Method and apparatus for signal averaging and analyzing high resolution P wave signals from an electrocardiogram
First Claim
1. A method of averaging the P wave portion of ECG signals comprising the steps of,sensing human ECG signals having at least a QRS portion and a P wave portion,detecting the QRS portion of the ECG signals,suppressing the QRS portion of the ECG signals,generating a P wave detection function from the P wave portion of the ECG signals,cross correlating the detection functions of the P wave portions of the ECG signals, andaveraging the cross correlated P wave detection function signals.
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Abstract
A method and apparatus for signal averaging and analyzing high resolution P wave signals from an electrocardiogram. The method and apparatus for averaging the P wave portion of ECG signals includes sensing human ECG signals having at least a QRS portion and a P wave portion, detecting the QRS portion of the ECG signals, suppressing the QRS portion of the ECG signals, generating a P wave detection function from the wave portion of the ECG signals, cross correlating the P wave portions of the ECG signals and averaging the cross correlated P wave signals. The method and apparatus for analyzing high resolution P wave signals includes averaging at least a portion of the ECG signals, filtering the averaged signals, deriving the vector magnitude (VM) of the filtered averaged signals, determining the base noise level, and setting the P onset and P offset of the VM signals above the noise level.
38 Citations
29 Claims
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1. A method of averaging the P wave portion of ECG signals comprising the steps of,
sensing human ECG signals having at least a QRS portion and a P wave portion, detecting the QRS portion of the ECG signals, suppressing the QRS portion of the ECG signals, generating a P wave detection function from the P wave portion of the ECG signals, cross correlating the detection functions of the P wave portions of the ECG signals, and averaging the cross correlated P wave detection function signals.
- 14. An apparatus for averaging the P wave portions of ECG signals and including, acquisition means for acquiring human ECG signals taken along the X, Y and Z axes and having at least a QRS portion and a P wave portion, means for detecting the QRS portions of the ECG signals, means for suppressing the QRS portion of the ECG signals, means for generating a P detection function of the ECG signals after suppression of the QRS portion, means for cross correlating the detection functions of the P wave portion of the ECG signals with a template and means for averaging the cross correlated detection functions of the P wave portions.
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16. An apparatus for averaging the P wave portions of ECG signals and including,
acquisition means for acquiring human ECG signals taken along the X, Y and Z axes and having at least a QRS portion and a P wave portion, processor means programmed for detecting the QRS portions of the ECG signals, for suppressing the QRS portions of the ECG signals, for generating a P detection function, for cross correlating the detection functions of the P waves with a template, and for averaging the cross correlated detection functions of the P waves.
- 17. A method of determining the filtered onset and offset of the P wave portion of ECG signals, comprising the steps of averaging at least a portion of the ECG signals, filtering the averaged signals, deriving the vector magnitude (VM) of the filtered averaged signals, determining the base noise level, and setting the P onset and P offset of the VM signals above the noise level.
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23. An apparatus for determining the onset and offset of the P wave portion of ECG signals, including means for averaging at least a portion of the ECG signals, means for filtering the average signals, means for deriving the vector magnitude of the filter average signals, means for determining the base noise level, and means for setting the P onset and P offset of the vector magnitude signals above the noise level.
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24. An apparatus for averaging the P wave portions of ECG signals and including,
acquisition means for acquiring human ECG signals, processor means programmed to detect the QRS portions of the ECG signals, to suppress the QRS portions of the ECG signals, to generate a P detection function, to derive a template of the P wave detection functions, to cross correlate the P wave with the template, and to average the cross correlated P waves.
Specification