Sony Corporation

Norio Shimo

Tomoya Yamaura

Atsushi Yoshizawa

Hideaki Sato

Shinichiro Tsuda

Sachio Iida

Hisaki Hiraiwa

Norio Numata

Sei Suzuki

An information processing apparatus includes a receiver configured to receive designation information corresponding to a user operation for designating an area for which an index indicating a degree of human congestion is to be displayed and a controller configured to perform control to provide a degree of communication traffic in the area as the index for the area.

Information processing apparatus, communication system, and information processing method

A transmitting apparatus which can suppress unnecessary power consumption. An optimal signal line is selected from a plurality of signal lines (53-56) having different gains provided by respective signal amplifying device to perform gain adjustment on a signal to be transmitted, which is supplied to an input terminal (58), so as to optimize power consumption of each signal amplifying device in accordance with a gain value, and to halt the operation of the signal amplifying device on a signal line which is not selected. Therefore, unnecessary power consumption can be suppressed.

Transmitting apparatus and method of adjusting gain of signal to be

A transmitting apparatus which can suppress unnecessary power consumption. An optimal signal line is selected from a plurality of signal lines (53-56) having different gains provided by respective signal amplifying devices to perform gain adjustment on a signal to be transmitted, which is supplied to an input terminal (58), so as to optimize power consumption of each signal amplifying device in accordance with a gain value, and to halt the operation of the signal amplifying device on a signal line which is not selected. Therefore, unnecessary power consumption can be suppressed.

A portable radiocommunication apparatus on a time division multiplex communication system includes a power amplifier circuit, signal processing circuit, battery, stepping up circuit, storing circuit, and a switch circuit. The power amplifier circuit amplifies a transmitted signal intermittently transmitted at predetermined periods to a radio transmission power level. The signal processing circuit is operated by a voltage lower than the operating voltage of the power amplifier circuit. The battery is for example a battery constituted of a lithium ion battery, of which the unit cell has a full-charged voltage lower than the operating voltage of the power amplifier circuit and an ultimate voltage higher than the operating voltage of the signal processing circuit, with a large voltage difference between the full-charged voltage and the ultimate voltage. The stepping up circuit is a circuit with small output current capacity, operating at the voltage within the range changing from the full-charged voltage to the ultimate voltage of the battery, amplifies the output voltage of the battery at least to the operating voltage of the power amplifier circuit. The storing circuit stores power of which the voltage is stepped up by the stepping up circuit. The switch circuit is provided between the storing circuit and the power-supply terminal of the power amplifier circuit and supplies the stored power in the storing circuit to the power amplifier circuit only while the power amplifier circuit is amplifying the transmitted signal in substance.

Variable power circuit and apparatus using the power circuit

A time division multiplex transmitting/receiving system converts a signal to be transmitted into a signal having a predetermined frequency in a predetermined time slot, which is transmitted as a transmission signal, and receives a transmitted signal having a frequency different from the frequency of the transmitted signal at another time slot different from the time slot of the predetermined frequency, and for demodulating this received signal. The time division multiplex transmitting/receiving system includes a fixed oscillator, a variable oscillator, a mixer, a modulator, a converter, a frequency divider, and a demodulator. The fixed oscillator outputs a first signal having a constant frequency. The variable oscillator outputs a second signal having a predetermined frequency within a predetermined band range. The mixer mixes the first signal with the second signal. The modulator directly modulates a signal to be transmitted by employing the mixed signal. The converter converts the received signal into the intermediate signal by employing the mixed signal. The frequency divider frequency-divides the first signal outputted from the fixed oscillator. The demodulator demodulates the intermediate frequency signal outputted from the converter with using the output from the frequency divider.

Time division multiplex transmitting/receiving system

A bias control circuit for a radio-frequency power amplifier which performs linear power amplification of an intermittent radio-frequency signal. The control circuit includes a bias voltage setting circuit for supplying a bias voltage of a predetermined value to a power amplifying element during a time period in which substantially none of the radio-frequency signal is supplied to the power amplifying element, and for setting the idle current of the power amplifying element to a predetermined value. The control circuit further includes a sample and hold circuit for sampling and holding the bias voltage during the time period in which substantially none of the radio-frequency signal is supplied to the power amplifying element. The output voltage of the sample and hold circuit is supplied as a bias voltage to the power amplifying element during the subsequent time period of supply of the radio-frequency signal to the power amplifying element, whereby the idle current of the power amplifying element is stabilized despite any temperature fluctuation.

Bias control circuit for radio-frequency power amplifier

A signal switching apparatus for switching between a 1/4 wavelength transmission line, which transmits a transmission signal, and a 1/4 wavelength reception line, which receives a reception signal, which share a common antenna. The apparatus sets the characteristic impedance of one of the 1/4 wavelength lines to be zero while the other 1/4 wavelength lines is set to infinity so that the switching operation can be effected without passing the transmission and reception signals through semiconductor switches.

Signal transmission reception switching apparatus

An intermittently driven transmitter having high power output which is driven intermittently so as to transmit a signal via, for example, a satellite in which the voltage supplied to the transmitter is boosted and supplied to a capacitor. When the signal is to be transmitted, the voltage stored on the capacitor is supplied to a constant voltage circuit which generates a constant voltage which is higher than the voltage supplied to the transmitter and which is supplied to a power amplifier in the final stage of the transmitter and, thus, the intermittent type transmitter with a suitable battery drive system is obtained.

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Kanagawa, Japan

Norio Shimo