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 walking state of the patient from a non-walking activity state of the patient; and
a posture calibration circuit configured to use an orientation of the accelerometer in the walking 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 walking state of the patient from a non-walking activity state of the patient; and a posture calibration circuit configured to use an orientation of the accelerometer in the walking state to perform a posture calibration of the acceleration signal of the accelerometer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13)
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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 walking state of the patient from a non-walking activity 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 walking state from the non-walking activity 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 walking state to perform a posture calibration of the acceleration signal of the accelerometer. - View Dependent Claims (10, 11, 12)
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14. A system comprising:
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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 walking state of the patient from a non-walking activity state of the patient; a posture calibration circuit configured to use an orientation of the accelerometer in the walking state to perform a posture calibration of the acceleration signal of the accelerometer; and a communication circuit configured to receive posture calibration information from the posture calibration circuit; and an external local interface configured to receive the posture calibration information from the communication circuit. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification