AUTO-CORRECTION FOR MOBILE RECEIVER WITH POINTING TECHNOLOGY

• US 20110304537A1
• Filed: 06/11/2010
• Published: 12/15/2011
• Est. Priority Date: 06/11/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Eruchimovitch, Baruch, Sheynblat, Leonid
• Granted Patent: US 10,133,411 B2
• Time in Patent Office: Days
• US Class Current: 345/158
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/043 using propagating acoustic waves

Abstract

A mobile station and unattached work area is used with an electronic pen, which includes a transmitter, such as an acoustic transmitter. The mobile station includes a receiver that receives signals from the transmitter and orientation sensors that detect movement of the mobile station. The position of the receiver is calibrated with respect to the unattached work area. Data from the orientation sensors is received when the mobile station, and thus, the receiver is moved with respect to the work area. A transformation matrix is generated based on the data from the orientation sensors, which can be used to correct for the movement of the receiver. The position of the transmitter in the electronic pen is calculated and mapped based on received signals and the transformation matrix and the mapped position is then displayed.

Claims

1. A method comprising:

calibrating a position of a receiver with respect to a work area that is unattached to the receiver, the receiver receives signals from a transmitter;

receiving data from orientation sensors coupled to the receiver when the receiver is moved with respect to the work area;

generating a transformation matrix using the data from the orientation sensors to correct for movement of the receiver with respect to the work area;

calculating and mapping a position of the transmitter with respect to the work area using received signals from the transmitter and the transformation matrix; and

displaying the mapped position of the transmitter.

2. The method of claim 1, wherein the receiver and the orientation sensors are in a mobile station.

3. The method of claim 1, wherein the transmitter is mounted on a writing instrument.

4. The method of claim 3, further comprising receiving orientation signals for an orientation of the writing instrument and using the orientation signals to determine that the writing instrument is in use.

5. The method of claim 1, further comprising receiving orientation signals for an orientation of the transmitter and using the orientation signals to determine the orientation of the transmitter with respect to the receiver.

6. The method of claim 5, further comprising determining the position of the receiver in an external reference frame and determining the position of the transmitter in the external reference frame using the orientation of the transmitter with respect to the receiver and the position of the receiver in the external reference frame.

7. The method of claim 1, wherein the orientation sensors are accelerometers.

8. The method of claim 1, wherein the receiver is an acoustic receiver and the transmitter is an acoustic transmitter.

9. The method of claim 8, wherein the acoustic receiver receives ultrasonic signals.

10. The method of claim 1, further comprising using the received data from the orientation sensors to compensate for an extraneous source of movement of the receiver.

11. The method of claim 1, further comprising receiving orientation signals for an orientation of the transmitter and using the received orientation signals to compensate for an extraneous source of movement of the transmitter.

12. The method of claim 1, further comprising:

generating a second transformation matrix using the received data from the orientation sensors to correct for additional movement of the receiver with respect to the work area;

calculating and mapping the position of the transmitter with respect to the work area using received signals from the transmitter on the transmitter and the second transformation matrix; and

displaying the mapped position of the transmitter.

13. The method of claim 1, wherein calibrating the position of the receiver is performed when the receiver is an initial receiver coordinate system and after the movement of the receiver the receiver is in a new receiver coordinate system, and wherein the transformation matrix is used to transform a calculated position of the transmitter in the new receiver coordinate system into the position of the transmitter in the initial receiver coordinate system.

14. The method of claim 1, wherein calibrating the position of the receiver is performed when the receiver is an initial receiver coordinate system and after the movement of the receiver the receiver is in a new receiver coordinate system, and wherein the transformation matrix is used to transform previously calculated positions of the transmitter in the initial receiver coordinate system into positions in the new receiver coordinate system.

15. A mobile station comprising:

a receiver for receiving signals from a transmitter;

orientation sensors for detecting changes in an orientation of the receiver;

a display;

a processor connected to the receiver, the orientation sensors and the display;

memory connected to the processor; and

software held in the memory and run in the processor to cause the processor to calibrate a position of the receiver with respect to a work area that is unattached to the receiver, generate a transformation matrix using data from the orientation sensors to correct for movement of the receiver with respect to the work area;

calculate and map the position of the transmitter with respect to the work area using signals received by the receiver and the transformation matrix; and

display the mapped position of the transmitter in the display.

16. The mobile station of claim 15, wherein the transmitter is mounted on a writing instrument.

17. The mobile station of claim 16, wherein signals from the transmitter comprises orientation signals for the orientation of the writing instrument, wherein the software causes the processor to use the received orientation signals to determine that the writing instrument is in use.

18. The mobile station of claim 15, wherein signals from the transmitter comprises orientation signals for the orientation of the transmitter, wherein the software causes the processor to use the received orientation signals to determine the orientation of the transmitter with respect to the receiver.

19. The mobile station of claim 18, further comprising a satellite positioning system receiver coupled to provide received satellite positioning system signals to the processor, wherein the software causes the processor to use the received satellite positioning system signals to determine the position of the receiver in an external reference frame, the software further causes the processor to determine the position of the transmitter in the external reference frame using the orientation of the transmitter with respect to the receiver and the position of the receiver in the external reference frame.

20. The mobile station of claim 15, wherein the orientation sensors are accelerometers.

21. The mobile station of claim 15, wherein the receiver is an acoustic receiver and the transmitter is an acoustic transmitter.

22. The mobile station of claim 21, wherein the acoustic receiver receives ultrasonic signals.

23. The mobile station of claim 15, further comprising using the data from the orientation sensors to compensate for an extraneous source of movement of the receiver.

24. The mobile station of claim 15, wherein signals from the transmitter comprises orientation signals for the orientation of the transmitter, wherein the software causes the processor to use the received orientation signals to compensate for an extraneous source of movement of the transmitter.

25. The mobile station of claim 15, wherein the software held in the memory and run in the processor causes the processor to discontinue calculating and mapping the position of the transmitter while the receiver is moving with respect to the work area.

26. The mobile station of claim 15, wherein the software held in the memory and run in the processor causes the processor to generate a second transformation matrix using the data from the orientation sensors to correct for additional movement of the receiver with respect to the work area;

calculate and map the position of the transmitter with respect to the work area using received signals from the transmitter and the second transformation matrix; and

display the mapped position of the transmitter in the display.

27. The mobile station of claim 15, wherein the position of the receiver is calibrated performed when the receiver is an initial receiver coordinate system and after the movement of the receiver the receiver is in a new receiver coordinate system, and wherein the transformation matrix is used to transform a calculated position of the transmitter in the new receiver coordinate system into the position of the transmitter in the initial receiver coordinate system.

28. The mobile station of claim 15, wherein the position of the receiver is calibrated performed when the receiver is an initial receiver coordinate system and after the movement of the receiver the receiver is in a new receiver coordinate system, and wherein the transformation matrix is used to transform previously calculated positions of the transmitter in the initial receiver coordinate system into positions in the new receiver coordinate system.

29. A system comprising:

means for calibrating a position of a receiver with respect to a work area that is unattached to the receiver, the receiver receives signals from a transmitter;

means for compensating for movement of the receiver with respect to the work area;

means for calculating and mapping the position of the transmitter with respect to the work area using received signals from the transmitter and the means for compensating for movement of the receiver with respect to the work area; and

means for displaying the mapped position of the transmitter.

30. The system of claim 29, wherein the means for compensating comprises:

means for detecting movement of the receiver; and

means for generating a transformation matrix from the calibrated position to a new position using the means for detecting movement.

31. The system of claim 29, wherein the transmitter is mounted on a writing instrument.

32. The system of claim 29, wherein the receiver is an acoustic receiver and the transmitter is an acoustic transmitter.

33. The system of claim 32, wherein the acoustic receiver receives ultrasonic signals.

34. A computer-readable medium including program code stored thereon, comprising:

program code to calibrate a position of a receiver with respect to a work area that is unattached to the receiver;

program code to generate a transformation matrix using data from orientation sensors to correct for movement of the receiver with respect to the work area;

program code to calculate and map the position of a transmitter with respect to the work area using signals received by the receiver and the transformation matrix; and

program code to display the mapped position of the transmitter.