Patent ID: 7962308
Filing Date: 2011-06-14
Classification: A61B,G01C,G01P,G06F

Abstract:
1. A body motion detecting device comprising: a multi-axial acceleration sensor; acceleration-of-gravity calculating means for calculating an acceleration-of-gravity vector from acceleration vectors, which are detection outputs of said multi-axial acceleration sensor; vertical component extracting means for extracting a vertical component of acceleration, using said acceleration vectors from said acceleration sensor and said acceleration-of-gravity vector calculated by said acceleration-of-gravity calculating means; peak detection means for detecting peaks in said vertical component of acceleration extracted by said vertical component extracting means; and vertical body motion detecting means for detecting body motion in the vertical direction by analyzing said peaks detected by said peak detection means, wherein the acceleration-of-gravity calculating means recalculates the acceleration-of-gravity vector after the vertical component of acceleration is extracted, by the vertical component extracting means, from the acceleration-of-gravity vector a predetermined number of times.