Patent ID: 9250300
Filing Date: 2016-02-02
CPC Classification: A63F,G01C,G01R

Claim Text:
1. A method of calibrating a mobile device including a magnetometer during application usage, comprising: measuring an ambient magnetic field with the magnetometer; sampling magnetic information received from the magnetometer, each sample of the magnetic information including a vector component of the ambient magnetic field along each of a first axis, a second axis, and a third axis, the first axis, the second axis, and the third axis being orthogonal to each other; recognizing an initial controller orientation signal derived from a first sample of a plurality of samples of the magnetic information and from directional offset data including a first directional offset along the first axis, a second directional offset along the second axis, and a third directional offset along the third axis; calculating updated directional offset data by filtering unfiltered directional offset data with the directional offset data; and deriving a calibrated controller orientation signal from a second sample of the plurality of samples of the magnetic information and the updated directional offset data; and controlling operation of the mobile device with the calibrated controller orientation signal.