METHOD AND SYSTEM FOR CALIBRATING A PEDOMETER

• US 20170227373A1
• Filed: 02/05/2016
• Published: 08/10/2017
• Est. Priority Date: 02/05/2016
• Status: Active Grant

• Current Assignee: Logitech Europe S A (Logitech International SA)
• Original Assignee: Logitech Europe S A (Logitech International SA)
• Inventors: Bonanno, Daniel, Chardon, Jean-Michel, Theytaz, Olivier
• Granted Patent: US 10,527,452 B2
• Time in Patent Office: Days
• CPC Class Codes: G01C 22/006 Pedometers
• CPC Class Codes: G01C 25/005 initial alignment, calibration or starting-up of inertial devices

Abstract

A method of calibrating a wearable electronic device including a location data unit and an inertial motion unit includes providing a calibration table including default calibration data for the wearable electronic device and determining if location data is available from the location data unit. The method also includes determining if the calibration table has been updated to achieve predetermined thresholds and receiving, from the location data unit, location data associated with the wearable electronic device as a function of time if the location data is available. The method further includes computing a travel speed of the user based on the location data if the location data is available, receiving, from the inertial motion unit, user stride data as a function of time, updating the calibration table using the travel speed and the user stride data, and providing data from the updated calibration table to the user.

Claims

1. A method of calibrating a wearable electronic device including a location data unit and an inertial motion unit, the method comprising:

providing a calibration table including default calibration data for the wearable electronic device;

determining if location data is available from the location data unit;

determining if the calibration table has been updated to achieve predetermined thresholds;

receiving, from the location data unit, location data associated with the wearable electronic device as a function of time if the location data is available;

computing a travel speed of the user based on the location data if the location data is available;

receiving, from the inertial motion unit, user stride data as a function of time;

updating the calibration table using the travel speed and the user stride data; and

providing data from the updated calibration table to the user.

2. The method of claim 1 wherein providing data from the updated calibration table to the user comprises displaying the data to the user.

3. The method of claim 1 wherein the location data and the user stride data are received concurrently.

4. The method of claim 1 further comprising continuing the calibration process by iteratively receiving location data and user stride data as a function of time, computing the travel speed, and further updating the calibration table.

5. The method of claim 1 wherein the calibration table comprises user speed as function of slope and stride frequency.

6. The method of claim 1 wherein the default calibration data includes speed as a function of stride frequency.

7. The method of claim 1 wherein the user stride data comprises a contact time, a step cycle time, a flight time, or a flight time ratio.

8. The method of claim 1 further comprising providing information associated with the calibration table to the user.

9. A method of calibrating a wearable electronic device including a location data unit and an inertial motion unit, the method comprising:

initiating a calibration process;

providing a calibration table including default calibration data for the wearable electronic device;

receiving, from the location data unit, location data associated with the wearable electronic device as a function of time;

receiving, from the inertial motion unit, user stride data as a function of time;

computing a travel speed of the wearable electronic device based on the location data;

updating the calibration table using the travel speed and the user stride data; and

completing the calibration process.

10. The method of claim 9 wherein the location data and the user stride data are received concurrently.

11. The method of claim 9 further comprising continuing the calibration process by iteratively receiving location data and user stride data as a function of time, computing the travel speed, and updating the calibration table.

12. The method of claim 9 wherein the calibration table comprises user speed as function of slope and stride frequency.

13. The method of claim 9 wherein the default calibration data includes speed as a function of stride frequency.

14. The method of claim 9 wherein the user stride data comprises a contact time, a step cycle time, a flight time, or a flight time ratio.

15. The method of claim 9 further comprising providing information associated with the calibration table to the user.

16. The method of claim 15 wherein providing information comprises displaying the information to the user.

17. A method of updating a calibration table for a wearable electronic device including a location data unit and an inertial motion unit, the method comprising:

providing the calibration table including default calibration data for the user;

receiving, from the location data unit, location data associated with the wearable electronic device as a function of time;

computing a travel speed of the user based on the location data;

receiving, from the inertial motion unit, user stride data as a function of time;

receiving, from the inertial motion unit, slope data;

compute stride metrics using the user stride data; and

updating the calibration table using the travel speed and the stride metrics.

18. The method of claim 17 further comprising providing data from the updated calibration table to the user.

19. The method of claim 17 wherein the default calibration data is based on a gender and height of the user.

20. The method of claim 19 wherein the default calibration data is further based on additional demographic information related to the user.

21. The method of claim 17 wherein the user stride data comprises stride frequency.

22. The method of claim 21 wherein updating the calibration table comprises populating travel speed fields as a function of stride frequency and slope data.

23. The method of claim 17 wherein the stride metrics comprise at least one of a contact time ratio or a flight time ratio.

24. The method of claim 17 wherein the slope data is provided using an atmospheric pressure sensor of the inertial motion unit.