Rohm Co., Ltd.

The University of Tokyo

Hideki Nishiyama

Tadashi Kobayashi

Masafumi Seike

Atsushi Momota

Senshi Fukashiro

Yoshiro Fujii

Akihiro Okui

Hiroaki Sano

Takeshi Kuga

Tengai Kubo

This position detection system comprises a mobile station that transmits a beacon signal, a plurality of fixed stations that receive the beacon signal, and a position analysis device that acquires position information for the mobile station by estimating the position of the mobile station from the reception intensities of the beacon signal at each fixed station. The mobile station includes a movement detection unit (acceleration sensor, geomagnetic sensor, etc.) that determines when movement has stopped. While the movement of the mobile station has stopped, the position analysis device stops estimating the position of the mobile station and keeps the position information at a fixed position.

Position detection system

In this azimuth angle sensor, original magnetic detection data is sequentially acquired as data points in a triaxial coordinate system by detecting magnetism on three axes. An offset derivation device provided to the azimuth angle sensor derives offset values for correcting the original magnetic detection data and generating corrected magnetic detection data. The offset derivation device uses a plurality of data points in the original magnetic detection data or in the corrected magnetic detection data to derive provisional offset values, then derives the magnitude of magnetism on such an occasion on the basis of the original magnetic detection data and the provisional offset values. When the magnitude of magnetism thus derived is within a predetermined correction success range, the offset values are updated using the provisional offset values. When the magnitude of magnetism thus derived is not within the predetermined correction success range, the offset values are not updated.

Offset derivation device, offset calculation device, and azimuth sensor

A subject performs a sit-to-stand operation while wearing a device (SU) that contains an acceleration sensor () on the front of the chest. The present invention derives a muscular strength index representing the muscular strength of a human body by obtaining maximum acceleration value data from a signal expressing the size of an acceleration vector comprising a tri-axial component in detected acceleration, and using the maximum acceleration value data and the muscle mass or body fat mass of the subject. The present invention has the ability to derive a physical activity amount from the acceleration detection results, and on the basis of the activity amount (ACT) during a prescribed activity target period and the muscular strength index at the start and end times of the activity target period, obtains an activity efficiency index that corresponds to changes in the muscular strength index in response to the amount of activity.

Index deriving device, wearable device, and mobile device

For triaxial magnetic detection data sequentially acquired as data points in a triaxial coordinate system, an offset calculation unitcalculates virtual data points P'-P&#x2032; by evenly parallel-translating each of data points P-Pso that a reference data point P, for example, arbitrarily chosen from the data points P-Pcoincides with an origin point O. A virtual offset point C&#x2032; for which the sum of the distances between the virtual data points P&#x2032;-P&#x2032; and a curved surface Hpassing through the origin point O is minimized is then calculated. An offset value C for the magnetic detection data is then calculated by parallel-translating the virtual offset point C&#x2032; so as to restore the parallel-translated portion.

Offset calculation device and azimuth sensor therewith

The present invention involves a test subject performing a sit-to-stand (STS) operation while wearing a device (MD) that contains an acceleration sensor () on the front of the chest. The present invention derives a muscular strength index (maximum acceleration value per unit of muscle mass during STS activity) representing the muscular strength of a human body by obtaining maximum acceleration value data from a signal expressing the size of an acceleration vector comprising a tri-axial component in detected acceleration, and using the maximum acceleration value data and the muscle mass or body fat mass of the text subject.

An abnormality detection apparatus () is configured to detect an abnormality of a lighting device (). The abnormality detection apparatus () includes an illuminance sensor (), a memory () and a controller (). The controller () is configured to detect the abnormality of the lighting device () based on a criterion stored in the memory () and a difference between an illuminance detected by the illuminance sensor () during on state of the lighting device () and an illuminance detected by the illuminance sensor () during off state of the lighting device ().

Abnormality detection apparatus and notification apparatus

A user interface device includes: a proximity sensor configured to detect proximity of a user; an electrostatic switch configured to detect capacitance changes of a plurality of electrodes; an acceleration sensor configured to detect an acceleration; and a microcomputer configured to control supply of electric current to the electrostatic switch and the acceleration sensor based on a detection result of the proximity sensor, and recognize a plurality of user operations based on detection results of the electrostatic switch and the acceleration sensor.

User interface device and electronic device including the same

An oscillator of the present invention includes a constant current circuit in which a constant current generated in the constant current circuit varies positively with an on threshold voltage of a transistor included in the constant circuit; and an oscillating circuit in which the oscillating frequency of a clock signal generated in the oscillating circuit varies positively with the constant current supplied from the constant current circuit, and the oscillating frequency of the clock signal generated in the oscillating circuit varies negatively with an on threshold voltage of a transistor included in the oscillating circuit.

Growing community of inventors

Kyoto, Japan

Hideki Nishiyama