Asahi Kasei Emd Corporation

Mitsubishi Electric Corporation

Asahi Kasei Microdevices Corporation

Toru Kitamura

Masaya Yamashita

Munehiro Kitaura

Hitoshi Sadakuni

Manabu Yoshimura

Kenta Suzuki

Koichi Hikida

Norihiko Mikoshiba

Ryoko Sasahara

Masanobu Sato

A power conversion apparatus comprises a plurality of submodules and an insulating structure. The plurality of submodules are aligned in at least one of a first direction and a second direction orthogonal to the first direction. Adjacent two of the submodules are insulated from each other by the insulating structure.

Power conversion apparatus

A physical quantity data correcting device accurately and rapidly makes corrections of physical quantity data by appropriately controlling an approximate ellipsoid computing unit and/or a correction coefficient computing unit on the basis of a control parameter group. A physical quantity data acquiring unit acquires physical quantity data output from a physical quantity detecting unit that detects physical quantities. A data selecting unit selects the acquired physical quantity data. An approximate ellipsoid computing unit computes an approximate expression of an n-dimensional ellipsoid indicating a distribution shape obtained by distributing the selected physical quantity data in an n-axis coordinate space. A correction coefficient computing unit computes correction coefficients for correcting the computed n-dimensional ellipsoid to an n-dimensional sphere. A computation control unit controls the approximate ellipsoid computing unit and/or the correction coefficient computing unit on the basis of a control parameter group. A correction data output unit corrects the physical quantity data.

Physical quantity data correcting device and physical quantity data correcting method

The present invention relates to a physical quantity measuring instrument and signal processing method thereof capable of reducing noise components and improving reliability without increasing size or cost of the circuit. A physical quantity detecting unit () has signal detecting components for detecting a plurality of signals based on a desired physical quantity and detects the desired physical quantity. A signal processing unit () executes signal processing of the signals detected on the individual detecting axes by the physical quantity detecting unit () for linearly combining the signals in different combinations with time. An arithmetic processing unit () combines and calculates a plurality of signals based on the physical quantity associated with the physical quantity detecting unit () from the signal data output by the signal processing unit (). It can linearly combine the signals from the plurality of detecting axes in different combinations with time, output them, and obtain desired signal components whose noise components are reduced by calculating the outputs.

Physical quantity measuring instrument and signal processing method thereof

The present invention relates to a traveling direction measuring apparatus usable as a pedestrian navigation system in locations where it is difficult to obtain high positioning accuracy such as inside buildings or around multistory buildings where a GPS cannot be used. An acceleration detecting section (1) detects 3-axes acceleration of the traveling direction measuring apparatus, which varies with the walking of the pedestrian. An acceleration data acquiring section (2) obtains 3-axes acceleration data repeatedly by the number of prescribed times or more, said 3-axes acceleration data varies with the walking of the pedestrian. A first gravity acceleration calculating section (3) calculates, when the pedestrian is walking with holding the traveling direction measuring apparatus in a generally fixed attitude, gravity acceleration by averaging acceleration data sets during several steps obtained by the acceleration data acquiring section (2). A first moving direction estimating section (4) estimates the moving direction of the pedestrian from frequency components corresponding to the duration of one step of the acceleration data sets projected on a plane perpendicular to the gravity acceleration calculated by the first gravity acceleration calculating section (3).

Traveling direction measuring apparatus and traveling direction measuring method

A reference point defined on a two dimensional or three dimensional orthogonal coordinate space and scale reference of respective axes are estimated based on a distribution on the three dimensional orthogonal coordinate space at the time when respective axial components of an acceleration data group comprised of plural acceleration data including multi-axial components and a importance group pertaining to the acceleration data group, and the respective acceleration data are corrected based on the estimated reference point and scale reference of the respective axes.

Acceleration measuring device

A traveling direction measuring apparatus including 3-axes acceleration detecting means for detecting acceleration, and acceleration data acquiring means for repeatedly obtaining 3-axes acceleration data, said 3-axes acceleration varying with walking of a pedestrian, the traveling direction measuring apparatus including means for calculating, when the pedestrian is walking with holding said traveling direction measuring apparatus in a generally fixed attitude, gravity acceleration by averaging acceleration data sets during several steps obtained by said acceleration data acquiring means, means for calculating frequency components corresponding to duration of one step of the acceleration data sets projected on a plane perpendicular to the calculated gravity acceleration, and means for estimating a moving direction of the pedestrian seen from a terminal coordinate system associated with said traveling direction measuring apparatus according to frequency components.

An azimuth measuring device is provided that can obtain offset information when the direction of the azimuth measuring device is arbitrarily changed. The offset information is calculated based on coordinates of a reference point obtained by a reference point estimating system. The azimuth measuring device can obtain the offset information without obtaining erroneous offset information when changing direction.

Azimuth measuring device

There are provided an azimuth measurement device and its method for realizing an update of an offset calculated from the data acquired by azimuth measurement. A geomagnetism output measured by a 3-axis magnetic sensor is amplified and input to an A/D conversion section. A chopper section is arranged for switching the terminals for driving an X-axis, Y-axis and a Z-axis magnetic sensor and applies drive voltage output from a drive power source section to the X-axis, the Y-axis and the Z-axis magnetic sensor. The output amplified value amplified by the amplification section is converted from an analog signal to a digital signal by the ND conversion section and then is input to a sensitivity/offset correction calculation section. Output data from this sensitivity/offset correction calculation section is input to an azimuth calculation section and the corresponding azimuth information is output. A reliability information calculation section outputs reliability information.

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Tokyo, Japan

Toru Kitamura