Patent ID: 7194816
Filing Date: 2007-03-27
Classification: G01C,G01W,G03B

Abstract:
1. A mobile terminal apparatus, comprising: a magnetic sensor which detects three-axis components of a terrestrial magnetism vector; a tilt angle sensor which detects acceleration components in three-axis directions; a processing unit which is connected to the magnetic sensor and the tilt angle sensor, and which determines azimuth by performing coordinate transformation on the terrestrial magnetism components detected by said magnetic sensor, based on a detection result of said tilt angle sensor, wherein said processing unit detects acceleration components of a frequency in a predetermined range, based on a detection result along an axis among the axes of said tilt angle sensor which most approximates a gravity axis, said processing unit further determines detected acceleration components that do not converge within a predetermined period of time as vibrations due to walking motion and counts a number of user's steps based on said determining.