Patent ID: 8131500

Claim:
A pedometer comprising: a plurality of walking sensors that have respective sensitivity axes which differ from each other and that detect acceleration motion of a user during walking and output acceleration signals indicative of walking; a plurality of walking detecting means responsive to the acceleration signals for outputting walking signals in correspondence with walking detected by the walking sensors; and calculating means for detecting the walking signals from the plurality of walking detecting means and calculating a step number based on the detected walking signals; wherein the calculating means alternately carries out a detecting operation which detects the walking signals and a mask operation which does not detect the walking signals in a predetermined mask time after the detecting operation when the walking signals are detected, wherein the calculating means sets the mask time to a value of a range equal to or larger than a half of a walking signal period of the walking signal in correspondence with a lower limit of the measurable walking pitch and equal to or smaller than the walking signal period of the walking signal in correspondence with an upper limit value of the measurable walking pitch, wherein the calculating means includes converting means for synthesizing the walking signals inputted in parallel from the plurality of walking detecting means to convert them into a synthesized walking signal, wherein when the calculating means detects the synthesized walking signal, a detecting operation of detecting the synthesized walking signal and the mask operation at the mask time after the detecting operation are alternately carried out, and wherein the converting means comprises logical operating means for converting a logical sum of the walking signals inputted in parallel from the plurality of walking detecting means into the synthesized walking signal synthesized by logically operating the walking signals.