METHOD AND APPARATUS FOR SENSOR BASED PEDESTRIAN MOTION DETECTION IN HAND-HELD DEVICES
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Abstract
A method and apparatus are described for sensor based detection of pedestrian motion. Based on a 3-axis accelerometer, the apparatus may differentiate between walking, running, standing still, or any random movement that the user may perform. The method may comprise the steps of performing a time domain analysis and a frequency domain analysis. The time domain analysis may be based on a Teager-Kaiser Energy Operator. The frequency domain analysis may be based on a fast Fourier transform. A apparatus for detecting pedestrian motion may comprises an accelerometer, an operator, a Teager-Kaiser Energy Operator, a first peak detection, a second peak detection, a buffer, a fast Fourier transform, a memory and a look-up table. The apparatus may be a hand held device.
16 Citations
40 Claims
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1-20. -20. (canceled)
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21. A computer-implemented method of detecting motion of a pedestrian, the method performed by one or more processors and comprising the steps of:
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determining a magnitude of acceleration; performing a time domain analysis on the acceleration magnitude to generate a time-based representation of the acceleration; performing a frequency domain analysis on the acceleration magnitude to generate a frequency-based representation of the acceleration; and determining whether the pedestrian is in motion in response to the time-based representation and the frequency-based representation. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An apparatus for detecting motion of a pedestrian, the pedestrian motion including hand motion and step motion, the apparatus comprising:
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an accelerometer having an output to generate a magnitude of acceleration; an energy operator, coupled to the accelerometer, to generate a time-based representation of the acceleration; an estimator, coupled to the accelerometer, to generate a frequency-based representation of the acceleration; a first peak detection circuit, coupled to the energy operator, to determine whether a number of first peaks of the time-based representation exceed a first threshold; a second peak detection circuit, coupled to the estimator, to determine whether a number of second peaks of the frequency-based representation exceed a second threshold; and a look-up table, coupled to the first and second peak detection circuits, to compare the first peaks and one of the second peaks with predetermined values stored in the look-up table. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification