TECHNIQUE FOR DETERMINING SIGNAL QUALITY IN A PHYSIOLOGIC SENSING SYSTEM USING HIGH FREQUENCY SAMPLING
First Claim
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1. A heart monitor comprising:
- an electric signal acquisition and processing stage;
two implantable electrodes configured to pick up myocardial electric signals;
said electric signal acquisition and processing stage connected or being connectable to the two implantable electrodes;
said electric signal acquisition and processing stage comprising a first channel and a second channel that are utilized as signal processing channels;
said first channel comprisinga first sampling stage configured to sample picked-up myocardial electric signals at a first sampling rate, said first channel adapted to process the picked-up myocardial electric signals and generate an electrogram signal;
said second channel comprisinga high frequency sampling stage configured to sample at least portions of said picked-up myocardial electric signals at a second sampling rate, wherein said second sampling rate is higher than said first sampling rate;
a differential stage adapted to generate a high frequency sampled output signal that represents a difference between two consecutive high frequency sampled myocardial electric signal values; and
,a comparator that is adapted to compare said high frequency sampled output signal with a threshold and to generate a noise detection indicator whenever said threshold is exceeded.
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Abstract
A medical device for processing physiological signals such as electrocardiograms. The processing includes: sampling a physiologic signal in a first channel with a first sampling rate, simultaneously sampling the physiologic signal in a second channel with a higher sampling rate to thus generate pairs of sampling values, forming the difference between two sampling values of each pair, comparing said difference with a threshold, and generating a noise detection indicator whenever said threshold is exceeded.
45 Citations
10 Claims
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1. A heart monitor comprising:
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an electric signal acquisition and processing stage; two implantable electrodes configured to pick up myocardial electric signals; said electric signal acquisition and processing stage connected or being connectable to the two implantable electrodes; said electric signal acquisition and processing stage comprising a first channel and a second channel that are utilized as signal processing channels; said first channel comprising a first sampling stage configured to sample picked-up myocardial electric signals at a first sampling rate, said first channel adapted to process the picked-up myocardial electric signals and generate an electrogram signal; said second channel comprising a high frequency sampling stage configured to sample at least portions of said picked-up myocardial electric signals at a second sampling rate, wherein said second sampling rate is higher than said first sampling rate; a differential stage adapted to generate a high frequency sampled output signal that represents a difference between two consecutive high frequency sampled myocardial electric signal values; and
,a comparator that is adapted to compare said high frequency sampled output signal with a threshold and to generate a noise detection indicator whenever said threshold is exceeded. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for processing electric signals representing a time course of myocardial potentials comprising:
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sampling a physiologic signal in a first channel with a first sampling rate; simultaneously sampling the physiologic signal in a second channel with a second sampling rate that is higher than said first sampling rate; forming a difference between two sampling values taken from said second channel; comparing said difference with a threshold; and
,generating a noise detection indicator whenever said threshold is exceeded. - View Dependent Claims (9, 10)
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Specification