Adaptive selection of digital ECG filter
First Claim
1. A method for filtering a detected ECG signal using a plurality of digital filters, the method comprising:
- calculating a kurtosis of a detected ECG signal as a statistical quality indicator;
calculating a mid-beat signal-to-noise ratio (SNR) by analyzing successive QRS peaks of the detected ECG signal;
calculating a quality metric for a plurality of digital filters by combining the statistical quality indicator and the mid-beat signal-to-noise ratio (SNR),wherein the statistical quality indicator and the mid-beat SNR quality indicator are combined via a weighted linear combination; and
adaptively selecting one of the plurality of digital filters by comparing the calculated quality metric to a minimum quality metric threshold and by determining a cutoff frequency setting of the one of the plurality of digital filters to prevent erratic switching between the plurality of digital filters.
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Abstract
A method and system for filtering a detected ECG signal are disclosed. In a first aspect, the method comprises filtering the detected ECG signal using a plurality of digital filters. The method includes adaptively selecting one of the plurality of digital filters to maintain a minimum signal-to-noise ratio (SNR). In a second aspect, the system comprises a wireless sensor device coupled to a user via at least one electrode, wherein the wireless sensor device includes a processor and a memory device coupled to the processor, wherein the memory device stores an application which, when executed by the processor, causes the processor to carry out the steps of the method.
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Citations
11 Claims
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1. A method for filtering a detected ECG signal using a plurality of digital filters, the method comprising:
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calculating a kurtosis of a detected ECG signal as a statistical quality indicator; calculating a mid-beat signal-to-noise ratio (SNR) by analyzing successive QRS peaks of the detected ECG signal; calculating a quality metric for a plurality of digital filters by combining the statistical quality indicator and the mid-beat signal-to-noise ratio (SNR), wherein the statistical quality indicator and the mid-beat SNR quality indicator are combined via a weighted linear combination; and adaptively selecting one of the plurality of digital filters by comparing the calculated quality metric to a minimum quality metric threshold and by determining a cutoff frequency setting of the one of the plurality of digital filters to prevent erratic switching between the plurality of digital filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification