Abstract: A data communication apparatus (a) determines a segment size and a segment data size in accordance with a size of a receiving buffer of the destination node, the size of the receiving buffer being determined by the destination node in accordance with a maximum payload size that can be received by the destination node, (b) divides object data into segments in accordance with the segment size, and (c) divides each segment into a plurality of segment data in accordance with the segment data size. The data communication apparatus (c) generates packets from the plurality of segment data, and (d) transfers the packets from the data communication apparatus to the destination node via a logical connection set between te data communication apparatus and the destination node, the logical connection being set by a controller.

Abstract: Image pickup processes of a plurality of image pickup apparatuses are synchronized by using one kind of communication medium (for example, IEEE 1394-1995 standard or its extended standard). A control device selects a master camera from the plurality of image pickup apparatuses. The master camera generates a time stamp for synchronizing frame synchronization signals of all of the image pickup apparatuses (including the master camera). All of the image pickup apparatuses (including the master camera) generate the frame synchronization signals on the basis of the time stamp generated by the master camera and generate image data on the basis of the generated frame synchronization signals.

Abstract: A communication system includes a source node including a first connection control register, a destination node including a second connection control register, and a controller. The controller is adapted to select one of a first and a second communication protocol as a communication protocol to be used between the source node and the destination node, to set a logical connection to be used between the source node and the destination node, to access the first connection control register to store therein information for the communication protocol selected by the controller and information for the logical connection set by the controller, and to access the second connection control register to store therein information for the communication protocol selected by the controller and information for the logical connection set by the controller. The first communication protocol uses an asynchronous transfer, but does not use an isochronous transfer.

Abstract: The present invention realizes a communication system and a method for a communication system including a source node, one or more destination nodes and a controller. The controller is adapted to notify the source node and the one or more destination nodes of first information representing the logical connection and second information that is unique to the controller, and the source node is adapted to divide data to be transmitted to the one or more destination nodes into a plurality of segment data, and transfer each of the segment data with the first and second information obtained from by the controller to the one or more destination nodes. In addition, each of the one or more destination nodes includes a receiving buffer, and is adapted to store each segment data in the receiving buffer.

Abstract: Communication apparatus having first communication device conformed to a first communication standard and second communication device conformed to a second communication standard different from the first communication standard. A control unit is coupled to the first and second communication device. The first communication device is capable of detecting whether or not another apparatus is disconnected from the first communication device. The control unit is capable of setting the second communication device in an active state if the first communication device detects that another apparatus is disconnected from the first communication device when the second communication device is in an inactive state. The second communication device is capable of being used to communicate with another apparatus when the second communication device is set in an active state, and is not capable of being used to communicate with another apparatus when the second communication device is set in an inactive state.

Abstract: A communication system, in which data transmission is interrupted for a bus reset, includes a source and a destination with a receiving buffer. The source is adapted to transmit a segment of data to the destination using address information corresponding to a part of the receiving buffer of the destination. Transmission of the data is interrupted if a process of resetting a bus between the source and the destination occurs. After the process of resetting the bus ends, the transmission of the data resumes without retransmitting data determined by the source to be already stored in the receiving buffer.

Abstract: Provided is a communication system for logically connecting a source node and one or more destination nodes, and for controlling data communication between the individual nodes by employing a connection ID that is used to identity the logical connection relationship. The communication system may comprise a source node adapted to transmit data packets, a destination node adapted to receive the data packets transmitted from the source node, and a controller adapted to manage a logical connection between the source node and the destination node, the destination node being adapted to abort communication between the source node and the destination node if the destination node received an abort packet transmitted from the controller, and the destination node being adapted to disconnect the logical connection after the communication is aborted by the abort packet. The source node itself, and methods of using the system and that node, are also individual aspects of what is disclosed.

Abstract: Communication of a device by controlling a wire communication interface to receive a bit stream from an external device via a wire transmission line, controlling a radio communication interface to receive a bit stream from an external device via a radio transmission line, and controlling the wire communication interface to transfer the bit stream received by the wire communication interface to another external device via the wire transmission line and to transfer the bit stream received by the radio communication interface to another external device via the wire transmission line. Additionally, the wire communication interface may be controlled to transfer the bit stream to an external device via a wire transmission line using an isochronous transfer mode.

Abstract: There is disclosed a communication system and communication protocol in which a source node and one or more destination nodes are logically connected, and a connection ID for identifying the logical connection relationship is used to control data communication between the nodes. There is also disclosed an efficient communication system and communication protocol in which an optimum time interval between a time to transmit an i-th (i being an optional integer) data and a time to transmit an (i+1)-th data can be set. There is further disclosed a communication system and communication protocol in which when the i-th data is not normally received, retry is inhibited only for a predetermined time to prevent the retry from unnecessarily occurring between a destination node slow in receiving process and a source node fast in transmitting process.

Abstract: Provided are a communication system and a communication protocol for logically connecting a source node and one or more destination nodes, and for controlling data communication between the individual nodes by employing a connection ID that is used to identity the logical connection relationship. Further, provided are a communication system and a communication protocol for correlating a connection ID with an offset address that designates in common the memory spaces included in one or more destination nodes, and for simplifying the designation of the offset address and the identification of the connection ID for data that are received. Furthermore, provided are a communication system and a communication protocol for inhibiting an increase in a delay time that occurs before data communication is initiated between a source node and a plurality of destination nodes.

Abstract: Provided are a communication system and a communication protocol for logically connecting a source node and one or more destination nodes, and for controlling data communication between the individual nodes by employing a connection ID that is used to identity the logical connection relationship.

Abstract: The source transmits a packet with a predetermined transfer rate to each destination and recognizes the maximum transfer rate to each destination according to the presence or absence of response to such packet. After the maximum transfer rate is recognized, the source generates plural packets from the information data and transfers these packets in succession at the maximum transfer rate. Thus the maximum transfer rate available between two or more electronic devices can be easily detected without complicated analysis.

Abstract: A communication system and a communication protocol are implemented by connecting the source node and one or more destination nodes logically, and controlling the data communication between each of the nodes by use of the connection ID whereby to identify such logical connection relationship.

Abstract: There is disclosed a communication system and communication protocol in which a source node and one or more destination nodes are logically connected, and a connection ID for identifying the logical connection relationship is used to control data communication between the nodes. There is also disclosed an efficient communication system and communication protocol in which an optimum time interval between a time to transmit an i-th (i being an optional integer) data and a time to transmit an (i+1)-th data can be set. There is further disclosed a communication system and communication protocol in which when the i-th data is not normally received, retry is inhibited only for a predetermined time to prevent the retry from unnecessarily occurring between a destination node slow in receiving process and a source node fast in transmitting process.

Abstract: This invention provides a communication apparatus and a communication method of transmitting and receiving command data for controlling a device connected to a communication line by selecting an arbitrary one of a plurality of different communication systems, wherein at least some of a plurality of command data of each of the different communication systems are used in all of the communication systems.

Abstract: Image pickup processes of a plurality of image pickup apparatuses are synchronized by using one kind of communication medium (for example, IEEE1394-1995 standard or its extended standard). A control device selects a master camera from the plurality of image pickup apparatuses. The master camera generates a time stamp for synchronizing frame synchronization signals of all of the image pickup apparatuses (including the master camera). All of the image pickup apparatuses (including the master camera) generate the frame synchronization signals on the basis of the time stamp generated by the master camera and generate image data on the basis of the generated frame synchronization signals.

Abstract: Information signal processing apparatus and method characterized in that an input information signal is converted into a transmission signal in a predetermined form and the converted transmission signal is transmitted by a selected one of a wire transmission and a radio transmission are provided. Information signal processing apparatus and method characterized in that either a wire reception to receive an information signal in a predetermined form through a transmission line or a radio reception to receive an information signal in which the information signal in the predetermined form was modulated and transmitted in a radio manner is selected and the received information signal in the predetermined form is reproduced are provided.

Abstract: In a communication system capable of automatically resetting the communication controlling ID of each device according to a change in the connection configuration of the network, the display position of the display information representing each device is controlled according to the ID information specific to each device. Thus, even in case of a change in the connection status of the plural devices, there can be achieved such control as not to change the display position of the display information representing each device, and as to display whether each device is still connected to the system, whereby the operability of the system can be improved.

Abstract: In a data communication system composed of plural equipment, there are provided display means for displaying the connection relationship among the plural equipment, and designation means for designating a specified equipment displayed by the display means. The user can easily confirm the connection state and the connection position of the specified equipment, by effecting communication for confirming the connection relationship of the specified equipment, according to the designation by the designation means. Also the user can easily understand the flow of the signals in the data communication system, by displaying the channel information, indicating the data flow among the equipment, and the equipment information.

Abstract: An image processing apparatus includes an input unit for inputting an image signal, a signal processing unit for processing an output from the input unit to generate an image signal of a first format, a conversion unit for compressing an output from the signal processing unit and converting the same to an image signal of a second format and a digital interface unit for selectively transmitting the output from the signal processing unit and the output from the conversion unit to an external equipment.