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 for calculating 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.
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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
14 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 for calculating 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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; and
determining that the detected step is a mark-time step if the variance sum is less than the threshold. - View Dependent Claims (8, 9, 10, 11)
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12. 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; and
(e) counting walking steps, mark-time steps, and step detections by repeating steps (b)-(d). - View Dependent Claims (13, 14)
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Specification