Method for measuring movements of a person wearing a portable detector
First Claim
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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Abstract
A process for detecting activity of a person, in which movements of the person are measured by at least one sensor attached to the person, and respective components of the movements due to external activity and due to physiological activity are separated. The process obtains a signal of the sensor, filters the signal to derive a filtered signal, the filtering including partitioning the signal of the center into a low frequency component and high frequency component, and subtracts the filtered signal from the signal of the sensor. The filtering further variably extracts portions of the high frequency component according to a criterion of either a minimal level or a minimal instability of the signal of the sensor, and the filtered signal includes the low frequency component and the extracted portions of the high frequency components.
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Citations
16 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for detecting an external activity signal and a separated physiological activity signal of a person, the process comprising:
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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 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 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification