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Method for measuring movements of a person wearing a portable detector

  • US 10,231,628 B2
  • Filed: 12/21/2007
  • Issued: 03/19/2019
  • Est. Priority Date: 07/02/2003
  • Status: Active Grant
First Claim
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1. A process for detecting an external activity signal and a separated physiological activity signal of a person, the process comprising:

  • obtaining a signal from a sensor measuring movements of a person to which the sensor is attached, the signal composed of a first component due to physiological activity of the person and a second component due to external activity of the person;

    repeatedly computing a value of a criterion of either a minimal level or a minimal instability of the signal obtained from the sensor; and

    filtering, in a filter, the signal from the sensor to derive a filtered signal representative of the person'"'"'s external activity, the filtering comprising a partition of the signal from the sensor into a low frequency component and a high frequency component, the filtered signal comprising the low frequency component of the signal of the sensor and a portion of the high frequency component, the portion being variable in the signal obtained from the sensor and depending, in each time portion of the filtered signal, on the value of the criterion, the portion of the high frequency component being greater when either the minimal level or the minimal instability of the signal of the sensor is reached; and

    subtracting the filtered signal from the signal obtained from the sensor, to obtain the first component of the signal due to physiological activity separated from the external activity signal.

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