Abstract: Provided are a delay time measurement server, a delay time measurement method, and a program for calculating a video display delay time without arranging a special device on the client side. The delay time measurement server calculates a video transmission delay time from when a video signal obtained by encoding a specific video is transmitted toward a monitor until when a reaction signal for the specific video is received, as a video display delay time from when the video signal is transmitted toward the monitor until when the video is displayed on the monitor.

Abstract: An object of the present disclosure is to reduce a delay time until a specific video input is output at the time of inputting a plurality of asynchronous video images and synthesizing the images. The present disclosure is an apparatus for synthesizing a plurality of asynchronously input video signals into a video signal displayed on one screen, wherein the plurality of video signals are synthesized such that a delay of a video signal of a pivot input set among the plurality of video signals is reduced.

Abstract: An object of the present disclosure is to enable low-delay video transmission in applications requiring video transmission with low delay even when the network is congested. The present disclosure relates to a device which acquires a status of an application using video transmission; selects an encoding scheme and a decoding scheme of a video signal generated by the application according to the status of the application; and secures resources of a data transmission network that transmits the video signal according to the selection result.

Abstract: An object of the present disclosure is to reduce a delay in time from the video input of an asynchronous video to the output of a composite video. The present disclosure is a device and a method, in which the device composes a plurality of video signals which have been input asynchronously into a video signal displayed on one screen, wherein the one screen is constituted by a plurality of sub-screens the number of which is greater than the plurality of video signals, and the plurality of video signals are arranged on a sub-screen out of the plurality of sub-screens such that an output delay of each video signal is reduced to compose the plurality of video signals.

Abstract: An object of the present disclosure is to provide a communication path switching method for improving a throughput of TCP communication at the time of switching a communication path between a first communication path that is at least one of a low latency or high speed and a second communication path that is at least one of a high latency or low speed.

Abstract: The present disclosure includes a unicast-multicast converting apparatus 105, a multicast-unicast/multicast-multicast converting apparatus 113, and a multicast-unicast converting apparatus 114 are connected to a network between a content server 106 performing web delivery and a terminal 117 using a multicast communication networks 102 and 112. Through the multicast-unicast/multicast-multicast converting apparatus 113, a content group each including a plurality of contents grouped is transferred both in multicast and unicast.

Abstract: In order to solve the above problem, an object of the present invention is to provide a network system, a control method, a database, a controller, and a program capable of path construction in a device IF direct access network without disclosing connection information. A network system according to the present invention (1) specifies and records a location on a network of a user and a device used by the user by using exchange of authentication data using a media signal of the device, and (2) when the user makes a connection request to content by using a user name, a controller solves location information on the network by using the user name, controls the network, and realizes connection between the content and the device.

Abstract: An object of the present disclosure is to measure a delay time occurring in a device that receives or outputs a video or an audio without requiring a special apparatus or precise inter-apparatus time synchronization.

Abstract: An object of the present invention is to provide a communication method, a transceiver, a relay, a communication system, and a program capable of performing high-speed communication even in a case where there is an obstacle between two separated points in water. In this communication method, two points each confirm the other's position by using sound wave communication which is likely to be diffracted as a wave due to a relatively small frequency and a large wavelength. Since the communication method uses optical wireless communication in which straightness is high but high-speed communication is possible, a relay capable of forming a path for communication while avoiding an obstacle is selected from a plurality of relays. In this communication method, signals are transmitted and received by using optical wireless communication using a relay on the path.

Abstract: An object of the present disclosure is to enable data collection from a plurality of USB devices installed at remote locations. The present disclosure is a USB transmission system including: a device-side transmitter/receiver configured to transmit/receive data to/from a USB device; and a host-side transmitter/receiver configured to transmit/receive data to/from a USB host, in which each of the device-side transmitter/receiver and the host-side transmitter/receiver includes a data transmission/reception unit configured to transmit/receive a packet of a USB protocol layer via a data network, and the host-side transmitter/receiver includes a hub configured to transfer data to be transmitted/received by the data transmission/reception unit included in the host-side transmitter/receiver to the USB host.

Abstract: An object of the present invention is to provide a communication method, a transceiver, a relay, a communication system, and a program capable of performing high-speed communication even in a case where there is an obstacle between two separated points in water. In this communication method, two points each confirm the other's position by using sound wave communication which is likely to be diffracted as a wave due to a relatively small frequency and a large wavelength. Since the communication method uses optical wireless communication in which straightness is high but high-speed communication is possible, a path for communication while avoiding an obstacle via a relay is calculated. In the communication method, the relay is guided and moved to an appropriate place according to the calculated path, and a signal is transmitted and received by using optical wireless communication using the relay that has moved to an appropriate place.

Abstract: An object of the present disclosure is to reduce a delay time from input of a plurality of videos to output of combined videos. The present disclosure is a video combining device detecting a time deviation between a timing of a frame of each video and a predetermined timing when videos from a plurality of cameras are combined into one screen, giving an instruction for an imaging frame rate to the cameras such that the time deviation is reduced, and combining the videos from the plurality of cameras into one screen and outputting the combined videos.

Abstract: An object of the present disclosure is to reduce a system load imbalance between APs and unfairness in communication quality between users subordinate to each AP.

Abstract: The present disclosure is intended to enable efficient content forwarding in an HTTP-based web distribution system while maintaining HTTP, which is unicast. In the present disclosure, a unicast-multicast conversion device and a multicast-unicast conversion device that are connected, by using a multicast communication network, with a network between a content server and a terminal that perform web distribution are provided. The unicast-multicast conversion device and the multicast-unicast conversion device execute, in both multicast and unicast, forwarding of a content group into which a plurality of contents are grouped.

Abstract: An object of the present invention is to provide a network authentication system and a network authentication method capable of highly securely authenticating connection or a use place of a device without depending on a connection interface system in a mode in which a device such as audio/video equipment is directly connected to a public network. A network authentication system according to the present invention generates authentication information by a device other than a device such as audio/video equipment, and transmits the authentication information to the device as a media signal.

Abstract: An object of the present disclosure is to distribute content with a high quality and low latency without being limited by a low-rate and unstable network and a low-capacity reception-side edge servers while maintaining sufficient traffic reduction effects. A content distribution system according to the present disclosure converts part of communication for distribution into multicast communication. In the content distribution system, a transmission-side edge server (UC/MC) generates and transmits a plurality of multicast streams having different transfer rates for the same input content, and a reception-side edge server (MC/UC) selects and receives a multicast stream having a desired transfer rate among the plurality of transmitted multicast streams.

Abstract: An object of the present disclosure is to provide a remote rendering system, an image processing method, a server device, and a program capable of efficiently performing pre-rendering, reducing a delay in displaying an image to a user, and reducing a deviation between a line-of-sight direction of the user and a rendered image.

Abstract: The present disclosure has an object to make it possible to transfer a large volume of image data to display devices that are at remote locations and that have different display performances, through a plurality of networks having different available bandwidths. In an image delivery system in the present disclosure, a sending device packetizes image data by at least one of a frame and a scanning line, writes a plurality of identifiers in headers, and sends packets, and a receiving device selectively receives image data for which a predetermined identifier of the plurality of identifiers is written in the header.

Abstract: The present disclosure aims to make it possible to transfer multicast packets at as high a rate as possible according to a state of a network, to perform high-quality and low-latency content distribution, and to perform stable multicast distribution on a network that is less likely to ensure a fixed available band such as a best-effort or wireless network. The present disclosure is a content distribution system for converting part of communication for distribution into multicast communication, in which a transmission-side edge server (UC/MC) applies Forward Error Correction to a multicast packet and transmits the multicast packet, a reception-side edge server (MC/UC) notifies the transmission-side edge server of information of packet loss of the received multicast packet, and the transmission-side edge server (UC/MC) changes a transfer rate of a multicast packet to be transmitted based on the notified information of packet loss.

Abstract: An object of the present disclosure is to distribute content with a high quality and low latency without being limited by a low-rate and unstable network and a low-capacity reception-side edge servers while maintaining sufficient traffic reduction effects. A content distribution system according to the present disclosure converts part of communication for distribution into multicast communication. In the content distribution system, a transmission-side edge server (UC/MC) generates and transmits a plurality of multicast streams having different transfer rates for the same input content, and a reception-side edge server (MC/UC) selects and receives a multicast stream having a desired transfer rate among the plurality of transmitted multicast streams.