Sony Corporation

Masataka Wakamatsu

Kazuhisa Takamura

Takeshi Yamaguchi

Hideaki Sato

Takashi Usui

Kenji Komori

Shinichi Tanabe

Hideo Morohashi

Kenji Shiba

Kazuyuki Saijo

Kazuhiro Fujimura

Kengo Sawada

Shyunji Maeda

The present invention is applied to a portable personal computer or the like having a plurality of wireless communication means, for example, so as to provide a user with appropriate wireless communication means in a situation where a plurality of wireless communication means are available. According to the present invention, the wireless communication means is selectively used in accordance with an application program with reference to a communication management table in which at least wireless communication means allowed to be used is described with regard to respective application programs.

Portable information terminal, a control method for a portable information terminal, a program of a method of controlling a personal information terminal and a recording medium having recorded therein a program of a method of controlling a personal information terminal

A transmission device includes a transmission power setting unit that respectively sets a transmission power for transmitting a main sound signal indicating a main sound and transmission powers for transmitting one or two or more subsidiary sound signals which pertain to the main sound signal and which realize a predetermined sound effect, and a first communication unit that respectively transmits the main sound signal and the one or two or more subsidiary sound signals on time division channels using the same frequency band, based on the transmission powers set by the transmission power setting unit, wherein the transmission power setting unit sets the transmission power for the main sound signal to a first reference value, and sets the transmission powers for the subsidiary sound signals to a second reference value smaller than the first reference value.

Transmission device and transmission method

There is provided a power transmitting apparatus including a power transmission side communication unit for communicating with a power receiving apparatus, a power transmission unit for transmitting power to the power receiving apparatus in a non-contact manner, a transmission power information deriving unit for increasing discretely a first transmission power to transmit from the power transmission unit to the power receiving apparatus, and deriving information related to power transmission for determining a second transmission power corresponding to power desired by the power receiving apparatus based on reception of received power information transmitted from the power receiving apparatus at the power transmission side communication unit, indicating that a received power level meet a predetermined level, and a transmission power determining unit for determining the second transmission power to transmit to the power receiving apparatus based on information related to power transmission derived by the transmission power information deriving unit.

Power transmitting apparatus, power receiving apparatus, power transmission method, program, and power transmission system

[Object] To ensure a maximum data transfer rate to achieve an improvement in throughput. [Solving Means] A CPUdetermines whether or not time-dependent interference is present during communication with a communication partner. When it is determined that time-dependent interference is present, a PHY mode to be used in each zone is determined for each communication partner on the basis of transmission line state information or packet error detection information received via a CPU I/F register, and is set in a PHY mode tablethrough a CPU bus. A selectorselects a PHY mode to be used during the current transmission from the PHY mode tableon the basis of a destination ID of a communication partner and zone information (count value of a TimeZone counter) involved in next sending or reception, and sets the PHY mode in a packet composition/decomposition processing unit

Communication apparatus, transmission scheme setting method, program, and radio communication system

There is provided a power transmitting apparatus including a power transmission side communication unit for communicating with one or more power receiving apparatus for receiving transmitted power; a power transmission unit for transmitting power to the one or more power receiving apparatus in a non-contact manner; an allocating unit for dividing transmission of power from the power transmission unit to the power receiving apparatus to a plurality of dividing periods for every predetermined period, and allocating the one or more power receiving apparatus to one of the dividing periods; and a power transmission control unit for selectively transmitting power to the one or more power receiving apparatus for every dividing period based on the allocation result in the allocating unit.

Power transmitting apparatus, power transmission method, program, and power transmission system

There is provided a power transmission device including a communication part that performs communication with an external power transmission device that transmits power, a power transmission part that transmits power to a power receiving device that receives the transmitted power in a non-contact manner, a determination part that determines whether power can be transmitted, based on external power transmission information received by the communication part indicating a start of power transmission by the external power transmission device, and a power transmission control part that controls the power transmission part to selectively transmit power based on a determination result from the determination part.

Power transmission device, power transmission method, program, power receiving device and power transfer system

The present invention provides an information processing system enabled to transmit and receive video mails at a higher transfer rate and at reduced cost. In this system, a file server sends a low capacity notification mail, which notifies the presence of a video mail sent from a portable terminal, to another portable terminal. This portable terminal accesses the file server in response to the notification mail, and downloads the video mail therefrom via a WLAN network that is a broadband communication line.

Information processing system, information processor, information processing method, receiver, receiving method, and program

In order to make it possible for almost all of wireless terminals to operate intermittently without generating any conflicts in communication, and thereby, to achieve lower power consumption and transmission/reception of data pertaining to a wireless terminal immediately after a return from its power save state with top priority, mobile stations other than a first mobile station may be put in their power save states, while a return timing from the power save state of each of the mobile stations is intentionally shifted by a base station so as not to overlap in time. In addition, the base station performs polling on a mobile station returned from its power save state is polled with top priority so that transmission/reception of data pertaining to the mobile station is carried out between the mobile station and the base station within a CFP.

Wireless terminal management method, base station and wireless terminal management program

An automatic gain control circuit able to perform high speed and correct level acquisition, able to prevent occurrence of error, and able to prevent a crash of the system. An amplification gain controller outputs a gain control signal to an automatic gain control amplifier to amplify the received signal with maximum value when receiving a burst detection trigger signal. A second gain control signal based on the detected reception signal power is calculated when receiving a first burst synchronization detection signal; and this second gain control signal is output to the automatic gain control amplifier. A received digital signal is amplified with the second gain and integrated to find the reception signal power, from which a third gain control signal is calculated and outputted to the automatic gain control amplifier to amplify the received signal with this third gain.

Automatic gain control circuit and method thereof and demodulation apparatus using the same

A demodulation timing generation circuit capable of generating correctly and with high precision a timing for demodulating a reception signal even under various kinds of reception conditions and a demodulation apparatus using the same, wherein AGC control and frequency offset correction are performed by the burst detectorand the amplification gain controllerusing a synchronization training signal (burst signal) added to the head of the reception signal (packet), a detection window period is provided for cross-correlation detection to detect the peak of the cross-correlation in the detection window DW by the timing controller, and in the end (rear edge) of the window, data corresponding to the peak position is loaded in the counterfor counting the OFDM symbol interval. Due to this, it is possible to set an optimal FFT timing irrespective of the condition of a channel.

Demodulation timing generation circuit and demodulation apparatus

A carrier reproducing apparatus and method enabling stable operation even at a low S/N, wherein, when phase signals are locked and exceed a predetermined value, a tracking circuit generates a signal and an oscillation frequency of a signal output from a numerical control oscillation circuit is controlled so that the phase signals do not exceed the predetermined value and wherein a down sampling circuit and an interpolation circuit convert signals having a frequency of more than twice the symbol rate to signals having a frequency of twice the symbol rate.

Carrier reproducing apparatus and method of the same

Upon the power-on, a digital signal processing circuit supplies an AGC signal to an AGC amplifier to squelch it substantially, thereby prohibiting an analog signal from being input to an A/D converter 6 via a DC level setting circuit. In this state, a DC level that is set by the DC level setting circuit is A/D-converted by the A/D converter and a resulting value is input to the digital signal processing circuit. The digital signal processing circuit calculates and stores, as a DC offset value, a difference between the received DC level and the center value of the dynamic range of the A/D converter. In a stationary state, the AGC amplifier is caused to operate normally and the offset value is subtracted from data that is supplied from the A/D converter. Resulting data is output from an output terminal.

Apparatus and method for detecting and compensating for an offset while

A demodulator and a demodulation method are designed so as to reduce the load of a CPU. A host CPU controls a digital demodulation circuit, an error correction circuit, a transport circuit and an MPEG decoder through a bus. The host CPU outputs a control signal to a format conversion circuit via a CPU interface when it instructs a tuner to perform tuning. The format conversion circuit converts the format of this control signal into a 3-wire format and outputs the converted signal to a frequency divider of the tuner.

Digital communication demodulator, digital communication demodulation

Survivor sequences information is supplied to a RAM 61-1 and a RAM 61-2 as an input Din. The RAM 61-1 and the RAM 61-2 perform an interleaving operation and store the survivor sequences information alternately in accordance with a clock CK1 and a clock CK2 differing in phase from the clock CK1 by half a period. The phases of the clock CK1 and the phase of the clock CK2 are delayed by half a period when a write operation is switched to a read operation with data being outputted at a selector 62 in an appropriate order accordingly. Traced-back data is then inputted from terminal A and terminal B to the selector 62 and outputted from a terminal X after one of these items of data has been selected at a prescribed timing.

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Kanagawa, Japan

Masataka Wakamatsu