Patent ID: 8373658
Filing Date: 2013-02-12
Classification: G06F

Abstract:
1. A motion sensing system comprising; a motion sensing device having three perpendicular axes, a pointing direction along a first axis of the three perpendicular axes, and only two rotational sensors arranged to form a non-zero acute angle between a second axis of the three perpendicular axes and an axis of a first of the rotational sensors, a 3-axis accelerometer having the axes aligned with the three perpendicular axes, and a first microprocessor coupled to receive output from the 3-axis accelerometer and output from the two rotational sensors; and a receiver device, the receiver device comprising a wireless receiver and a second microprocessor, wherein the second microprocessor generating rotational data around 3 axes of the motion sensing device according to the non-zero acute angle, the second microprocessor calculating 3-axis angular speeds of the motion sensing device according to where “W” is the angular speed, “α” is the acute angle, and “θ” is the tilt angle θ.