Ricoh Company, Ltd.

Naoki Tsumura

Tomonori Tanaka

Noriyuki Terao

Junichi Ikeda

Hiroo Kitagawa

Toshihiro Tsukagoshi

Keiichi Iwasaki

Hidetake Tanaka

Iwao Hamaguchi

Hiroyuki Kimbara

Koji Oshikiri

Satoru Numakura

Yutaka Maita

Atsuhiro Oizumi

Hiroshi Tamura

Satoshi Yamauchi

Shigetaka Tanaka

Takashi Katooka

Shozo Kudo

Takeshi Ukegawa

Naoto Hikichi

Takashi Ezaki

Yoshihisa Ooguro

Chihiro Narumi

A wireless communication system includes code transmitters () each configured to transmit a time-varying code; code receivers () each configured to receive the time-varying codes transmitted from the code transmitters () and generate a fingerprint based on the received time-varying codes, the fingerprint being unique to a space where the time-varying codes are receivable; and terminal devices () configured to establish wireless communication connection therebetween with authentication. The terminal devices () are connected to the code receivers (), respectively. Each terminal device () includes a fingerprint acquiring unit configured to acquire the fingerprint from the code receiver (), a wireless communication unit configured to transmit and receive the fingerprint via wireless communication, and an authentication unit configured to authenticate another terminal device if the fingerprint received from the another terminal device matches the fingerprint acquired from the code receiver connected thereto.

Wireless communication system and terminal-device authentication method in wireless communication system

An information processor that is connected to at least one other information processor via a network, includes a detecting unit that detects an optional device to be used for information processing, as a target optional device, installed on the other information processor, an issuing unit that issues an access request to use the target optional device to the other information processor, a receiving unit that receives an access permission for access to the target optional device from the other information processor, and a processing unit that performs the information processing with the target optional device.

Information processor configured to detect available space in a storage in another information processor

A high-speed serial switch fabric is configured to perform a mapping of a traffic class that is capable of differentiating traffics onto a virtual channel. The high-speed serial switch fabric connects a plurality of devices. A traffic-class setting unit sets, when a conflict occurs between devices connected to the high-speed serial switch fabric, the traffic class for each of traffics in the devices having the conflict. A channel setting unit assigns each of set traffic classes to different virtual channels, and gives a priority of data communication to each of the set traffic classes.

High speed serial switch fabric performing mapping of traffic classes onto virtual channels

A communication terminal apparatus connected to an analog communication network includes a line interface circuit, a digital signal processing circuit provided with a network control signal processing section and a modulation and demodulation processing section, and a power-saving control device to carry on the operation of the line interface circuit and the network control signal processing section and suspend the operation of the modulation and demodulation processing section so as to be into a power-saving state when a predetermined power-saving state change factor has occurred in a normal operating state, and resume the suspended operation of the modulation and demodulation processing section when an incoming call signal is received during the power-saving state.

Communication terminal and facsimile apparatus connected to an analog communication network and provided with a power management feature

A telecommunication apparatus includes a translation unit for translating a received document from a source language to a target language and discriminates the source language based upon a protocol message transmitted from a remote terminal for setting up a connection.

Telecommunication apparatus having a capability of translation

A method and apparatus for facsimile transmitting having an error retransmission function. A page of information is divided into a plurality of frames. The frames are transmitted on a block-by-block basis with each block having a predetermined number of frames. The information is received at a receiving station and checked for errors. If errors are present an indication is submitted back to the transmitting station so that the frames having errors can be retransmitted. A plurality of buffers is provided so that the first information can be transmitted from a first buffer while the next image information is being encoded and stored in a second buffer.

Error-corrected facsimile communication control system

A digital signal processing device for processing signals in the audio-frequency band with using a digital input-output interface circuit, analog input-output interfaces as well as digital signal processing circuit for converting digital signals to analog signals and vice versa. A memory is used for storing various programs for processing MODEM functions, voice-coding/synthesizing and the like in the digital signal processor selectively employs either one of the MODEM function processing programs and the voice coding/synthesizing function program, both of which are stored in the memory in accordance with an external command.

Device for processing digital signal in audio-frequency bandwidth

A facsimile machine includes a MODEM, an attenuator, an NCU and a controller. A signal from the MODEM is adjusted in level by the attenuator under the control of the controller and then output to a transmission line through the NCU. In this case, the adjustment of the level of the signal to be transmitted is carried out in accordance with a predetermined characteristic, such as frequency, of the signal to be transmitted. Also provided is a push phone having a DTMF signal generating circuit and a DTMF signal is also adjusted in level before being output to the transmission line in a manner similar to the signal from the MODEM.

Facsimile machine having an output level adjusting function

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Kanagawa, Japan

Naoki Tsumura