Sharp Kabushiki Kaisha Corporation

Fumihiro Fukae

Hitoshi Naoe

Koji Sakai

Shohei Osawa

Shohei Ohsawa

Yuji Ichikawa

Kota Tanaka

Atsuhiro Doi

Takashi Nishimura

Kazuyuki Sumi

Kenji Mameda

Tsukasa Kaminokado

Daisuke Nakano

Kohji Sakai

In a transmitter (), when generating a transmission frame having no limitation to a window size, a batch-transmission-end flag generating circuit () and a sequence number generating circuit () respectively adds a batch-transmission-end flag and a sequence number to the transmission frame. In a receiver, if an omission of a sequence number is detected as a result of analyzing sequence numbers of frames having received from the transmitter (), retransmission request is made when receiving a frame whose batch-transmission-end flag indicates the end. In this way, retransmission is possible in data transmission using UI frames, and the communication efficiency can be improved.

Communication device, non-transitory computer-readable medium storing a communication program

A transmitter () which transmits a predetermined amount of transfer data using an infrared ray includes: a controller () for transmitting an SNRM command to the other station without transmitting a station-search command (XID) for searching the other station, the SNRM command including parameters such as maximum transferable speed and maximum receivable data length of the transmitter (); and a transmission section (). Consequently, it is possible to shorten a time necessary for a connection between the transmitter and the receiver. This allows shortening a time from the start of communication to the end of the communication in transmitting information data.

Communication device, communication system, communication method, and communication circuit

A plurality of connection frames are transmitted which differ from each other in at least either modulation scheme or transfer rate. Accordingly, a receiving-end device can properly receive a connection frame even in an environment where the connection frame is likely to be affected by noise.

Data transmission with dynamic modulation scheme and/or transfer rate

A communications device is provided which receives data frames in FIR communications mode even if the device has failed to normally receive a connect frame in SIR communications mode. A communications device according to the invention includes an incoming frame processing section for receiving an SNRM frame and UI frames in different frame formats. The SNRM frame contains a setting for a connection for data communications. The UI frames contain data. The communications device also includes a reception processing section and connect command notification sections. The reception processing section renders a light reception section stand by for reception of the UI frames in FIR communications mode. The connect command notification sections generate a connect command for output to an upper layer. The connect command enables establishing of the same connection when a data frame is received from another communications device as when a connect frame was received from the other communications device.

Communications device, communications method, and storage medium

The present invention is a network layer protocol used for free-space optical transmission utilizing an LED or LD as a light source. In order to connect to a device, the network layer issues a connection request command (LAP_con_req) to a lower layer when the network layer has received a connection request command (LM_con_req) from an upper layer. Furthermore, when the network layer has received a connection confirmation command reception notification (LAP_con_conf) from the lower layer, the network layer issues a connection confirmation command reception notification (LM_con_conf) to the upper layer without issuing a data transfer request command to the lower layer. Accordingly, the invention provides a network layer protocol with which time for a connection or disconnection is reduced.

Communication device, communication system, communication method, communication program, and communication circuit

Provided is a communication system including a transmitter and a receiver which carry out communication by establishing connection of their plurality of communication layers. The transmitter generates a connection request containing a command and data required for connecting a number of contiguously adjacent layers among the plurality of communication layers and transmits the connection request to the receiver. The receiver receives a connection request containing a command and data required for connecting a number of contiguously adjacent layers among the plurality of communication layers, extracts the command and data from the connection request, and establishes connection for the plurality of communication layers based on the command and data. In this way, the time taken to establish connection is reduced. Therefore, even when the connection is cut off during the data exchange, the connection can be established again without taking much time, allowing quick recovery of data exchange.

Transmitter, receiver, communication system, communication method, non-transitory computer readable medium

A communication apparatus () is a primary station for communicating with a secondary station, and includes: a first protocol control section () for transmitting, at a time when communication connection is to be established with the secondary station, (i) a station discovery command with which to confirm a presence of the secondary station, and (ii) a first connect request command, after the station discovery command is transmitted, so as to carry out connection processing; second protocol control means () for transmitting, at a time when communication connection is to be established with the secondary station, a second connect request command so as to carry out connection processing; and a protocol switching section () for (i) causing the first protocol control section () to initially transmit the station discovery command, and in a case where a response to the station discovery command has not been received after an elapse of a predetermined time since the station discovery command was transmitted, (ii) causing the second protocol control section () to transmit the second connect request command.

Communication apparatus, communication method, communication circuit, mobile phone, program, and computer readable recording medium with program recorded therein

In a client device () including OBject EXchange protocol (OBEX), a lower layer processing section () below an OBEX processing section () generates a pseudo response command for a request command, and notifies the pseudo response command to the OBEX layer processing section (). This makes it possible for the client device () to communicate, via object exchange, with a server device having no transmitting function.

The demodulation circuit of the present invention is a demodulation circuit, connected with a plurality of light-receiving sections each for receiving an optical signal and converting the signal into a binary pulse signal, operable to select and demodulate a pulse signal out of pulse signals that are supplied from the light-receiving sections, respectively, the demodulation circuit including: a judgment and selection section for detecting timing with which High level and Low level of each of the pulse signals are switched and for selecting at least one pulse signal based on the timing; and a demodulation section for demodulating the pulse signal selected by the judgment and selection section. Consequently, the demodulation circuit easily selects and demodulates a signal whose jitter component is small out of a plurality of supplied signals.

Demodulation circuit, IC, and communication device

A transmitter apparatus transmits transfer data having a predetermined amount to a receiver apparatus. The apparatus includes a data packet generating section dividing the transfer data into multiple divisional data sets; an error detection/correction code adding section adding an error detection code (error detection information) by which an error in the divisional data sets is detected to each of the divisional data sets; and a transmitter section transmitting the multiple divisional data sets to which the error detection code is added all together. Thus, data transfer is very reliable. It takes less time to transfer data.

Transmitter, receiver, data transfer system, transmission method, reception method, computer program for transmission, computer program for reception, and recording medium

A data transmitter includes (a) first communication means performing data transmission according to IrDA Standard, (b) second communication means performing data transmission that does not comply with the IrDA Standard and (c) means for switching between a process performed by the first communication means and a process performed by the second communication means. The second communication means includes (a) management information transmitting means for sending management information for managing transmission target data according to a data transmission prosecution command from a user, (b) communication capability information receiver means for receiving communication capability information indicating communication capability of a device that has responded to the transmission of the management information and (c) data transmission means for transmitting a packet including the transmission target data on the basis of the communication capability information. This can make the communication time shorter than the conventional communication time in infrared communication.

Dual mode wireless communication device using IrDA that doesn't comply with IrDA standard as the default mode and the second mode is compliant with IrDA standard

A two-way transmission system of the present invention is arranged in such a manner that, when a host-side controller confirms the receipt of an IN packet from a USB host, the host-side controller transfers the IN packet to a function-side controller, and receives a DATA packet from the function side. The received DATA packet is temporarily stored in a FIFO. At the time of the receipt of the IN packet again, the host-side controller supplies, to the USB host, the DATA packet stored in the FIFO.

Communication system realizing USB communications between a host computer and its peripheral device and a communication controller transmitting a USB signal under the USB standard

In optical two-way communication using a single optical fiber, part of the light transmitted from an apparatus is received as stray light by the apparatus itself. This occasionally hampers accurate detection of disconnection from the partner apparatus and of the start of data communication by the partner apparatus after the establishment of connection. To overcome this, the timing with which an apparatus transmits a tone signal after the establishment of connection is compared with the timing with which the apparatus receives a tone signal from the partner apparatus, and the two apparatuses use different sets of data transmission properties (for example, different wavelengths) to accurately detect disconnection. Moreover, based on the properties of the received light and the characteristics of the receiving amplifier, repetition of the same code for longer than a predetermined period is detected to accurately detect disconnection. Furthermore, in response to a request for data communication after the establishment of connection, a tone signal having a different pattern from that used to establish connection is used to accurately detect the start of data communication.

Apparatus and method for data communication including establishing communication using tone signal

In a data transmission method of the present invention, when transmission data are converted into the characters and the characters are transmitted as transmission signals in accordance with inputted data and a data transmission instruction, the interval between the data groups after the character conversion is broadened and then the characters are transmitted in a case where it is judged that the interval between the data groups after the character conversion is shorter than the interval between the data groups before the character conversion. This ensures communication devices to stably transmit and receive the data group even when the interval between the data groups after the character conversion is different from the interval between the data groups before the character conversion due to timing caused by the character conversion of the data.

Data transmission method, transmission circuit, and communication device

A transmitter/receiver apparatus has a status checker that checks whether a plurality of ports of different types are active or not and a reference table that holds, among the transmission delay values between the individual ports, the maximum values corresponding to different combinations of active ports. A value read out from the reference table according to the output signal of the status checker is assigned, as the transmission delay value of the transmitter/receiver apparatus, to a base register. This configuration permits efficient communication.

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Sakurai, Japan

Fumihiro Fukae