PROBLEM TO BE SOLVED: To provide a step computing device capable of suppressing setting of an inappropriate dead zone period and an active mass meter including the same.SOLUTION: The active mass meter calculates a dead zone period S by multiplying a walking interval T of this time by a dead zone coefficient when a change period D is within a prescribed range DX, calculates the dead zone period S by multiplying a value for which the walking interval T of the previous time is reduced and corrected by the dead zone coefficient when the change period D is off the prescribed range DX and when the walking interval T of this time is shorter than the walking interval T of the previous time, and calculates the dead zone period S by multiplying a value for which the walking interval T of the previous time is increased and corrected by the dead zone coefficient when the change period D is off the prescribed range DX and the walking interval T of this time is longer than the walking interval T of the previous time.COPYRIGHT: (C)2013,JPO&INPIT【課題】不適切な不感帯期間が設定されることを抑制することのできる歩数演算装置およびこれを備える活動量計を提供する。【解決手段】活動量計は、変化期間Dが所定範囲DX内のとき、今回の歩行間隔Tに不感帯係数を乗じることにより不感帯期間Sを算出する。また、変化期間Dが所定範囲DX外のとき、かつ今回の歩行間隔Tが前回の歩行間隔Tよりも短いとき、前回の歩行間隔Tを減少補正した値に不感帯係数を乗じることにより不感帯期間Sを算出する。また、変化期間Dが所定範囲DX外のとき、かつ今回の歩行間隔Tが前回の歩行間隔Tよりも長いとき、前回の歩行間隔Tを増大補正した値に不感帯係数を乗じることにより不感帯期間Sを算出する。【選択図】図4
