Cadence detection based on inertial harmonics
First Claim
1. A method of determining a user cadence from an inertial signal generated by an inertial sensor disposed in a device secured to at least some portion of an ear of a user, the inertial signal comprising one or more frequency components, the method comprising:
- determining, using a peak frequency circuit disposed in the device and operatively connected to the inertial sensor, a spectral signal based on a frequency transform of the inertial signal generated by the inertial sensor responsive to limb movement of the user;
determining, using the peak frequency circuit, a peak frequency of the spectral signal, said peak frequency corresponding to a frequency component of the inertial signal having a largest amplitude;
determining, using a cadence processor disposed in the device and operatively connected to a frequency comparison circuit, at least one frequency threshold for one or more frequency thresholds based on a previous user cadence of the user;
comparing, using the frequency comparison circuit disposed in the device and operatively connected to the peak frequency circuit, the peak frequency to at least one of the one or more frequency thresholds;
determining, using the cadence processor, the user cadence based on the peak frequency and the one or more frequency threshold comparisons, said user cadence representing a movement of one or more limbs of the user; and
outputting the determined user cadence to an output circuit disposed in the device and operatively connected to the cadence processor.
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Accused Products
Abstract
The method and apparatus disclosed herein determine a user cadence from the output of an inertial sensor mounted to or proximate the user'"'"'s body. In general, the disclosed cadence measurement system determines the user cadence based on frequency measurements acquired from an inertial signal output by the inertial sensor. More particularly, a cadence measurement system determines a user cadence from an inertial signal generated by an inertial sensor, where the inertial signal comprises one or more frequency components. The cadence measurement system determines a peak frequency of the inertial signal, where the peak frequency corresponds to the frequency component of the inertial signal having the largest amplitude. After applying the peak frequency to one or more frequency threshold comparisons, the cadence measurement system determines the user cadence based on the peak frequency and the frequency threshold comparison(s).
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Citations
18 Claims
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1. A method of determining a user cadence from an inertial signal generated by an inertial sensor disposed in a device secured to at least some portion of an ear of a user, the inertial signal comprising one or more frequency components, the method comprising:
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determining, using a peak frequency circuit disposed in the device and operatively connected to the inertial sensor, a spectral signal based on a frequency transform of the inertial signal generated by the inertial sensor responsive to limb movement of the user; determining, using the peak frequency circuit, a peak frequency of the spectral signal, said peak frequency corresponding to a frequency component of the inertial signal having a largest amplitude; determining, using a cadence processor disposed in the device and operatively connected to a frequency comparison circuit, at least one frequency threshold for one or more frequency thresholds based on a previous user cadence of the user; comparing, using the frequency comparison circuit disposed in the device and operatively connected to the peak frequency circuit, the peak frequency to at least one of the one or more frequency thresholds; determining, using the cadence processor, the user cadence based on the peak frequency and the one or more frequency threshold comparisons, said user cadence representing a movement of one or more limbs of the user; and outputting the determined user cadence to an output circuit disposed in the device and operatively connected to the cadence processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A cadence measurement system disposed in a device configured to secure to at least some portion of an ear of a user and configured to determine a user cadence, the cadence measurement system comprising:
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an inertial sensor disposed in the device and configured to output an inertial signal responsive to limb movement of the user, said inertial signal comprising one or more frequency components; a cadence circuit disposed in the device and operatively connected to the inertial sensor, said cadence circuit comprising; a peak frequency circuit operatively connected to the inertial sensor and configured to determine; a spectral signal based on a frequency transform of the inertial signal; and a peak frequency of the spectral signal, said peak frequency corresponding to a frequency component of the inertial signal having a largest amplitude; a cadence processor operatively coupled to the peak frequency circuit and configured to determine at least one frequency threshold for one or more frequency thresholds based on a previous user cadence of the user; a frequency comparison circuit operatively coupled to the peak frequency circuit and the cadence processor, the frequency comparison circuit configured to compare the peak frequency to at least one of the one or more frequency thresholds; and wherein the cadence processor is further configured to determine the user cadence based on the peak frequency and the one or more frequency threshold comparisons, said user cadence representing a movement of one or more limbs of the user; and an output circuit disposed in the device and operatively connected to the cadence circuit, the output circuit configured to output the determined user cadence. - View Dependent Claims (15)
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16. A method of determining a user cadence from an inertial signal generated by an inertial sensor disposed in a device secured to at least some portion of an ear of a user, the inertial signal comprising one or more frequency components, the method comprising:
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determining, using a peak frequency circuit disposed in the device and operatively connected to the inertial sensor, a spectral signal based on a frequency transform of the inertial signal generated by the inertial sensor responsive to limb movement of the user; determining, using the peak frequency circuit, a peak frequency of the spectral signal, said peak frequency corresponding to a frequency component of the inertial signal having a largest amplitude; comparing, using a frequency comparison circuit disposed in the device and operatively connected to the peak frequency circuit, the peak frequency to one or more frequency thresholds; determining, using a power circuit disposed in the device and operatively connected to the inertial sensor, a power of the inertial signal, said power of said inertial signal encompassing a plurality of the one or more frequency components of the inertial signal; comparing, using a power comparison circuit disposed in the device and operatively connected to the power circuit and the frequency comparison circuit, the power to a power threshold; determining, using a cadence processor disposed in the device and operatively connected to the frequency comparison circuit, the user cadence based on the peak frequency, the one or more frequency threshold comparisons, and the comparison between the power and the power threshold, said user cadence representing a movement of one or more limbs of the user; and outputting the determined user cadence to an output circuit disposed in the device and operatively connected to the cadence processor. - View Dependent Claims (17)
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18. A cadence measurement system disposed in a device configured to secure at least some portion of an ear of a user and configured to determine a user cadence, the cadence measurement system comprising:
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an inertial sensor disposed in the device and configured to output an inertial signal responsive to limb movement of the user, said inertial signal comprising one or more frequency components; a cadence circuit disposed in the device and operatively connected to the inertial sensor, said cadence circuit comprising; a peak frequency circuit operatively connected to the inertial sensor and configured to determine; a spectral signal based on a frequency transform of the inertial signal; and a peak frequency of the spectral signal, said peak frequency corresponding to a frequency component of the inertial signal having a largest amplitude; a frequency comparison circuit operatively connected to the peak frequency circuit and configured to compare the peak frequency to one or more frequency thresholds; a power circuit operatively connected to the inertial sensor and configured to determine a power of the inertial signal, said power of said inertial signal encompassing a plurality of the one or more frequency components of the inertial signal; a power comparison circuit operatively connected to the power circuit and the frequency comparison circuit, the power comparison circuit configured to compare the power to a power threshold; a cadence processor operatively connected to the frequency comparison circuit and configured to determine the user cadence based on the peak frequency, the one or more frequency threshold comparisons, and the comparison between the power and the power threshold, said user cadence representing a movement of one or more limbs of the user; and an output circuit disposed in the device and operatively connected to the cadence circuit, the output circuit configured to output the determined user cadence.
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Specification