| 摘要 |
To enable accurate body motion detection of a user according to the direction of body motion of the user (movement direction) without being affected by the wearing position and wearing direction of the device main unit. A control unit 110 performs computation processing of acceleration vectors which are detection output from a tri-axial acceleration sensor 101, and calculates an acceleration-of-gravity vector. A vertical component included in the acceleration vector is extracted by predetermined computation processing taking into consideration the calculated acceleration-of-gravity vector and the acceleration vector. The vertical direction body motion of the user can be accurately detected by analyzing the vertical component.
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