Step length estimation method and portable terminal for the same
First Claim
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1. A portable terminal comprising:
- an accelerometer for detecting and outputting an acceleration signal of at least one axis;
a step detection unit for determining an acceleration variance value from the acceleration signal by performing a sliding window summation;
a movement state determination unit for determining, when steps are detected by the step detection unit, whether a movement state of a user comprises a running state or a walking state based on a comparison between the acceleration variance value and a critical value, wherein the movement state determination unit determines that the movement state comprises the running state if the acceleration variance value is larger than the critical value, and determines that the movement state comprises the walking state if the acceleration variance value is smaller than the critical value; and
a step length estimation unit for estimating a step length of the user using a different step length estimation algorithm corresponding to each of the determined running state and walking state.
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Abstract
An apparatus and method for estimating a step length of a user are provided. The apparatus and method use a step length estimation algorithm, e.g. a step length estimation parameter coefficient, according to a movement state of a user, i.e. whether the movement state is a walking state or a running state. The movement state of the user is determined on the basis of an acceleration variance value of an acceleration signal output from an accelerometer. Accordingly, the apparatus and method prevent errors in step length determinations.
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Citations
12 Claims
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1. A portable terminal comprising:
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an accelerometer for detecting and outputting an acceleration signal of at least one axis; a step detection unit for determining an acceleration variance value from the acceleration signal by performing a sliding window summation; a movement state determination unit for determining, when steps are detected by the step detection unit, whether a movement state of a user comprises a running state or a walking state based on a comparison between the acceleration variance value and a critical value, wherein the movement state determination unit determines that the movement state comprises the running state if the acceleration variance value is larger than the critical value, and determines that the movement state comprises the walking state if the acceleration variance value is smaller than the critical value; and a step length estimation unit for estimating a step length of the user using a different step length estimation algorithm corresponding to each of the determined running state and walking state. - View Dependent Claims (2, 3, 4)
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5. A step length estimation method in a portable terminal, the method comprising:
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determining, by a step detection unit, an acceleration variance value from an acceleration signal of at least one axis by performing a sliding window summation; determining, by a movement state determination unit, when steps are detected by the step detection unit, whether a movement state of a user comprises a running state or a walking state based on a comparison between the acceleration variance value and a critical value, wherein the determining of the movement state of the user comprises determining that the movement state comprises the running state if the acceleration variance value is larger than the critical value, and determining that the movement state comprises the walking state if the acceleration variance value is smaller than the critical value; and estimating, by a step length estimation unit, a step length of the user using a different step length estimation algorithm corresponding to each of the determined running state and walking state. - View Dependent Claims (6, 7, 8)
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9. A portable device comprising:
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a step detection unit for determining an acceleration variance value of at least one axis by performing a sliding window summation; a movement state determination unit for determining, when steps are detected by the step detection unit, whether a movement state of a user comprises a running state or a walking state based on a comparison between the acceleration variance value and a critical value, wherein the movement state determination unit determines that the movement state comprises the running state if the acceleration variance value is larger than the critical value, and determines that the movement state comprises the walking state if the acceleration variance value is smaller than the critical value; and a step length estimation unit for estimating a step length of the user using a different step length estimation algorithm corresponding to each of the determined running state and walking state. - View Dependent Claims (10, 11, 12)
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Specification