Method for determining an instant velocity of a user and for improving estimation of heart rate
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United States of America Patent
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Mar 14, 2017
Grant Date -
Aug 27, 2015
app pub date -
Feb 20, 2015
filing date -
Feb 21, 2014
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Abstract
The present disclosure concerns a method for determining an instant velocity of a user using a sensing device destined to be worn on an arm of the user and comprising a motion sensor for measuring a motion signal; the method comprising: measuring the motion signal and identifying when the user is performing a rhythmical activity; identifying when the user is walking or running; providing a relationship between the measured motion signal and corresponding motion features relating to a propulsive impulsion of a user's step; estimating a frequency of the user's step and a user-relative step length of the user using the motion features; and determining a user-relative instants velocity by combining the estimated step frequency and the estimated step length; the instant velocity being determined from the user-relative instant velocity using a calibration factor from the user-relative instant velocity using a calibration factor.
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