DETECTION OF TYPE OF OBJECT USED TO PROVIDE A TOUCH CONTACT INPUT

• US 20140247230A1
• Filed: 07/18/2013
• Published: 09/04/2014
• Est. Priority Date: 07/18/2012
• Status: Active Grant

• Current Assignee: Sentons, Inc.
• Original Assignee: Sentons, Inc.
• Inventors: Sheng, Samuel W., Shih, Shih-Ming, Altekar, Shirish A.
• Granted Patent: US 9,189,109 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0436 in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate

Abstract

Determining a touch contact object type is disclosed. A signal detected due to a touch input object contacting a touch input surface is received. At least a portion of the received signal is compared with one or more signatures of one or more touch input object types. A type of the touch input object contacting the surface is determined based at least in part on the comparison.

Claims

1. A system for determining a touch contact object type, comprising:

a communication interface configured to receive a signal detected due to a touch input object contacting a touch input surface; and

a processor coupled with the communication interface and configured to;

compare at least a portion of the received signal with one or more signatures of one or more touch input object types; and

determine a type of the touch input object contacting the surface based at least in part on the comparison.

2. The system of claim 1, wherein the received signal was detected by a transducer.

4. The system of claim 1, wherein the determining the type of touch input object includes determining whether the touch input object type is a finger object type.

5. The system of claim 1, wherein the determining the type of touch input object includes determining whether the touch input object type is a stylus object type.

6. The system of claim 5, wherein if it is determined that the touch input object type is the stylus, a handwriting detection is invoked.

7. The system of claim 1, wherein the determined type of the touch input object is used at least in part to initiate a device behavior based on the determined type.

8. The system of claim 1, wherein the determined type is one of a plurality of determined types including a determined type for each touch contact of a multi-touch input.

9. The system of claim 1, wherein the one or more signatures include one or more waveform signatures.

10. The system of claim 1, wherein comparing at least the portion of the received signal with the one or more signatures includes matching in a time domain by correlating the at least a portion of the received signal with one or more waveforms of the one or more signatures.

11. The system of claim 1, wherein comparing at least the portion of the received signal with the one or more signatures includes frequency-domain matching at least a portion of the received signal with one or more frequency-domain spectra of the one or more signatures.

12. The system of claim 1, wherein comparing at least the portion of the received signal with the one or more signatures includes wavelet-domain matching at least a portion of the received signal with one or more wavelet-domain transforms of the one or more signatures.

13. The system of claim 1, wherein the received signal was detected by converting a detected vibrational energy to the received signal.

14. The system of claim 1, wherein one or more components of the system are powered down while awaiting to receive the received signal detected due to the touch input object contacting the touch input surface.

15. The system of claim 1, wherein comparing at least the portion of the received signal with the one or more signatures includes comparing a predetermined amount of time of the received signal with the one or more signatures.

16. The system of claim 1, wherein the processor is further configured to filter a background noise included in the received signal.

17. The system of claim 16, wherein filtering the background noise includes measuring a rate of spectral change of at least a portion of the received signal.

18. The system of claim 17, wherein measuring the rate of spectral change includes computing a fast Fourier transform of at least a portion of the received signal.

19. The system of claim 1, wherein the received signal includes an acoustic signal.

3. The system of claim 3, wherein the transducer is coupled to a medium of the touch input surface.

20. A method for determining a touch contact object type, comprising:

receiving a signal detected due to a touch input object contacting a touch input surface;

using a processor to compare at least a portion of the received signal with one or more signatures of one or more touch input object types; and

determining a type of the touch input object contacting the surface based at least in part on the comparison.

21. A computer program product for determining a touch contact object type, the computer program product being embodied in a tangible computer readable storage medium and comprising computer instructions for:

receiving a signal detected due to a touch input object contacting a touch input surface;

comparing at least a portion of the received signal with one or more signatures of one or more touch input object types; and

determining a type of the touch input object contacting the surface based at least in part on the comparison.