Kabushiki Kaisha Toshiba

Hideki Aisaka

Buntarou Sawa

Eiji Saruwatari

Masanori Niwa

According to one embodiment, an information processing system includes a first electronic device, a second electronic device connectable with the first electronic device, and a security lock. The security lock is configured to attach to the second electronic device when the first electronic device and the second electronic device are connected with each other, the security lock for preventing the second electronic device from being stolen, and in association with the security lock, a first lock for preventing separation of the first electronic device from the second electronic device.

Information processing system, electronic device, and method with device theft prevention capabilities

A plurality of amplifiers corresponding to a plurality of types of transmitting signals are provided to amplify the transmitting signals to a power level at which they can be transmitted by radio. The amplifiers are driven by both power and a bias. The bias is supplied to one of the amplifiers that amplifies a to-be-transmitted transmitting signal.

Mobile radio apparatus and radio unit

When an antenna switching unit selects a first antenna and a reference gain does not exceed a first limit value, a gain of a variable amplifier is set to the reference gain. When the antenna switching unit selects the first antenna and the reference gain exceeds the first limit value, the gain of the variable amplifier is set to the first limit value. When the antenna switching unit selects a second antenna and the reference gain does not exceed a second limit value, the gain of the variable amplifier is set to the reference gain. When the antenna switching unit selects the second antenna and the reference gain exceeds the second limit value, the gain of the variable amplifier is set to the second limit value.

Radio communication apparatus and transmission power controlling apparatus

A plurality of detectors each output a detection signal corresponding to an output power of a corresponding one of a plurality of transmitting units. The detection signal passes through a corresponding one of a plurality of rectifiers each corresponding to the associated detector and is inputted to an input terminal of a smoothing device to allow the detection signal to be smoothed.

Transmission power detecting apparatus and transmission apparatus

An automatic power control (APC) circuit for use with a radio telecommunication apparatus. The apparatus transmits radio frequency signals at a power level prescribed by a level control signal. In the automatic power control circuit, transmission power level is detected from the output of a duplexer. Accordingly, even if signal loss in a filter of the duplexer varies on the frequency of signals passing therethrough, transmission power level is accurately detected and the detected level is feedbacked to an amplifier of the APC circuit.

Automatic power control circuit for use with a radio telecommunication

A portable telephone apparatus which is capable of being selectively connected to an adaptor unit for transmitting a radio frequency (RF) signal at a certain power level in response to a level control signal. The telephone apparatus includes an amplifier for amplifying the RF signal by a predetermined amplification factor and an antenna for radiating the amplified RF signal. An operator actuatable switch is coupled to the output of the amplifier and is selectively coupled to the antenna and the adaptor unit. A control device is coupled to the amplifier and the operator actuatable switch and is responsive to the level control signal for controlling the amplifier so that the amplification factor of the amplifier is fixed to a predetermined level when the operator actuatable switch is in a first state and to a variable level when the actuatable switch is in a second state.

Growing community of inventors

Hino, Japan

Hideki Aisaka