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1. (WO2017001688) SYSTEM AND METHOD FOR PROCESSING A FOOT ACCELERATION SIGNAL
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CLAIMS

1. A system configured to process a first acceleration signal, the system comprising:

at least one acceleration sensor for measuring

acceleration of a foot during a movement of the foot from a first position of the foot on a surface to a second position of the foot on the surface and for generating the first

acceleration signal comprising a plurality of acceleration values in response to measuring the acceleration;

a signal processing system configured to

identify one or more acceleration values in the first acceleration signal associated with an impact of the foot on the surface ;

process the identified one or more acceleration values to obtain a processing result.

2. The system of claim 1, wherein the processing of the identified one or more acceleration values involves

calculating one or more acceleration values in a peak region of the first acceleration signal to obtain a second acceleration signal that is smooth in a region associated with the impact of the foot on the surface.

3. The system of claim 2, wherein the processing comprises: double integration of the second acceleration signal measured between times associated with the first position of the foot and the second position of the foot;

determining, from the second acceleration signal, a step distance between the first and second position of the foot as the processing result.

4. The system of claim 3, wherein determining the step distance comprises:

single integration of the second acceleration signal measured between times associated with the first position of the foot and the second position of the foot; determining, from the second acceleration signal, a speed of the foot between the first position of the foot and the second position of the foot;

applying a boundary condition that the speed of the foot in either the first position or in the second position of the foot is zero;

determining an acceleration error by equalizing the acceleration error with the speed of the foot in either the first or in the second position of the foot divided by a time duration of the movement of the foot from the first position of the foot to the second position of the foot;

determining a step distance error by double integrating the acceleration error between times associated with the first position of the foot to the second position of the foot;

compensating for the step distance error.

5. The system according to one or more of the claims 1-4, wherein the identified one or more acceleration values in the first acceleration signal associated with the impact of the foot on the surface are identified by applying a condition to neighboring acceleration values in the first acceleration signal .

6. The system according to one or more of the

preceding claims, wherein the signal processing system is configured to determine user information as the processing result from the identified one or more acceleration values in the first acceleration signal.

7. The system according to claim 6, wherein the user information comprises at least one of exercise information for the user and material characteristics of footwear worn on the foot .

8. The system according to one or more of the

preceding claims wherein the first position of the foot is identified by applying a condition to further acceleration values, that are obtained in response to measuring an

acceleration of the foot in a direction substantially

perpendicular to the surface.

9. The system according to one or more of the

preceding claims, wherein the system comprises:

a first component comprising the acceleration sensor and is attachable to the foot;

a second component comprising at least a part of the signal processing system;

wherein the first and second component are separate components; and wherein the first and second component are configured to connect to each other such that at least the processing result is obtained in the second component.

10. A foot-wearable structure comprising at least a part of the system of one or more of the preceding claims.

11. A computer-implemented method for processing a first acceleration signal, wherein the method comprises the steps of:

measuring an acceleration of a foot during a movement of the foot from a first position of the foot on a surface to a second position of the foot on the surface and generating the first acceleration signal comprising a plurality of acceleration values in response to measuring the acceleration with at least one acceleration sensor;

processing the first acceleration signal with a signal

processing system, wherein the processing involves:

identifying one or more acceleration values in the first acceleration signal associated with an impact of the foot on the surface;

processing the identified one or more acceleration values to obtain a processing result.

12. The method of claim 11, further comprising steps in the signal processing system as defined in claim 2-9.

13. A computer program or suite of computer programs comprising at least one software code portion or a computer program product storing at least one software code portion, the software code portion, when run on a computer system, being configured for processing the first acceleration signal as defined in claim 11 or 12.