ECG auto-gain control
First Claim
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1. A method for automatic adjustment of gain, comprising:
- receiving data representative of at least one vector from an electrocardiogram device;
determining an amplitude of the vector;
comparing the amplitude with a plurality of thresholds to establish a gain value for the vector; and
adjusting a gain setting based on the gain value.
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Abstract
A method and apparatus for automatic gain control (AGC) method are provided to control the output from a medical device monitoring electrical potentials. The AGC method and apparatus accumulate data indicative of at least one vector in a cycle buffer, calculate an amplitude representative of the signal, compare the calculated value with a set of thresholds, and calculate an adjustment to the gain setting based on the amplitudes relationship to the thresholds.
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Citations
8 Claims
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1. A method for automatic adjustment of gain, comprising:
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receiving data representative of at least one vector from an electrocardiogram device;
determining an amplitude of the vector;
comparing the amplitude with a plurality of thresholds to establish a gain value for the vector; and
adjusting a gain setting based on the gain value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
establishing a baseline value for the vector, wherein the amplitude is determined relative to the baseline value.
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3. A method, as in claim 2, wherein data above an exclusion threshold is excluded from the establishing the baseline value.
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4. A method, as in claim 1, further wherein the relationship of the gain value is input into an algorithm to determine the gain setting.
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5. A method, as in claim 1, wherein determining the amplitude of the vector occurs during a measurement window.
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6. A method, as in claim 1, wherein the measurement window is initiated upon the amplitude of the vector crossing an initiation threshold.
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7. A method, as in claim 1, wherein data indicative of the vector from the electrocardiogram device is decimated.
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8. An device for auto-gain control, comprising:
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at least one circle buffer for receiving data indicative of output of an electrocardiograph device;
a baseline detection circuit for establishing a baseline from the data;
a maximum amplitude detection circuit for establishing the maximum amplitude of the data relative to the baseline;
a comparator circuit for comparing a plurality of amplitudes from the maximum amplitude detection circuit with a plurality of thresholds; and
a decision circuit for determining a gain setting from a relationship between the plurality of amplitudes with the plurality of thresholds.
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Specification