission unit to vary the channels capable of transmitting released signals from the N buffers, in response to a detection of the end of reading by the end detection unit such that the released signals from two or more of the N buffers are not simultaneously supplied to a same channel; and a buffer control unit for controlling the N buffers, in synchronization with a variation of the channels capable of transmitting the released signals from the N buffers, to read the first and second signals be based on the variation of the channels.

Growing community of inventors

Yokohama, Japan

Mitsuru Yamamoto