Patent ID: 7424388
Filing Date: 2008-09-09
Classification: A63F

Abstract:
1. A motion determining apparatus for determining a motion of an input device including an acceleration sensor for detecting an acceleration in each of at least two axial directions, the motion determining apparatus comprising: data obtaining programmed logic circuitry for obtaining acceleration data which is output from the acceleration sensor; rotation motion determination programmed logic circuitry for determining a rotation motion of the input device around a predetermined direction as a rotation axis, by comparing a start point in a two-dimensional coordinate system which is represented by the first acceleration data obtained in a predetermined period, and an end point in the two-dimensional coordinate system which is represented by the last acceleration data obtained in the predetermined period, wherein coordinate axes of the two-dimensional coordinate system are defined based on components of the two axial directions of the acceleration data, and an origin of the two-dimensional coordinate system represents a value of the acceleration data in the state where no acceleration including the acceleration of gravity acts upon the acceleration sensor; and an output for outputting motion data including at least the rotation motion determined by the rotation motion determination programmed logic circuitry.