Hitachi, Ltd.

Maxell, Ltd.

Clarion Co

Hitachi Video Engineering, Incorporated

Takatoshi Shirosugi

Hitoshi Akiyama

Yasuo Yahagi

Osamu Kawamae

Shinichi Murakami

Isao Hoda

Sadao Tsuruga

Katsuei Ichikawa

Tsutomu Noda

Manabu Katsuki

Yoshikazu Sugiyama

Hiroyuki Mizukami

Akihide Okuda

Nobutaka Hotta

Ikuo Murata

Hiroyasu Ikedo

A portable device comprising: an inter-device communication transceiver configured to receive, from at least one subordinate portable device that operates in accordance with control performed by the portable device, a power transfer request signal with respect to the subordinate portable device; a power transfer control circuit configured to transfer power to the subordinate portable device; a battery; and a controller configured to control an operation of the inter-device communication transceiver and an operation of the power transfer control circuit. The controller is further configured to: when the inter-device communication transceiver receives the power transfer request signal, detect a battery residual amount; and perform control for causing the power transfer control circuit and the inter-device communication transceiver to output electromagnetic waves for wireless power transfer in accordance with a detection result of the battery residual amount.

Portable terminal apparatus and wireless power transmission method by portable terminal apparatus

An HMD includes first and second batteries mounted therein, and includes a plurality of power receivers that receive power from the first and second batteries by wireless transmission, a power supply manager that monitors states of the first and second batteries, a communication interface that performs wireless communication with the first and second batteries, and a plurality of limiters that limit the power received by the plurality of power receivers. A controller causes the limiters to limit power, which is supplied to a load, according to a power use state of the load in the device, and the power supply manager acquires information of remaining power storage amounts of the first and second batteries through the communication interface and displays the acquired information on a display. Therefore, since it is possible to supply power required for driving the device while wearing the HMD, the HMD can be continuously used.

Wearable device, battery used in the same, and power supply system

A wireless power transfer system includes a wireless terminal apparatus, a wireless power transmitter, and a wireless base station (a wide-area base station and a narrow-area base station). The wireless base station creates schedule information containing allocation of wireless resources regarding the wireless data communication and the wireless power transfer on the basis of grasp of a request of the wireless data communication and a request of the wireless power transfer from the wireless terminal apparatus, and transmits the schedule information to the wireless power transmitter and the wireless terminal apparatus. The wireless power transmitter executes the wireless power transfer to the wireless terminal apparatus in accordance with the schedule information. The wireless terminal apparatus receives the wireless power transfer from the wireless power transmitter in accordance with the schedule information, and executes the wireless data communication via the wireless base station.

Wireless terminal apparatus and wireless power transmitter

Provided is a power reception unit that receives electric power transmitted from a power transmission unit, in which variation in power transmission efficiency is prevented. The power reception unit includes: a plurality of power reception coils that are configured to receive electric power by magnetic coupling with a power transmission coil of the power transmission unit; and a load coil that is disposed close to the power reception coils, in which a plurality of series resonant circuits that resonate at a frequency equal to a power transmission frequency are constituted by each of the plurality of power reception coils and a resonance capacity, the plurality of series resonant circuits are connected in series in a loop shape, and the load coil extracts received electric power from the series resonant circuits.

Power reception unit, power transmission unit, and wireless power transfer device

An HMD includes first and second batteries mounted therein, and includes a plurality of power receivers that receive power from the first and second batteries by wireless transmission, a power supply manager that monitors states of the first and second batteries, a communication interface that performs wireless communication with the first and second batteries, and a plurality of limiters that limit the power received by the plurality of power receivers. A controller causes the limiters to limit power, which is supplied to a load, according to a power use state of the load in the device, and the power supply manager acquires information of remaining power storage amounts of the first and second batteries through the communication interface and displays the acquired information on a display.

Provided is a receiving device that without interrupting a program being viewed is capable of switching the channel to the program in a destination reception area. When reception is good, a plurality of receiving units select the same channel and receive a program; and when reception worsens, the plurality of receiving units is divided into units for program reception and units for channel searching. The receiving units for program reception continue receiving the program, and the receiving units for channel searching search for a relay station and switch to a relay station channel having better reception than the channel being viewed. In a case where a relay station channel with good reception cannot be found, series broadcast stations in the same network are searched and a switch is made to a channel of a series broadcast station in the same network that has better reception than the channel being viewed.

Receiving device

Receiver apparatus comprises: first and second receiving systems; a demodulation/diversity combining means for combining demodulated signals of first and second receiving systems; a selection means for selecting and outputting an output of either one of first and second receiving systems; and a control means for controlling the operations of the whole receiver apparatus. Control means causes to execute a first composite operation, either one of the receiving systems is caused to continue reception operation while the other receiving system is caused to perform channel search to search a channel satisfying a predetermined condition, further the selection means is caused to select output of the resulting receiving system for performing continuous reception operation. If no channel to be received is found, the control means controls to interchange the receiving system for performing continuous reception operation and the receiving system for performing channel search, and to perform a second composite operation.

Receiver apparatus for receiving a program and searching a channel simultaneously

The present invention provides a method for providing an optimal wireless communication method according to a change in a wireless communication environment. When the reception status is degraded while an HD stream signal, which uses a first wireless method, is transmitted and received, the method scans channels for which radar wave monitoring is not required and switches the transmission/reception to a second wireless method using free channel A. The method further scans channels for which radar wave monitoring is required and, if free channel B has a bandwidth wider than that of channel A is found, monitors channel B and if channel B is not used by a radar wave, switches the channel from channel A to channel B.

Transceiver

In a digital broadcasting receiving apparatus, channel selection that switches a physical channel requires a longer period of time than analog. To solve the above problem, for example, there are provided two systems each including a digital tuner and a decoder, wherein channel selection and decoding are carried out by a second tuner and decoder respectively, when the user carries out the channel selection operation. During this time, the first system continues decoding. At the moment when the user carries out the channel selection operation, the luminance is decreased to some extent to allow the user to intuitively know that the channel selection operation is started, and then the luminance is further decreased gradually. When the luminance reaches zero, the decoding is started in the second system, and then the system to display is switched.

Receiving apparatus and receiving method for channel switching in both digital and analog TV reception

In a receiving apparatus and a method for setting a receiving antenna thereof, for dissolving a problem of necessity of a large amount of time for channel search, since it needs a time for setting up the receiving antenna at each physical channel, in the channel search operation, including searching of receivable channels and also memorization of an optimal setup for each of the receiving channels, receiving conditions are obtained for all of the physical channels in each of the setups of receiving antenna, and this obtaining of the receiving condition is conducted on all of the setups of the receiving antenna. In that instance, a number of times of controlling the setup of receiving antenna is determined to be a number of combinations of the setups of receiving antenna, and thereby shortening the time necessary for the setup of the receiving antenna and the time necessary for channel preset.

Receiving apparatus and a method for setting a receiving antenna thereof

This invention relates to a digital broadcast receiver device capable of performing excellent reproduction equivalent to recording sessions in the case of receiving digital broadcast by handheld terminals or mobile/movable bodies, such as land vehicles, and then recording it in a storage device for reproduction. For example, when recording hierarchically transmitted digital broadcast on a recording medium, the reception quality is analyzed by a reception quality analyzer based on the information from a transmission path demodulator. A list generator generates a reception quality list from an analysis result from the reception quality analyzer and time information from a writing unit and then records it on the record medium. Upon playback from the record medium, the reception quality list is analyzed by a list analyzer. A selection instruction unit selects the optimum hierarchical service and then performs playback and display.

Digital broadcast receiving device and method

A digital broadcast channel reception system and a portable terminal allow watching a digital broadcast on the terminal. In the examples, a receiver unit for receiving digital broadcasts transmits video data to a display unit, using its TX data manipulator, modulator, TX circuit, and antenna. The TX data manipulator manipulates the output from an OFDM demodulator into data to transmit from the TX circuit and appends error correction codes to the data. The modulator modulates the output from the TX data manipulator. A display unit for digital broadcast display receives video data transmitted from the receiver unit, using its antenna, TX/RX section, and modulator/demodulator. After error correction codes in the received signals are decoded by a TX/RX data manipulator, video data is extracted. After the video data is decoded by a MPEG4 decoder, a picture is output on the display.

Digital broadcast channel reception system and method and portable terminal for use in such system

A multiplex transmission method using especially a vestigial-sideband amplitude-modulated carrier modulated by a video signal. The method includes modulating a carrier having a quadrature phase with respect to an amplitude-modulated carrier by a multiplex-transmitted signal such as a digital-coded signal with a lower level as compared with the amplitude-modulated carrier, suppressing signal components of a signal obtained by modulating the carrier by a multiplex-transmitted signal, which is located near the carrier frequency, combining the result with the amplitude-modulated carrier, and thereafter transmitting the combined signal.

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Chigasaki, Japan

Takatoshi Shirosugi