Patent ID: 8412277
Filing Date: 2013-04-02
Classification: G01V,G06F,H04M

Abstract:
1. A gravity axis determination apparatus for determining and detecting one of three axes constructing a three-dimensional space as a gravity axis, comprising a signal generating part for generating at least two axis acceleration signals each indicating an acceleration in each of directions of at least two axes among said three axes; a fetching part for fetching each of said axis acceleration signals as at least two axis acceleration data trains; and a determining and detecting part for comparing data values of said axis acceleration data trains in a same time zone, determining one of said three axes as said gravity axis, and generating a detection signal indicating said gravity axis, wherein when said determining and detecting part determines a plurality of times with lapse of time that said data value in one of said axis acceleration data trains is larger than said data value of the axis acceleration data train other than said one of said axis acceleration data trains in said same time zone, the axis corresponding to said one of said axis acceleration data trains is determined as said gravity axis.