Method and apparatus for indicating repetition intervals of a specified component of a composite electrical signal, particularly useful for displaying fetal r-waves
First Claim
1. A method of indicating the repetition intervals of a specified component of a composite cyclically-repeating electrical signal, comprising the steps:
- generating a first electrical signal corresponding to the second derivative of said composite signal;
generating a second electrical signal corresponding to the second derivative of said composite signal after said specified component has been removed;
subtracting said second electrical signal from said first electrical signal to produce a third electrical signal;
and utilizing said third electrical signal for indicating the repetition intervals of said specified component.
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Accused Products
Abstract
The method and apparatus particularly are applicable for displaying the fetal R-wave with respect to the maternal R-wave, and comprise the steps of generating a first electrical signal corresponding to the second derivative of the composite signal (maternal R-wave); generating a second electrical signal corresponding to the second derivative of the composite signal after the specified component has been removed; subtracting the second electrical signal from the first electrical signal to produce a third electrical signal; and utilizing the third electrical signal for indicating the repetition intervals (fetal R-waves) of the specified component.
59 Citations
20 Claims
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1. A method of indicating the repetition intervals of a specified component of a composite cyclically-repeating electrical signal, comprising the steps:
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generating a first electrical signal corresponding to the second derivative of said composite signal; generating a second electrical signal corresponding to the second derivative of said composite signal after said specified component has been removed; subtracting said second electrical signal from said first electrical signal to produce a third electrical signal; and utilizing said third electrical signal for indicating the repetition intervals of said specified component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for indicating the repetition intervals of a specified component of a composite cyclically-repeating electrical signal, comprising:
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means for generating a first electrical signal corresponding to the second derivative of said composite signal; means for generating a second electrical signal corresponding to the second derivative of said composite signal after said specified component has been removed; means for subtracting said second electrical signal from said first electrical signal to produce a third electrical signal; and means for utilizing said third electrical signal for indicating the repetition intervals of said specified component. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification