Seiko Epson Corporation

Anand Kumar

Shunichi Mizuochi

Kenji Onda

Akinobu Sato

Rama Sanjay

Shuji Uchida

Tatsuya Ichikawa

Kazumi Matsumoto

Kazuto Mogami

Mahesh Inamdar

Aditya S Chikodi

A position calculation device includes an acceleration sensor and a gyro sensor to detect a movement of the user which is mounted on the body of the user, an arithmetic processing unit which executes setting a traveling direction axis by using a detection result of the sensor, using a change in a traveling direction of the user and correcting the traveling direction axis, and calculating a position based on the detection result of the sensor by using predetermined constraint condition based on the traveling direction axis.

Position calculation method and position calculation device

A traveling direction velocity calculation devicecalculates a posture of an acceleration sensorwith respect to a user, using a detection result represented in a local coordinate system associated with the acceleration sensor, detecting acceleration, which is worn on a user's body, when a change in the detection result of the acceleration sensorsatisfies a predetermined specific condition. The detection result of the acceleration sensorat a time different from that when the posture is calculated and at a time when the specific condition is satisfied is transformed, using the calculated posture, to a mobile body coordinate system associated with a user. A velocity in a traveling direction of the user is calculated using the transformed detection result.

Movement state information calculation method and movement state information calculation device

A new method for determining an attitude of a sensor with respect to a moving body is proposed. A movement vector is measured by a sensor mounted in the moving body. In addition, the attitude of the sensor with respect to the moving body is determined using the movement vector measured by the sensor when the moving body starts to move.

Attitude determination method, position calculation method, and attitude determination device

A satellite signal tracking method performed by a receiver that receives a satellite signal from a positioning satellite, the satellite signal tracking method including: computing a first Doppler frequency using a received signal obtained by receiving the satellite signal, computing a second Doppler frequency using the first Doppler frequency and a signal from the sensor unit including at least an acceleration sensor, and acquiring the satellite signal using the second Doppler frequency.

Satellite signal tracking method and receiver

In a position calculating device, a first operational process of calculating at least a position of a moving object using the measurement result of an inertial positioning unit disposed in the moving object is performed by a first operation processing unit. A second operational process of calculating the position of the moving object using the result of the first operational process and the measurement result of a satellite positioning unit disposed in the moving object is performed by a second operation processing unit. An operational coefficient of the first operational process is adjusted using the result of the first operational process and the result of the second operational process by an operational coefficient adjusting unit.

Position calculating method and position calculating device

A method of calculating the position of a moving body includes: detecting a movement direction of the moving body; calculating a velocity vector of the moving body using a detection result of an acceleration sensor installed in the moving body; correcting the velocity vector using the movement direction; and calculating the position of the moving body using the corrected velocity vector.

A satellite signal tracking method includes: detecting a situation of movement; calculating an error of the detection; and setting a loop bandwidth of a tracking filter, which is used to track a satellite signal received from a positioning satellite and of which the loop bandwidth can be changed, using the detection result and the calculated error.

Satellite signal tracking method, position calculating method, and position calculating device

An audio data processing device including: a first processor; and a second processor which is connected to the first processor wherein the first processor includes: an audio data acquisition which acquires audio data of digital data; an omitting section which omits a bit corresponding to low volume which is hard to be heard by human ears from the audio data; and a transmitter which transmits the audio data in which the bit corresponding to the low volume is omitted by the omitting section from the first processor to the second processor; wherein the second processor includes: a receiver which receives the audio data transmitted from the first processor; and a reproduction data generator which generates audio reproduction data necessary to reproduce the audio data based on the received audio data.

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Richmond, CA, United States of America

Anand Kumar