Patent ID: 8195423
Filing Date: 2012-06-05
Classification: B82Y,G01D,G01R,G05G,G06F

Abstract:
1. A system comprising: a signal processing sub-system having a physical object and a sensor for generating a signal in response to sensing a magnetic field component in a reference plane, the magnetic field component being representative of at least one of a position and an orientation of the physical object relative to the reference plane, wherein: the sub-system is configured for constraining movement of the object to being tilted with respect to a reference axis, substantially perpendicular to the reference plane, and to being moved along the reference axis; the sensor is operative to generate a distance signal representative of a distance over which the object has moved along the reference axis with respect to a rest position; the sensor is operative to generate a tilt signal representative of a tilt angle of the object with respect to the reference axis; the sub-system has a calibrating device that calibrates the tilt signal; the calibration device is operative to generate a corrected value of the tilt signal by of subtracting a first quantity and a second quantity from a current value of the tilt signal, wherein: the first quantity is representative of a value of the tilt signal when the object is in the rest position and the tilt angle is zero; the second quantity is a product of a first factor and a second factor; the first factor is representative of a value of the tilt signal when the tilt angle is zero and the distance has a predetermined length; the second factor is representative of a ratio of a first term and a second term; the first term is a difference between a value of the distance signal when the object is in the rest position, and a current value of the distance signal; and the second term is a difference between the value of the distance signal when the object is in the rest position and a value of the distance signal when the distance has the predetermined length.