Method of distinguishing running from walking

• US 7,930,135 B2
• Filed: 12/23/2008
• Issued: 04/19/2011
• Est. Priority Date: 07/10/2008
• Status: Active Grant

• Current Assignee: Well Being Digital Limited
• Original Assignee: Perception Digital Limited (Atom Xquare Corp. Ltd.)
• Inventors: Ma, Chor-Tin, Chan, Kai-Kin
• Primary Examiner(s): Lau; Tung S
• Application Number:
  US12/342,678
• Publication Number:
  US 20100010774A1
• Time in Patent Office: 847 Days
• Field of Search: 702/160
• US Class Current: 702/160
• CPC Class Codes: G01C 22/006 Pedometers

Abstract

A person'"'"'s exercise monitored using an accelerometer to detect and count the steps of the person. Furthermore, acceleration profiling distinguishes walking from running and total distance covered in the exercise is estimated using different stride lengths for walking and running. The person'"'"'s pace may be maintained using a music playback unit with an adjustable rate of playback to influence the pace of the person with the music tempo.

Claims

1. A method of distinguishing running from walking, comprising:

attaching an accelerometer to a person, wherein the accelerometer is a three-axis accelerometer sensing accelerations along each of three orthogonal axes so that the accelerometer is operative regardless of whether the accelerometer is upright when attached to the person;

detecting, with the accelerometer, fluctuating whole-body accelerations experienced by the body of the person when moving on foot, wherein

fluctuating accelerations within the whole-body accelerations detected by the accelerometer correspond to walking by the person, and

free-fall movements of the body of the person within the fluctuating whole-body accelerations detected by the accelerometer correspond to running by the person; and

determining whether the fluctuating whole-body accelerations comprise a free-fall movement of the body of the person, thereby distinguishing running by the person from walking by the person.

2. The method as claimed in claim 1 wherein

the free-fall movement of the body of the person is indicated by a fluctuating whole-body acceleration detected by the accelerometer of less than 0.5 g,

0 g is a free-fall movement, and

g is gravitational acceleration.

3. The method as claimed in claim 1 wherein

the free-fall movement is indicated by a composite acceleration magnitude detected by the accelerometer and approaching 0 g,

0 g is a free-fall moment, and

g is gravitational acceleration.

4. The method of as claimed in claim 1, further comprising measuring peaks of the fluctuating whole-body acceleration detected by the accelerometer to distinguish running from walking, wherein

a peak in a range from at least 0.1 g to no more than ⅔

g indicates walking,

a peak greater than ⅔

g indicates running, and

g is gravitational acceleration.

5. The method as claimed in claim 1 including adjusting the accelerometer to output a 0 g acceleration value in a free-fall so that a free-fall movement of the body of the person is indicated by a fluctuating whole-body acceleration of less than 0.5 g, wherein g is gravitational acceleration.