Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Kazuhiko Ikeda

Kenichi Nakano

Taro Ura

Keiichi Zenmyo

Atsushi Yamamoto

Kaoru Ishida

Hisashi Adachi

Hiroaki Kosugi

Takashi Enoki

Hiroshi Haruki

Hiroyuki Tani

Yoichiro Ueda

Shoichi Kajiwara

Koji Ishii

Takayoshi Morino

Kenji Sakanashi

Kouta Okada

Toshihiro Nagayama

Hirofumi Kosaka

Takashi Izumi

Kazuhiko Takeyama

Junichi Yasuno

Takayoshi Murahashi

Tetsuya Matsuoka

An amplifying method and apparatus generates a plurality of constant envelope signals from an input signal and generates a plurality of pilot signals associated with the generated plurality of constant envelope signals, respectively. The plurality of pilot signals have predetermined amplitudes, predetermined phases, and predetermined frequencies, respectively, and the phases and frequencies are different from each other. The plurality of pilot signals are added to the generated plurality of constant envelope signals, and the sum is amplified. An amplitude or phase of one of the generated plurality of constant envelope signals is corrected using signal components included in the amplified plurality of constant envelope signals.

Amplifier circuit and amplifying method

In order to direct a probe having directivity that a received band is widened in accordance with a measurement distance, toward a DUT, shift the received band of the probe in sequence, receive electromagnetic, and measure electromagnetic interference, a plurality of long and short measurement distances between the probe and the DUT are set, and measurement at the long measurement distance and measurement at the short measurement distance are performed plural times. Herein, the measurement at the short measurement distance is performed on a received band where electromagnetic interference is measured by the measurement at the long measurement distance. Thus, measurement of electromagnetic interference can be performed with high accuracy in a short time.

Method and apparatus of electromagnetic measurement

A gain of a receiving amplifier can be measured by inputting pilot signals each having a different frequency into an input side and an output side of the receiving amplifier respectively, then detecting these pilot signals respectively by a main apparatus having an abnormality detecting function, and then comparing their relative values.

Receiving apparatus, base station apparatus using same and radio communication system

The present invention concerns a radio circuit including a local oscillator, a first receive frequency converter, a frequency divider and a demodulator. A receive signal and an output of the local oscillator are input to the first receive frequency converter. The receive signal is converted into a first intermediate signal by the first receive frequency converter, and the first intermediate frequency signal is input to the demodulator. The output of the local oscillator is frequency-divided by the frequency divider and also input to the demodulator. The signal converted into the first intermediate frequency is demodulated into a baseband signal by the demodulator.

Radio circuit having a local oscillator frequency which differs from the transmit frequency or the receive frequency and mobile radio apparatus

In a vehicle navigator using an acceleration sensor for detecting a running distance, the precision of measuring the running distance is intended to be improved. Output data of the acceleration sensor during a predetermined time duration is stored in an output storage, and the average value or 'mean acceleration' of output data is calculated by a mean acceleration calculator A running distance calculator calculates a difference between the acceleration measured with the acceleration sensor and the mean acceleration calculated by the mean acceleration calculator, and this difference is double integrated to obtain the running distance.

Vehicle navigator for calculating distance based on mean acceleration

The present invention relates to a navigation sppratus for finding a vehicle location by calculating on the basis of an output data of an acceleration detecting means for detecting a vehicle acceleration. The navigation apparatus provides at least one acceleration detecting means for detecting a vehicle acceleration and stop judge means for judging a vehicle stopping state from the output variation of the acceleration detecting means.

Navigation apparatus for a vehicle

A vehicle navigator for calculating a running distance of a vehicle from output data of an acceleration sensor, an increase of accumulated errors during the calculation of the vehicle running distance being suppressed. The vehicle navigator has an acceleration sensor for detecting an acceleration of the vehicle; a velocity calculator for calculating a first velocity of the vehicle on the basis of an acceleration detected by the acceleration sensor; a GPS receiver for receiving radio waves from artificial satellites and obtaining a second velocity; a velocity correcting unit for correcting the first velocity by using the second velocity; a running distance calculator for calculating the running distance of the vehicle from the velocity corrected by the velocity correcting unit; and a velocity limiter for setting a velocity limit value range relative to the first velocity if the second velocity cannot be obtained from the GPS receiver, in order to control the first velocity so that it does not exceed the velocity limit value range.

Vehicle navigator

Growing community of inventors

Ishikawa, Japan

Kazuhiko Ikeda