Method and apparatus for comparing waveform shapes of time-varying signals
First Claim
1. A method for comparing sequential waveshape portions of at least one time-varying signal, comprising:
- forming sequential initial templates, each initial template consisting of a plurality of digital signal sample values representative of the amplitude of successive time-spaced samples of a respective portion of said time-varying signal;
forming from each of said initial templates a corresponding reduced template having a plurality of digital signal elements which is less in number than the plurality of sample values in its corresponding initial template, each element of said reduced template comprising a combination of at least two sample values from its corresponding initial template; and
processing correspondingly positioned elements of at least two of said reduced templates for deriving a comparison signal representative of the degree of similarity of the respective portions of said time-varying signal represented by said at least two reduced templates.
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Abstract
A method and apparatus for comparing waveshape portions of at least one time-varying signal by first forming initial templates of digital signal samples representative of the amplitude of successive time-spaced samples of portions of the time-varying signal. Next, forming reduced templates having a number of digital signal elements which is less than the number of samples in corresponding ones of the initial templates, each element of the reduced template comprising a combination of at least two samples from its corresponding initial template. And then processing corresponding elements of at least two of the reduced templates for deriving a signal representative of the degree of similarity of the respective portions of the time-varying signal represented by at least two reduced templates.
35 Citations
15 Claims
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1. A method for comparing sequential waveshape portions of at least one time-varying signal, comprising:
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forming sequential initial templates, each initial template consisting of a plurality of digital signal sample values representative of the amplitude of successive time-spaced samples of a respective portion of said time-varying signal; forming from each of said initial templates a corresponding reduced template having a plurality of digital signal elements which is less in number than the plurality of sample values in its corresponding initial template, each element of said reduced template comprising a combination of at least two sample values from its corresponding initial template; and processing correspondingly positioned elements of at least two of said reduced templates for deriving a comparison signal representative of the degree of similarity of the respective portions of said time-varying signal represented by said at least two reduced templates. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for comparing waveshape portions of at least one time-varying signal, comprising:
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means for forming sequential initial templates, each initial template consisting of a plurality of digital signal sample values representative of the amplitude of successive time-spaced samples of a respective portion of said time-varying signal; means for forming from each of said initial templates a corresponding reduced template having a plurality of digital signal elements which is less in number than the plurality of sample values in its corresponding initial template, each element of said reduced template comprising a combination of at least two sample values from its corresponding initial template; and means for processing correspondingly positioned elements of at least two of said reduced templates for deriving a comparison signal representative of the degree of similarity of respective portions of said time-varying signal represented by said at least two reduced templates. - View Dependent Claims (7, 8, 9, 10)
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11. Apparatus for monitoring electrocardiograph (ECG) signals, comprising:
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electrodes for developing an analog ECG signal; A/D conversion means for developing digital ECG signal sample values representative of the amplitude at sequential time-spaced intervals of said analog ECG signals; means for forming successive initial templates consisting of said digital signal sample values for successive portions of said ECG signal; means for combining at least two digital signal sample values of each initial template for forming each element of a corresponding reduced template; means for processing corresponding positioned elements of at least two of said reduced templates for deriving a comparison signal representative of the degree of similarity of successive time-spaced intervals of said ECG signal represented by said at least two reduced templates. - View Dependent Claims (12, 13, 14, 15)
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Specification