Adaptive line noise canceler and detector for ECG signals
First Claim
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1. A device for detecting and removing noise from an ECG signal comprising:
- an ECG signal input for receiving an ECG signal from a patient;
an ECG gate signal which has a portion of said ECG signal blanked from a point in time just prior to the onset of the QRS portion of said ECG signal and ending at a point in time just after the end of the QRS portion; and
an adaptive line noise canceler for removing line noise from said ECG signal wherein said adaptive line noise canceler receives said ECG signal and said ECG gate signal adjusts to changes in said ECG signal from said ECG input to remove varying amounts of said line noise from said ECG signal.
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Abstract
An adaptive line noise detection and cancellation system having a baseline wander filter, high and low pass filters, an adaptive line noise canceler and various noise detectors is provided to identify, signal and remove contamination from an ECG signal wherein the ECG signal is conditioned to remove various portions of the ECG signal prior to processing in various noise detectors while minimizing the signal conditioning effect of the filters on the ECG signal and while further providing the operator with the ability to manually or automatically activate the filters and to indicate the status of the filters on a printout or display.
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Citations
30 Claims
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1. A device for detecting and removing noise from an ECG signal comprising:
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an ECG signal input for receiving an ECG signal from a patient; an ECG gate signal which has a portion of said ECG signal blanked from a point in time just prior to the onset of the QRS portion of said ECG signal and ending at a point in time just after the end of the QRS portion; and an adaptive line noise canceler for removing line noise from said ECG signal wherein said adaptive line noise canceler receives said ECG signal and said ECG gate signal adjusts to changes in said ECG signal from said ECG input to remove varying amounts of said line noise from said ECG signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for detecting and removing noise from an ECG signal comprising:
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an ECG signal input for receiving an ECG signal from a patient; an ECG gate signal which has a portion of said ECG signal blanked from a point in time just prior to the onset of the QRS portion of said ECG signal and ending at a point in time just after the end of the QRS portion; means, connected to said input for attenuating and delaying the frequency components of said ECG signal to filter said ECG signal; means, connected to said means for filtering for removing line noise from said ECG signal wherein said means receives said ECG signal and said ECG gate signal and adjusts to said ECG signal from said ECG input to remove varying amounts of said line noise from said ECG signal in response to changes in said ECG signal. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A device for detecting and removing noise from an ECG signal comprising:
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an ECG signal input for receiving an ECG signal from a patient; an ECG gate signal which has a portion of said ECG signal blanked from a point in time just prior to the onset of the QRS portion of said ECG signal and ending at a point in time just after the end of the QRS portion; a filter connected to said ECG input for removing contamination from said ECG signal; and an adaptive line noise canceler for removing line noise from said ECG signal wherein said adaptive line noise canceler receives said ECG signal and said ECG gate signal and adjusts to said ECG signal from said ECG input to remove varying amounts of said line noise from said ECG signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for detecting and removing noise from an ECG signal comprising:
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providing an ECG signal input for receiving an ECG signal from a patient; providing an ECG gate signal which has a portion of said ECG signal blanked from a point in time just prior to the onset of the QRS portion of said ECG signal and ending at a point in time just after the end of the QRS portion; providing the ECG signal and ECG gate signal to an adaptive line noise canceler for removing line noise from the ECG signal and adjusting the adaptive line noise canceler to changes in the ECG signal to remove varying amounts of line noise from the processed ECG signal. - View Dependent Claims (26, 27)
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28. A method for detecting and removing noise from an ECG signal comprising:
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providing an ECG signal input for receiving an ECG signal from a patient; providing the ECG signal to a filter having an ECG input thereon and processing the ECG signal to remove contamination from the ECG signal; providing the processed ECG signal to an adaptive line noise canceler for removing line noise from the processed ECG signal and adjusting the adaptive line noise canceler to the processed ECG signal to remove varying amounts of line noise from the processed ECG signal; and providing at least one noise detector to signal to an operator of the device that noise exists in the ECG signal. - View Dependent Claims (29, 30)
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Specification