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Calibration factors for step frequency bands

  • US 10,352,724 B1
  • Filed: 05/03/2013
  • Issued: 07/16/2019
  • Est. Priority Date: 05/03/2013
  • Status: Active Grant
First Claim
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1. A method comprising:

  • obtaining, from a motion sensor of a mobile device, motion data;

    determining, from a digital pedometer of the mobile device, a step frequency of a user carrying the mobile device, the step frequency determined from the motion data;

    obtaining, by the digital pedometer of the mobile device, a calibration factor;

    determining, by the digital pedometer, a first step frequency band for the calibration factor based on the step frequency;

    determining, by the digital pedometer, a first average calibration factor for the first step frequency band using the calibration factor;

    determining, by the digital pedometer, that the first average calibration factor is higher than a second average calibration factor for a second step frequency band, where the second step frequency band is higher than the first step frequency band;

    updating, by the digital pedometer, the second average calibration factor for the second step frequency band by setting the second average calibration factor equal to the first average calibration factor;

    obtaining, by the digital pedometer, a new step frequency from the digital pedometer;

    determining, by the digital pedometer, that the new step frequency is in the second step frequency band;

    estimating, by the digital pedometer, a new distance traveled by the user of the mobile device, using the new step frequency and the updated second average calibration factor; and

    displaying, on a display device, the new distance traveled by the user carrying the mobile device.

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