Information processing device, measurement device, information processing method, and storage medium

An information processing method comprising:

• deriving frequency characteristics of time-series data of a measurement result by an acceleration sensor;
• and
• determining whether or not the time-series data indicates a running/walking state in accordance with whether or not all determination conditions including at least a first condition, a second condition, and a third condition are satisfied,
• the first condition being a condition indicating that a frequency having a maximum intensity in the derived frequency characteristics is equal to or higher than a lower limit frequency set in advance related to the running/walking state that is a state of walking or running by biped locomotion,
• the second condition being a condition indicating that at least one of the frequency having the maximum intensity or a frequency having second largest intensity in the frequency characteristics falls within a range equal to or higher than the lower limit frequency and equal to or lower than an upper limit frequency set in advance related to the running/walking state, and
• the third condition being a condition based on a magnitude relationship between an interval maximum intensity in a range equal to or higher than the lower limit frequency and equal to or lower than the upper limit frequency in the frequency characteristics and an average intensity of the derived frequency characteristics, the interval maximum intensity in the frequency characteristics being larger than the average intensity of the frequency characteristics by equal to or greater than a reference width related to the running/walking state.

A non-transitory computer-readable storage medium having a program stored thereon for causing a computer to at least:

• derive frequency characteristics of time-series data of a measurement result by an acceleration sensor;
• and
• determine whether or not the time-series data indicates a running/walking state in accordance with whether or not all determination conditions including at least a first condition, a second condition, and a third condition are satisfied,
• the first condition being a condition indicating that a frequency having a maximum intensity in the derived frequency characteristics is equal to or higher than a lower limit frequency set in advance related to the running/walking state that is a state of walking or running by biped locomotion,
• the second condition being a condition indicating that at least one of the frequency having the maximum intensity or a frequency having second largest intensity in the frequency characteristics falls within a range equal to or higher than the lower limit frequency and equal to or lower than an upper limit frequency set in advance related to the running/walking state, and
• the third condition being a condition based on a magnitude relationship between an interval maximum intensity in a range equal to or higher than the lower limit frequency and equal to or lower than the upper limit frequency in the frequency characteristics and an average intensity of the derived frequency characteristics, the interval maximum intensity in the frequency characteristics being larger than the average intensity of the frequency characteristics by equal to or greater than a reference width related to the running/walking state.