Recognition of a useful signal in a measurement signal
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United States of America Patent
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Oct 7, 2003
Grant Date -
N/A
app pub date -
May 14, 2002
filing date -
Jun 10, 1999
priority date (Note) -
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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.
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