Recognition of a useful signal in a measurement signal
First Claim
1. A method of recognizing a useful signal in a physical measurement signal, the method comprising the steps of(a) transforming the measurement signal for a given time slot into the frequency range, by means of a Fourier transform, (b) identifying frequency peaks in the transformed measurement signal, (c) assigning identified frequency peaks to temporal progressions of identified frequency peaks of one or more preceding time slots to when identified frequency peaks are already present, (d) assigning the temporal progressions to one or more families which are comprised of a fundamental wave and/or of one or more attendant harmonic waves, (e) selecting a family as that which should represent the useful signal, and (f) selecting a frequency peak of the given time slot from the selected family as that which should represent the measured value of the useful signal in this time slot.
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Abstract
Recognition of a useful signal in a measurement signal by: transforming the measurement signal for a given time slot into the frequency range; identifying frequency peaks in the transformed measurement signal; assigning identified frequency peaks to temporal progressions of identified frequency peaks of one or more preceding time slots to the extent the identified frequency peaks are already present; assigning the temporal progressions to one or more families which are comprised of a fundamental wave and/or of one or more harmonic waves; selecting a family as that which should represent the useful signal, and; selecting a frequency peak of the current time slot from the selected family as that which should represent the measured value of the useful signal in this time slot. The signal filtering is preferably used for medical measurement signals, preferably in the area of pulsoximetry and for measuring blood pressure or determining the heart rate.
305 Citations
13 Claims
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1. A method of recognizing a useful signal in a physical measurement signal, the method comprising the steps of
(a) transforming the measurement signal for a given time slot into the frequency range, by means of a Fourier transform, (b) identifying frequency peaks in the transformed measurement signal, (c) assigning identified frequency peaks to temporal progressions of identified frequency peaks of one or more preceding time slots to when identified frequency peaks are already present, (d) assigning the temporal progressions to one or more families which are comprised of a fundamental wave and/or of one or more attendant harmonic waves, (e) selecting a family as that which should represent the useful signal, and (f) selecting a frequency peak of the given time slot from the selected family as that which should represent the measured value of the useful signal in this time slot.
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12. A device for recognizing a useful signal in a physical measurement signal, the device comprising:
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means for transforming the measurement signal for a current time slot into the frequency range by a Fourier transform, means for identifying frequency peaks in the transformed measurement signal, means for assigning identified frequency peaks to temporal progressions of identified frequency peaks of one or more preceding time slots when identified frequency peaks are already present, means for assigning the temporal progressions to one or more families which are comprised of a fundamental wave and/or of one or more attendant harmonic waves, means for selecting a family as that which should represent the useful signal, and means for selecting a frequency peak of the current time slot from the selected family as that which should represent the measured value of the useful signal in this time slot. - View Dependent Claims (13)
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Specification