STATE DETECTION DEVICE, ELECTRONIC APPARATUS, AND PROGRAM

• US 20130204572A1
• Filed: 02/05/2013
• Published: 08/08/2013
• Est. Priority Date: 02/07/2012
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: SATO, Shinya
• Application Number:
  US13/759,460
• Publication Number:
  US 20130204572A1
• Time in Patent Office: Days
• US Class Current: 702/141
• CPC Class Codes: G01C 21/16 by integrating acceleration or speed, i.e. inertial navigation
• CPC Class Codes: G01C 22/006 Pedometers
• CPC Class Codes: G01P 3/00 Measuring linear or angular speed; Measuring differences of linear or angular speeds G01P5/00 - G01P11/00 take precedence; direction and speed indication G01P13/045; counting mechanisms G06M
• CPC Class Codes: G06F 17/00 Digital computing or data processing equipment or methods, specially adapted for specific functions information retrieval, database structures or file system structures therefor G06F16/00

Abstract

A state detection device includes a horizontal direction component extracting unit that obtains a horizontal direction component of acceleration detected by an acceleration sensor and a movement direction calculating unit that calculates a movement direction on the basis of the horizontal direction component. The movement direction calculating unit performs a process of extracting a DC component for movement direction information which is obtained on the basis of the horizontal direction component to calculate the movement direction.

Claims

1. A state detection device comprising:

a horizontal direction component extracting unit that obtains a horizontal direction component of acceleration detected by an acceleration sensor; and

a movement direction calculating unit that calculates a movement direction on the basis of the horizontal direction component,

the movement direction calculating unit performing a process of extracting a DC component for movement direction information which is obtained on the basis of the horizontal direction component to calculate the movement direction.

2. The state detection device according to claim 1, further comprising:

a change information acquiring unit that acquires change information corresponding to a change in the movement direction,

wherein the movement direction calculating unit adjusts a parameter which is used in the extraction process on the basis of the change information.

3. The state detection device according to claim 2,

wherein the movement direction calculating unit includes a DC component extracting and filtering unit that performs a filtering process of extracting the DC component, and

the movement direction calculating unit adjusts a gain of a filter used in the DC component extracting and filtering unit as the parameter used in the extraction process.

4. The state detection device according to claim 3,

wherein the DC component extracting and filtering unit performs a process based on the gain for a difference between an input value at a predetermined time point and an output value at a time point that is one time point earlier than the predetermined time point to calculate an intermediate value, and

the DC component extracting process is performed using a difference between the intermediate value and the input value at the predetermined time point as the output value at the predetermined time point.

5. The state detection device according to claim 3,

wherein the movement direction calculating unit reduces the value of the gain as the magnitude of the change in the movement direction indicated by the change information increases.

6. The state detection device according to claim 2,

wherein the change information acquiring unit acquires a change in a rotation angle of an apparatus provided with the acceleration sensor as the change information.

7. The state detection device according to claim 2, further comprising:

a step detecting unit that detects first to N-th (N is an integer equal to or greater than

     2) steps as steps in walking or running,

wherein the change information acquiring unit averages the change information at an i-th (1≦

i≦

N) step corresponding to one of a right foot and a left foot and the change information at a j-th (1≦

j≦

N, i≠

j) step corresponding to the other step of the right foot and the left foot which is different from the i-th step and outputs the averaged change information.

8. The state detection device according to claim 7,

wherein the movement direction calculating unit averages the movement direction information at an m-th (1≦

m≦

N) step corresponding to one of the right foot and the left foot and the movement direction information at an n-th (1≦

n≦

N, m≠

n) step corresponding to the other step of the right foot and the left foot which is different from the m-th step and performs the process of extracting the DC component for the averaged information to calculate the movement direction.

9. The state detection device according to claim 1,

wherein the horizontal direction component extracting unit extracts, as the horizontal direction component, a first coordinate axis component and a second coordinate axis component different from the first coordinate axis component,

the movement direction calculating unit performs the DC component extracting process for a first movement direction information item which is obtained on the basis of the first coordinate axis component and performs the DC component extracting process for a second movement direction information item which is obtained on the basis of the second coordinate axis component, and

the movement direction calculating unit calculates the movement direction on the basis of the first movement direction information item subjected to the extraction process and the second movement direction information item subjected to the extraction process.

10. The state detection device according to claim 1, further comprising:

a filtering unit that performs a filtering process of removing a DC component for the horizontal direction component of the detected acceleration,

wherein the movement direction calculating unit performs the DC component extracting process for the movement direction information which is obtained on the basis of the horizontal direction component subjected to the filtering process of removing the DC component to calculate the movement direction.

11. An electronic apparatus comprising the state detection device according to claim 1.

12. An electronic apparatus comprising the state detection device according to claim 2.

13. An electronic apparatus comprising the state detection device according to claim 3.

14. An electronic apparatus comprising the state detection device according to claim 4.

15. An electronic apparatus comprising the state detection device according to claim 5.

16. An electronic apparatus comprising the state detection device according to claim 6.

17. An electronic apparatus comprising the state detection device according to claim 7.

18. An electronic apparatus comprising the state detection device according to claim 8.

19. An electronic apparatus comprising the state detection device according to claim 9.

20. A program that causes a computer to function as:

a horizontal direction component extracting unit that obtains a horizontal direction component of acceleration detected by an acceleration sensor; and

a movement direction calculating unit that calculates a movement direction on the basis of the horizontal direction component,

the movement direction calculating unit performing a process of extracting a DC component for movement direction information which is obtained on the basis of the horizontal direction component to calculate the movement direction.