Kabushiki Kaisha Toshiba

Hitachi-kokusai Electric Inc.

Sony Corporation

Toshio Takada

Naoki Hongo

Masaki Suto

Yoichi Okubo

Masato Horaguchi

Yuji Hirooka

Kiyoshi Funada

Tetsuhiko Miyatani

Shinji Saito

Takashi Koyama

Osamu Kondo

Jun Ishii

Masahiko Kashiwabara

Akihiko Konno

Takashi Uchida

Yasushi Fukuoka

Manabu Tago

Shuhei Miura

Kazuyoshi Sato

Koji Nakashima

Yasuo Sera

Hidefumi Ito

Ken Tomonaga

Electronic computer

An information processing apparatus includes: an analysis means for analyzing a code stream in which picture data is encoded during transmission; a dividing position determination means for determining a dividing position of the code stream in accordance with a picture size of the picture data based on an analysis result by the analysis means; and a decoding means for decoding code streams in plural units of division in parallel, which are obtained by the code stream being divided at the dividing position determined by the dividing position determination means.

Information processing apparatus and method

Arithmetic operation control machine for computer

Telephone line connection transponder

Telephone set

A distortion compensator compensates for distortion arising in an amplifier that amplifies a signal with improved efficiency. The distortion compensator includes a signal level detector which detects the level of a signal to be amplified by an amplifier, a distortion compensation execution unit which executes distortion compensation on the signal to be amplified according to a mode of distortion compensation corresponding to the signal level detected by the signal level and a correspondence between signal levels and distortion compensation control values as pairs, a distortion compensation control value correspondence updater which updates the correspondence between the signal levels and the distortion compensation control values used in the execution of distortion compensation, and a distortion compensation control value number controller which controls the values of stipulated parameters.

Distortion compensator

A distortion compensator for compensating for distortion produced in an amplifier that amplifies a signal includes a signal level detector for detecting a level of a signal to be amplified and a distortion compensator for conducting distortion compensation based on the detection result separately for each frequency band signal of multiple frequency band signals contained in the signal to be amplified. The distortion compensator improves distortion compensation performance by reducing the effect of frequency characteristics that restrict the distortion compensation performance limit.

A peak limiter for use in a system for amplifying a multi-carrier signal receives a baseband signal of each carrier of the multi-carrier signal. The multi-carrier signal is computationally estimated to have carriers combined in an RF band, and obtains power information of the multi-carrier signal to limit an amplitude of the baseband signal based on the power information of the estimated multi-carrier signal to thereby provide peak-limited baseband signals. Thus, the distortion generated by performing the unnecessary peak limitation can be effectively prevented to thereby improve the reliability of the entire system.

Peak limiter and multi-carrier amplification apparatus

To update the control value to a value of higher precision in a predistortion type distortion compensation apparatus for compensating the distortion occurring in an amplifier for amplifying an input signal by the control using a control value corresponding to the level of the input signal. Distortion generating means () generates distortion in an input signal, input signal level detecting means () detects the level of the input signal, distortion control means () controls the distortion generated by the distortion generating meansby using a control value corresponding to the level of the detected input signal, distortion component level detecting means () detects the level of distortion component contained in the amplified signal issued from the amplifier (), integrating means Kto KN integrate the level of the distortion component detected at every level of the detected input signal, and control value updating means () updates the control value corresponding to the level so that the integration result at every level of the input signal may be small.

Predistortion type distortion compensation apparatus

Growing community of inventors

Tokyo, Japan

Toshio Takada