Abstract: A power transmitting apparatus including a power supply to generate AC power; a power transmitting inductor to transfer the AC power to a power receiving apparatus through magnetic coupling with a power receiving inductor in the power receiving apparatus; a mutual coupling adjusting unit to adjust a relative position between the power transmitting inductor and the power receiving inductor; and a control unit to control the mutual coupling adjusting unit based on a mutual coupling coefficient between the power transmitting inductor and the power receiving inductor. The control unit controls the mutual coupling adjusting unit so that the mutual coupling coefficient falls within a predetermined range and an upper limit of the predetermined range is a value less than a maximum of the mutual coupling coefficient between the power transmitting inductor and the power receiving inductor.

Abstract: According to one embodiment, a data transmission device, includes: a wireless transmitting circuitry transmitting a wireless signal; measurement circuitry measuring a state of a measurement target at a first sampling rate and acquiring a first measurement value of the state of the measurement target; and controlling circuitry determining whether the first measurement value satisfies a first condition based on a first threshold value. The wireless transmitting circuitry transmits the plurality of first measurement values acquired before the first condition is satisfied when the first condition is satisfied. The measurement circuitry switches the first sampling rate to a second sampling rate higher than the first sampling rate when the first condition is satisfied, measures a state of the measurement target at the second sampling rate, and acquires a second measurement value of the state of the measurement target. The wireless transmitting circuitry transmits the second measurement value.

Abstract: According to one embodiment, a wireless communication device connected with a multi-hop network includes one or more processors. The processors communicate with a first parent node of the wireless communication device and with a child node of the wireless communication device. The processors transmit an instruction to restrict communication to the child node or do not receive data from the child node when receiving an abnormality notification indicating an abnormality from the first parent node.

Abstract: According to one embodiment, a data management device collecting data from a plurality of wireless nodes in a wireless multihop network is provided. The data management device includes a transceiver configured to transmit and receive a radio signal; and controlling circuitry. The controlling circuitry determines a first range of numbers of hops from the data management device for execution of route control in the wireless multihop network, performs the route control for the first range of numbers of hops and does not perform the route control beyond the first range of numbers of hops from the data management device.

Abstract: An imaging system includes a sound recording apparatus and an imaging apparatus that is connected to the sound recording apparatus and records, as moving-image sounds, sounds collected by the sound recording apparatus. The imaging apparatus detects whether the sound recording apparatus has been connected thereto. Upon detecting that the sound recording apparatus has been connected to the imaging apparatus, the imaging apparatus sets a sound-recording condition associated with the sound recording apparatus as a sound-recording condition for the imaging apparatus in a sound recording process and records sounds under the sound-recording condition that has been set.

Abstract: According to an embodiment, a wireless communication device includes a memory and one or more hardware processors coupled to the memory. The one or more hardware processors are configured to function as a communication control unit and a determination unit. The communication control unit transmits and receives data to and from a first wireless communication device. The determination unit calculates transmission and reception information based on a transmission and reception result of the data, and variation of received signal intensity of the data, and determines whether to maintain connection to the first wireless device based on the transmission and reception information and the variation. The communication control unit controls communication according to a determination result of the determination unit.

Abstract: According to one embodiment, a data transmission device, includes: a wireless transmitting circuitry transmitting a wireless signal; measurement circuitry measuring a state of a measurement target at a first sampling rate and acquiring a first measurement value of the state of the measurement target; and controlling circuitry determining whether the first measurement value satisfies a first condition based on a first threshold value. The wireless transmitting circuitry transmits the plurality of first measurement values acquired before the first condition is satisfied when the first condition is satisfied. The measurement circuitry switches the first sampling rate to a second sampling rate higher than the first sampling rate when the first condition is satisfied, measures a state of the measurement target at the second sampling rate, and acquires a second measurement value of the state of the measurement target. The wireless transmitting circuitry transmits the second measurement value.

Abstract: According to one embodiment, a data management device collecting data from a plurality of wireless nodes in a wireless multihop network is provided. The data management device includes a transceiver configured to transmit and receive a radio signal; and controlling circuitry. The controlling circuitry determines a first range of numbers of hops from the data management device for execution of route control in the wireless multihop network, performs the route control for the first range of numbers of hops and does not perform the route control beyond the first range of numbers of hops from the data management device.

Abstract: A wireless communication device includes a memory and a wireless interface and processing circuitry. The memory configured to store data to be transmitted and received. The wireless interface configured to transmit and receive a wireless signal. The processing circuitry coupled to the memory and configured to receive a message from another wireless device, including destination information and acknowledgement information, via the wireless interface, set, in a first period being a period in which the message from a child node which transmits the message upward while setting the child node itself as a destination is received, the acknowledgement information with respect to data received from the child node, process the message including the destination information and the acknowledgement information, and transmit a message including the set acknowledgement information via the wireless interface to another wireless device.

Abstract: According to one embodiment, a wireless communication device connected with a multi-hop network includes one or more processors. The processors communicate with a first parent node of the wireless communication device and with a child node of the wireless communication device. The processors transmit an instruction to restrict communication to the child node or do not receive data from the child node when receiving an abnormality notification indicating an abnormality from the first parent node.

Abstract: According to an embodiment, a communication apparatus includes a receiver, a first beacon processor, a second beacon processor, and an authentication processor. The receiver receives a first beacon transmitted over a wireless network while being protected by a first common key and a second beacon transmitted over the wireless network while not being protected by the first common key. The first beacon processor accesses the wireless network using information contained in the first beacon when the first common key is provided. The second beacon processor accesses the wireless network using information contained in the second beacon when the first common key is not provided. The authentication processor performs connection authentication to the wireless network using information contained in the second beacon and acquires the first common key.

Abstract: An imaging system includes a sound recording apparatus and an imaging apparatus that is connected to the sound recording apparatus and records, as moving-image sounds, sounds collected by the sound recording apparatus. The imaging apparatus detects whether the sound recording apparatus has been connected thereto. Upon detecting that the sound recording apparatus has been connected to the imaging apparatus, the imaging apparatus sets a sound-recording condition associated with the sound recording apparatus as a sound-recording condition for the imaging apparatus in a sound recording process and records sounds under the sound-recording condition that has been set.

Abstract: According to an embodiment, a wireless communication device performs time-division communication and includes a storage and one or more processors. The storage is configured to store transmission data to be sent in a first period of time. The one or more processors are configured to perform a transmission process of sending the transmission data in a first frame at start of a plurality of frames included in the first period of time, or perform a transmission process of sending a pieces of divided the transmission data in a plurality of successive frames beginning from the first frame and included in the first period of time. After the transmission process, the wireless communication device switches to sleep mode in one or more frames of the first period of time.

Abstract: According to one embodiment, a communication device includes one or more processors. The one or more processors functions as a wireless transmission unit, a plurality of communication control units, and a selection unit. The wireless transmission unit communicates in accordance with a set wireless transmission scheme. The communication control units control the wireless transmission unit by different wireless transmission schemes. The selection unit selects one communication control unit to be applied from among the communication control units in accordance with a set selection condition.

Abstract: In a first subframe determined from a first number of hops up to a concentrator and being among a plurality of subframes included in a first frame period, a first wireless communication apparatus transmits first data, a second wireless communication apparatus transmits second data, and a third wireless communication apparatus receives the second data. In a second subframe determined from a second number of hops different from the first number of hops up to the concentrator and not corresponding to the first subframe among a plurality of subframes included in a second frame period following after the first frame period, the third wireless communication apparatus transmits the second data, and the third wireless communication apparatus does not transmit the second data in the first frame period.

Abstract: According to one embodiment, a communication apparatus includes a radio interface unit that sends a data message to a receiver and extracts, when a message sent by the receiver via unicast with an optimized transmission rate is received, rate information indicating the optimized transmission rate of the receiver from the received message, a message processor that generates the data message, in which a multicast identifier indicating a multicast group is a destination, and outputs the data message to the radio interface unit, and a selector that selects, according to the rate information, a data message transmission rate to send the data message.

Abstract: A wireless communication device according to an embodiment is one of a plurality of wireless communication devices in a multihop wireless communication system to transmit and receive information with each other. The wireless communication device has: a transmitter configured to transmit information in an m-th slot (m is an integer equal to or more than 1 and equal to or less than M, M is an integer equal to or more than 2) in a first slot group in N slot groups (N is an integer equal to or more than 2) in a frame, respective one of the slot groups including M slots, and a controller configured to control the transmitter to receive a connection request in an m-th slot in a second slot group in the N slot groups from a wireless communication device not included in the plurality of wireless communication devices.

Abstract: According to one embodiment, there is provided a power transmitting device including: a power supply, a resonator, an adjuster and a controller. The power supply supplies AC power. The resonator includes a magnetic core and a coil wound around the magnetic core, the resonator wirelessly transmitting the AC power supplied from the power supply to a different resonator arranged to be opposed to the resonator. The adjuster relatively moves the coil and the magnetic core along a longitudinal direction of the coil. The controller controls the adjuster based on a value of current flowing in the resonator to adjust relative positions of the magnetic core and the coil.

Abstract: According to one embodiment of the present invention, there is provided a communication device includes: processing circuitry configured to generate first bitmap data indicating a calculated value of a function based on identifiers of other first communication devices; and a communicator configured to transmit a first message including the first bitmap data.

Abstract: A communication device according to an embodiment is included in a multi-hop network. The communication device includes a holder, a storage, a switcher, and a controller. The holder holds communication data. The storage stores path information including an identifier that identifies a communication path and destination information that indicates a destination of communication data on the communication path. The switcher switches a communication path used to transmit communication data on the basis of the path information stored in the storage. The controller transmits communication data to a destination of a communication path switched by the switcher.