Posture sensor automatic calibration
First Claim
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1. A device comprising:
- an accelerometer configured to sense an acceleration signal from a patient;
a filter circuit configured to extract a characteristic of the acceleration signal;
a comparison circuit configured to perform a comparison between the characteristic of the acceleration signal and a stored template to distinguish a first state of the patient from a second state of the patient; and
a posture calibration circuit configured to use an orientation of the accelerometer in the first state to perform a posture calibration of the acceleration signal of the accelerometer.
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Abstract
A system and method automatically calibrate a posture sensor, such as by detecting a walking state or a posture change. For example, a three-axis accelerometer can be used to detect a patient'"'"'s activity or posture. This information can be used to automatically calibrate subsequent posture or acceleration data.
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Citations
20 Claims
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1. A device comprising:
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an accelerometer configured to sense an acceleration signal from a patient; a filter circuit configured to extract a characteristic of the acceleration signal; a comparison circuit configured to perform a comparison between the characteristic of the acceleration signal and a stored template to distinguish a first state of the patient from a second state of the patient; and a posture calibration circuit configured to use an orientation of the accelerometer in the first state to perform a posture calibration of the acceleration signal of the accelerometer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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an accelerometer configured to sense an acceleration signal from a patient; a first filter circuit configured to extract a first component of the acceleration signal; a comparison circuit configured to perform a comparison between a characteristic of the first component of the acceleration signal and a stored template to distinguish a first state of the patient from a second state of the patient; a second filter circuit configured to extract a second component of the acceleration signal; a signal processor circuit configured to; determine a gravity vector using the second component of the acceleration signal; compute a parallel component of the acceleration signal, the parallel component being in the direction of the gravity vector; compute an orthogonal component of the acceleration signal, the orthogonal component being in a direction orthogonal to the gravity vector; compare the parallel component to a parallel template and compare the orthogonal component to an orthogonal template; and distinguish the first state from the second state using the computed parallel component of the acceleration signal and using the computed orthogonal component of the acceleration signal; and a posture calibration circuit configured to use an orientation of the accelerometer in the first state to perform a posture calibration of the acceleration signal of the accelerometer. - View Dependent Claims (10, 11, 12, 13)
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14. A method comprising:
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sensing an acceleration signal from a patient using an accelerometer; detecting a first state using the acceleration signal, the detecting the first state including; extracting a characteristic of an AC component of the acceleration signal; performing a comparison between the characteristic and a template; and using the comparison to distinguish the first state from a second state; and using an orientation of the accelerometer in the first state to perform a posture calibration of the acceleration signal of the accelerometer. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification