MAGNETIC DATA PROCESSING DEVICE, MAGNETIC DATA PROCESSING METHOD, AND MAGNETIC DATA PROCESSING PROGRAM
First Claim
1. A magnetic data processing device comprising:
- an accumulating part that repeatedly accumulates a predetermined number of magnetic data to provide a recent statistical population, the predetermined number being four or greater, while sequentially acquiring magnetic data output from a three-dimensional (3D) magnetic sensor;
a past statistical population storage part that stores, as a past statistical population, magnetic data output from the 3D magnetic sensor prior to the magnetic data accumulated as the recent statistical population;
a determination part that determines, using a threshold, whether or not a distribution of the recent statistical population satisfies a certain condition each time the recent statistical population is provided, and that determines, using another threshold, whether or not a mixed statistical population composed of the past statistical population and the recent statistical population satisfies another condition when the recent statistical population does not satisfy the certain condition; and
an offset derivation part that derives an offset of the magnetic data based on the recent statistical population when the recent statistical population satisfies the certain condition and derives an offset of the magnetic data based on the mixed statistical population when the mixed statistical population satisfies said another condition,wherein the past statistical population storage part updates the past statistical population using at least part of the recent statistical population.
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Accused Products
Abstract
In a magnetic data processing device, an accumulating part sequentially acquires magnetic data output from a 3D magnetic sensor to provide a recent statistical population of the magnetic data. A past statistical population storage part stores, as a past statistical population, magnetic data output from the 3D magnetic sensor prior to the magnetic data accumulated as the recent statistical population. A determination part determines whether a distribution of the recent statistical population satisfies a certain condition, and determines whether a mixed statistical population of the past and recent statistical populations satisfies another condition when the recent statistical population does not satisfy the certain condition. An offset derivation part derives an offset of the magnetic data based on the recent statistical population when it satisfies the certain condition and derives an offset of the magnetic data based on the mixed statistical population when it satisfies said another condition. The past statistical population storage part updates the past statistical population using the recent statistical population.
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Citations
8 Claims
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1. A magnetic data processing device comprising:
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an accumulating part that repeatedly accumulates a predetermined number of magnetic data to provide a recent statistical population, the predetermined number being four or greater, while sequentially acquiring magnetic data output from a three-dimensional (3D) magnetic sensor; a past statistical population storage part that stores, as a past statistical population, magnetic data output from the 3D magnetic sensor prior to the magnetic data accumulated as the recent statistical population; a determination part that determines, using a threshold, whether or not a distribution of the recent statistical population satisfies a certain condition each time the recent statistical population is provided, and that determines, using another threshold, whether or not a mixed statistical population composed of the past statistical population and the recent statistical population satisfies another condition when the recent statistical population does not satisfy the certain condition; and an offset derivation part that derives an offset of the magnetic data based on the recent statistical population when the recent statistical population satisfies the certain condition and derives an offset of the magnetic data based on the mixed statistical population when the mixed statistical population satisfies said another condition, wherein the past statistical population storage part updates the past statistical population using at least part of the recent statistical population. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A magnetic data processing method comprising:
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repeatedly accumulating a predetermined number of magnetic data to provide a recent statistical population, the predetermined number being four or greater, while sequentially acquiring magnetic data output from a three-dimensional (3D) magnetic sensor; storing, as a past statistical population, magnetic data output from the 3D magnetic sensor prior to the magnetic data accumulated as the recent statistical population; determining, using a threshold, whether or not a distribution of the recent statistical population satisfies a certain condition each time the recent statistical population is provided, and determining, using another threshold, whether or not a mixed statistical population composed of the past statistical population and the recent statistical population satisfies another condition when the recent statistical population does not satisfy the certain condition; deriving an offset of the magnetic data based on the recent statistical population when the recent statistical population satisfies the certain condition, and deriving an offset of the magnetic data based on the mixed statistical population when the mixed statistical population satisfies said another condition; and updating the past statistical population using at least part of the recent statistical population.
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8. A machine readable storage medium for use in a computer, the medium containing a magnetic data processing program which is executable by the computer to perform a process of:
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repeatedly accumulating a predetermined number of magnetic data to provide a recent statistical population, the predetermined number being four or greater, while sequentially acquiring magnetic data output from a three-dimensional (3D) magnetic sensor; storing, as a past statistical population, magnetic data output from the 3D magnetic sensor prior to the magnetic data accumulated as the recent statistical population; determining, using a threshold, whether or not a distribution of the recent statistical population satisfies a certain condition each time the recent statistical population is provided, and determining, using another threshold, whether or not a mixed statistical population composed of the past statistical population and the recent statistical population satisfies another condition when the recent statistical population does not satisfy the certain condition; deriving an offset of the magnetic data based on the recent statistical population when the recent statistical population satisfies the certain condition, and deriving an offset of the magnetic data based on the mixed statistical population when the mixed statistical population satisfies said another condition; and updating the past statistical population using at least part of the recent statistical population.
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Specification