Apparatus and method for detecting step in a personal navigator
First Claim
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1. A step detecting apparatus in a personal navigator, comprising:
- an accelerometer sensor for outputting acceleration signals with respect to at least two directions; and
a step detector configured to calculate variances of acceleration signals in the at least two directions received from the accelerometer sensor, summing the variances, comparing the variance sum with a threshold, and determining whether a detected step is a mark-time step or a walking step according to the comparison,wherein two of the at least two directions are a forward direction and a downward direction from the pedestrian.
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Abstract
A step detecting apparatus and method in a personal navigator where acceleration signals in at least two directions are acquired from an accelerometer sensor, as a pedestrian moves. Variances of the acceleration signals are calculated and summed. The variance sum is compared with a threshold. If the variance sum is greater than the threshold, it is determined that a detected step is a walking step. If the variance sum is less than the threshold, it is determined that the detected step is a mark-time step.
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Citations
11 Claims
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1. A step detecting apparatus in a personal navigator, comprising:
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an accelerometer sensor for outputting acceleration signals with respect to at least two directions; and a step detector configured to calculate variances of acceleration signals in the at least two directions received from the accelerometer sensor, summing the variances, comparing the variance sum with a threshold, and determining whether a detected step is a mark-time step or a walking step according to the comparison, wherein two of the at least two directions are a forward direction and a downward direction from the pedestrian. - View Dependent Claims (2, 3, 4, 5)
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6. A step detecting method in a personal navigator, comprising the steps of:
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acquiring acceleration signals in at least two directions from an accelerometer sensor; calculating variances of the acceleration signals and summing the variances; comparing the variance sum with a threshold; determining that a detected step is a walking step if the variance sum is greater than the threshold; determining that the detected step is a mark-time step if the variance sum is less than the threshold; and storing the determined walking step and/or mark-time step in the personal navigator, wherein two of the at least two directions are a forward direction and a downward direction from the pedestrian. - View Dependent Claims (7, 8, 9)
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10. A step detecting method in a personal navigator, comprising the steps of:
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(a) setting a walking step count, a mark-time step, and a step detection count to initial values; (b) acquiring acceleration signals in at least two directions from an accelerometer sensor, and determining whether a step is detected; (c) increasing the step detection count by one, upon detection of a step, calculating variances of the acceleration signals, and summing the variances; (d) increasing the walking step count by one if the variance sum is greater than the threshold and increasing the mark-time step count by one if the variance sum is less than the threshold; (e) counting walking steps, mark-time steps, and step detections by repeating steps (b)-(d), and (f) storing the counted walking steps, mark-time steps and step detections in the personal navigator, wherein two of the at least two directions are a forward direction and a downward direction from the pedestrian. - View Dependent Claims (11)
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Specification