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Pointer and controller based on spherical coordinates system and system for use

  • US 20110109545A1
  • Filed: 11/16/2009
  • Published: 05/12/2011
  • Est. Priority Date: 11/02/2004
  • Status: Active Grant
First Claim
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1. A wireless hand-held pointing device for manipulating an object on a display, the pointing device comprising:

  • an accelerometer responsive to tilt of the pointing device in a plurality of axes wherein;

    the tilt signals are measured as a response of the projection of static gravity on the tilted accelerometer;

    tilt signal generation does not rely on a detector selected from the group consisting of a gyroscope, an acoustic detector, a magnetic detector, and an optical detector to generate a movement signal;

    the accelerometer is most sensitive to tilt when the accelerometer is perpendicular to gravity; and

    the tilt signal comprises a pitch signal and a roll signal where pitch and roll are rotations about two perpendicular axes orthogonal to the gravitational vector;

    a linear input element that generates an electrical signal responsive to user input;

    the linear input element does not use a detector selected from the group of an acoustic detector, a magnetic detector, and an optical detector to generate the electrical signal andthe linear input element generates the electrical signal of a magnitude controlled by the user;

    an electronic circuit connected to the accelerometer and connected to the linear input element wherein the circuit;

    comprises a control unit, a memory unit, a communications unit; and

    a battery;

    wherein the control unit further comprises a micro-controller, a digital signal processor, and a machine readable storage device;

    calculates the pitch and the roll from the tilt signal without using input from a device selected from the group consisting of a gyroscope, an acoustic detector, a magnetic detector, and an optical detector;

    calculates pitch and roll according to the following equations;

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