US 11,982,542 B2
Number of steps measuring device, method, and program
Yuki Hashimoto, Tokyo (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 17/293,756
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Jan. 7, 2020, PCT No. PCT/JP2020/000148
§ 371(c)(1), (2) Date May 13, 2021,
PCT Pub. No. WO2020/149171, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 2019-004157 (JP), filed on Jan. 15, 2019.
Prior Publication US 2021/0404842 A1, Dec. 30, 2021
Int. Cl. G01C 22/00 (2006.01); A63B 24/00 (2006.01); G01P 15/18 (2013.01)
CPC G01C 22/006 (2013.01) [A63B 24/0062 (2013.01); G01P 15/18 (2013.01); A63B 2220/17 (2013.01); A63B 2220/40 (2013.01); A63B 2220/803 (2013.01); A63B 2220/836 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A step-counting device comprising:
a first calculator configured to synthesize respective measured values of acceleration of a plurality of measuring axes measured by a measurement device, the measurement device being configured to measure acceleration of the plurality of measuring axes and calculate synthesized acceleration;
a second calculator configured to:
calculate a deviation between a body axis direction of a wearer and a coordinate axis of the measurement device; and
calculate acceleration in the body axis direction of the wearer wearing the measurement device according to the respective measured values of acceleration of the plurality of measuring axes and the deviation between the body axis direction of the wearer and the coordinate axis of the measurement device;
a third calculator configured to calculate amplitude of a time variation of the acceleration calculated by the second calculator;
a reference setting unit configured to set a reference time for determining one step based on the amplitude;
a walking detector configured to detect walking motion by the wearer based on the synthesized acceleration, a one-step time of the wearer falling within a range of the reference time in the walking motion; and
a fourth calculator configured to calculate a number of steps of the walking motion detected by the walking detector.