Canon Kabushiki Kaisha

Toshihiko Myojo

Ichiro Kato

Norihiro Mochizuki

Rie Suzuki

Tetsuo Kanda

Kazuo Moritomo

Katsuo Saito

Atsushi Takasaki

Hidetada Nago

Akira Torisawa

Tatsuhiko Sakai

Yasuhiro Takahashi

Hideaki Sato

Tadashi Eguchi

Junji Shigeta

Shinichi Yamazaki

Takao Fujita

A control station apparatus performs wireless communication with a plurality of communication apparatuses and sends data to the communication apparatuses. The control station apparatus receives, from each of the communication apparatuses, identification information of other communication apparatuses with which the communication apparatus is capable of wireless communication; selects, from among the plurality of communication apparatuses, at least one relay apparatus that relays transmission of the data, based on the received identification information; determines a communication timing for the relaying performed by the selected relay apparatus; and notifies the selected relay apparatus of an instruction to perform data relay and the communication timing. The control station selects the relay apparatus so that a communication apparatus that receives the data from the control station apparatus via two or more transmission paths is present.

Control station apparatus and control method thereof, communication apparatus and control method thereof, and wireless communication system

A remote control device searches for an image data storing device and a printing device that can be used by a user, and notifies an image taking device of device information obtained as a result of this search. The image taking device searches for a device having a predetermined function in response to an instruction from the remote control device, and if a device included in the device information notified by the remote control device is found, transfers an image to the found device. Alternatively, the image taking device connects to a device notified by the remote control device, and sends the image to the notified device to perform printing or storing thereon.

Information processor and control method therefor

The claimed invention is directed to a communication apparatus which comprises a monitor unit that monitors communication conditions with a plurality of networks; a setting unit that performs adjusting and setting a communication timing to communicate with each of the plurality of networks in accordance with the communication condition of each network and notifying the plurality of networks of information about the set communication timings; and a communication unit that switches communication to each of the plurality of networks on the basis of the setting of the communication timings, wherein said setting unit dynamically changes the communication timing on the basis of the communication condition monitored by said monitor unit.

Communication apparatus and communication control method

An image storage device creates index image data representing an index image. One index image contains a plurality of original images. The image storage device maps an inherent identifier of each of the plurality of original images to a second identifier of each of the plurality of original images. The second identifier of each of the plurality of original images corresponds to a position in each of the original images in one index image. The storage device transmits the index image to a selection device. The selection device selects one of the inherent identifiers, corresponding to the second identifier inputted.

Index image creating device

When an incoming call is received from a public network while a portable phone capable of communication via the public network and local communication is in local communication with a first local communication device, a second local communication device is searched and selected to perform local communication with the second local communication device and respond to the incoming call from the public network by using the second communication device.

Communication device

In order to prevent illegal data tampering or leakage of information caused by devices connected to a system such as a conference system and save time and trouble in setting functional restrictions separately from an application, an access point uses authentication information for authenticating electronic devices operated by participants who participate in a conference also as the information to decide functional restrictions on the electronic devices during the conference.

Communication system and management apparatus and method for restricting functions in communication system

A control apparatus for controlling a wireless communication system, which provide enhanced communication efficiency when a single apparatus performs a plurality of wireless communications. A timing signal generation logic circuit generates transmission and reception timing control signals for controlling timing of transmission and reception by respective ones of a Bluetooth module and a wireless LAN module based on respective states thereof. MAC sections of the respective modules control transmission and reception by the respective ones of the Bluetooth module and the wireless LAN module, based on the respective corresponding transmission and reception timing control signals generated by the timing signal generation logic circuit.

Control apparatus for controlling wireless communication system, communication apparatus and control method therefor

In an image pickup apparatus capable of mounting a media cardhaving a nonvolatile memory and a communication circuit, when image data of a captured image is transmitted to an external, the image data corresponding to a data length of a packet is stored in the nonvolatile memory of the media card, and the image data is sent to the communication circuitof the media card and divided into a plurality of packets to be transmitted to the external. When transmission of the image data is aborted, the image data still not stored in the nonvolatile memory is stored in the nonvolatile memory.

Image pickup apparatus

In a communication system including plural communication apparatuses that communicate each other using a single communication path, the state of the communication path is detected for communication. If the communication path is busy, a first control method is performed for controlling access to the communication path using a back off time selected at random. A second control method secures the communication path by transmitting and receiving the predetermined signal at transmission of a signal so as to control access to the communication path. In accordance with the kind of the signal to be transmitted, the first or the second control method is selected for communication. Thus, plural communication apparatuses can perform efficient communication.

Method and apparatus for data transmission with control over access to a transmission medium

A bidirectional optical space transmission system is made up of a pair of optical transmission apparatus. Each optical transmission apparatus comprises a signal generating circuit for generating a pilot signal, a multiplexing section for multiplexing the pilot signal and a main signal to be transmitted, an electrooptic converter section for emitting an optical signal on the basis of the signal produced by the multiplexing process, a light receiving element for receiving an optical signal transmitted from the partner optical transmission apparatus and detecting a pilot signal contained therein, and a demodulation circuit for demodulating the pilot signal detected by the light receiving element. Pilot signals multiplexed with main signals to be transmitted through the bidirectional optical transmission system are subjected to spreading modulation and demodulated for spreading by the demodulation circuit.

Optical transmission apparatus and bidirectional optical space transmission system using the same

A receiving apparatus includes a base-band conversion circuit, a synchronizing circuit/code generator and a demodulator. The base-band conversion circuit converts a received signal into a base-band signal. The synchronizing circuit/code generator detects a spread code included in the received signal to generate a plurality of spread codes in synchronization with the spread code included in the received signal. The demodulator uses the plurality of spread codes supplied by the synchronizing circuit/code generator to demodulate the base-band signal.

Spread spectrum receiving apparatus

A multiple communicating apparatus has a multiple communicating unit for communicating data through a plurality of channels and a control circuit for controlling the multiple communicating unit in a manner such that the transmission electric power of each channel is inversely proportional to the number of channels which are used by the multiple communicating unit. The control circuit includes a channel control circuit for controlling the number of channels which are used by the multiple communicating unit in accordance with a transmission speed. The multiple communicating unit includes a diffusion circuit for diffusing parallel data by a plurality of diffusion code series. The multiple communicating unit transmits a multiple number for a preamble period of time provided for the reception side to synchronize the plurality of code series which are used for a code division multiple with the transmission side.

Multi-channel communication

A spread spectrum receiving apparatus is constructed by a generator for generating a reference clock, a phase shift circuit for shifting the phase of the reference clock generated by the generator in accordance with a code timing in a reception signal and the reference clock, and a de-spreading circuit for de-spreading the reception signal in accordance with the reference clock whose phase is shifted by the phase shift circuit. The de-spreading circuit generates a code for de-spreading in accordance with the phase shifted reference clock. The phase shift circuit has a calculator for calculating a phase shift amount so as to synchronize the code timing in the reception signal with the code for reception in accordance with a deviation between the code timing in the reception signal and the reference clock.

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Yokohama, Japan

Toshihiko Myojo