Mobile Device, Step Counting Method, and Gravity Direction Detecting Method
First Claim
1. A mobile device comprising:
- an acceleration detecting portion to detect accelerations in three directions different from each other;
a gravity direction detecting portion to detect a gravity direction on the basis of said detected accelerations in the three directions;
a gravity direction acceleration calculating portion to calculate an acceleration in said detected gravity direction on the basis of said detected accelerations in the three directions; and
a step counting portion to count the number of steps on the basis of said calculated gravity direction acceleration.
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Accused Products
Abstract
In order to count the number of steps without involving an increase in circuit size or in computational load, a mobile phone includes a three-axis acceleration sensor to detect accelerations in three directions of X axis, Y axis, and Z axis, which are different from each other, a gravity direction detecting portion to detect a gravity direction on the basis of the detected accelerations in the three directions, a gravity direction acceleration calculating portion to calculate an acceleration in the detected gravity direction on the basis of the detected accelerations in the three directions, and a step counting portion to count the number of steps on the basis of the calculated gravity direction acceleration.
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Citations
16 Claims
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1. A mobile device comprising:
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an acceleration detecting portion to detect accelerations in three directions different from each other; a gravity direction detecting portion to detect a gravity direction on the basis of said detected accelerations in the three directions; a gravity direction acceleration calculating portion to calculate an acceleration in said detected gravity direction on the basis of said detected accelerations in the three directions; and a step counting portion to count the number of steps on the basis of said calculated gravity direction acceleration. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile device comprising:
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three acceleration detecting portions to detect accelerations in three directions, respectively, the three directions being different from each other; an acceleration calculating portion to calculate averages of accelerations in a plurality of predetermined directions, respectively, for a predetermined period on the basis of said detected accelerations in the three directions; and a determining portion to determine a direction among said predetermined directions in which said calculated average acceleration takes a value closest to the gravitational acceleration to be a gravity direction.
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8. A mobile device comprising:
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an acceleration detecting portion to detect an acceleration; a gravity direction detecting portion to detect a gravity direction on the basis of said detected acceleration; a gravity direction acceleration calculating portion to calculate an acceleration in said detected gravity direction on the basis of said detected acceleration; and a step counting portion to count the number of steps on the basis of said calculated gravity direction acceleration. - View Dependent Claims (9)
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10. A step counting method comprising the steps of:
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detecting accelerations in three directions different from each other; detecting a gravity direction on the basis of said detected accelerations in the three directions; calculating an acceleration in said detected gravity direction on the basis of said detected accelerations in the three directions; and counting the number of steps on the basis of said calculated gravity direction acceleration. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A gravity direction detecting method comprising the steps of:
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detecting accelerations in three directions different from each other; calculating averages of accelerations in a plurality of predetermined directions, respectively, for a predetermined period on the basis of said detected accelerations in the three directions; and determining a direction among said predetermined directions in which said calculated average acceleration takes a value closest to the gravitational acceleration to be a gravity direction.
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Specification