TOUCH INPUT SURFACE SPEAKER

• US 20140022189A1
• Filed: 03/14/2013
• Published: 01/23/2014
• Est. Priority Date: 07/18/2012
• Status: Active Grant

• Current Assignee: Sentons, Inc.
• Original Assignee: Sentons, Inc.
• Inventors: Sheng, Samuel W., Shih, Shih-Ming, Lynn, Lapoe E.
• Granted Patent: US 9,078,066 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• 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
• CPC Class Codes: G06F 3/0436 in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate
• CPC Class Codes: H04R 1/00 Details of transducers, loudspeakers or microphones
• CPC Class Codes: H04R 17/00 Piezoelectric transducers; Electrostrictive transducers piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners H10N30/00
• CPC Class Codes: H04R 2499/15 Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
• CPC Class Codes: H04R 29/00 Monitoring arrangements; Testing arrangements for hearing aids H04R25/30; detection of loudspeaker connection H04R5/04; sound-field adaptation dependent on speaker detection H04S7/308
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones
• CPC Class Codes: H04R 7/045 using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
• CPC Class Codes: H04R 9/066 using the principle of inertia

Abstract

Processing an audio signal is disclosed. A source audio signal to be rendered by a touch input medium is received. An indication of an event where the touch input medium has been contacted at a location on the touch input medium such that rendering of the source audio signal by the touch input medium is affected by the contact is received. At least a portion of the source audio signal is modified based on an expected effect of the contact on the touch input medium determined using the indication of the detector.

Claims

1. A system for processing an audio signal, comprising:

an interface that receives a source audio signal to be rendered by a touch input medium;

a detector that indicates an event where the touch input medium has been contacted at a location on the touch input medium such that rendering of the source audio signal by the touch input medium is affected by the contact; and

a signal processor that modifies at least a portion of the source audio signal based on an expected effect of the contact on the touch input medium determined using the indication of the detector.

2. The system of claim 1, wherein rendering the source audio signal includes vibrating the touch input medium to emit sound.

3. The system of claim 1, further comprising a sensor interface configured to receive a detected audio signal from a sensor coupled to the touch input medium.

4. The system of claim 3, wherein the sensor includes a piezoelectric transducer.

5. The system of claim 3, wherein the detected audio signal includes at least a portion of the source audio signal that has been rendered by the touch input medium and distorted by the contact.

6. The system of claim 3, wherein the detected audio signal is filtered or equalized to remove signal frequencies associated with touch input location detection.

7. The system of claim 3, wherein the expected effect of the contact is determined at least in part by comparing the source audio signal with the detected audio signal.

8. The system of claim 7, wherein comparing the source audio signal with the detected audio signal includes subtracting the detected audio signal from the source audio signal.

9. The system of claim 7, wherein modifying at least a portion of the source audio signal includes modifying the source audio signal using a result of the comparison.

10. The system of claim 1, further comprising a sensor interface configured to receive a plurality of detected audio signals from a plurality of sensors coupled to the touch input medium.

11. The system of claim 10, wherein the expected effect of the contact is determined at least in part by determining a representative detected signal using the plurality of detected audio signals.

12. The system of claim 11, wherein determining the representative detected signal includes selecting a detected audio signal among the plurality of detected audio signals using the indication of the detector.

13. The system of claim 12, wherein using the indication of the detector to select the signal includes determining a physical distance between the contact location and a location of a sensor that detected the detected audio signal.

14. The system of claim 11, wherein determining the representative detected signal includes combining signals in the plurality of detected audio signals to determine the representative detected signal.

15. The system of claim 14, wherein combining signals in the plurality of detected audio signals includes weighting the signals in the plurality of detected audio signals using the indication of the detector.

16. The system of claim 1, wherein modifying at least a portion of the source audio signal includes modifying the source audio signal to compensate for the expected effect of the contact.

17. The system of claim 1, wherein modifying at least a portion of the source audio signal includes using a least mean squares adaptive filter.

18. The system of claim 1, wherein the expected effect of the contact is determined at least in part by using the indication of the detector to locate one or more predetermined factors stored in a data structure and used to determine the expected effect.

19. The system of claim 18, wherein the factors include one or more of the following:

a filter coefficient, an amplitude change factor, a phase change factor, a delay factor, and a frequency change factor.

20. The system of claim 18, wherein modifying at least a portion of the source audio signal includes using the predetermined factors to filter the source audio signal.

21. The system of claim 18, wherein modifying at least a portion of the source audio signal includes using the predetermined factors as coefficients of a finite impulse response filter to filter the source audio signal.

22. The system of claim 1, wherein the expected effect of the contact is determined at least in part by using the indication of the detector to dynamically calculate one or more factors used to determine the expected effect.

23. A method for processing an audio signal, comprising:

receiving a source audio signal to be rendered by a touch input medium;

receiving an indication of an event where the touch input medium has been contacted at a location on the touch input medium such that rendering of the source audio signal by the touch input medium is affected by the contact; and

using a processor to modify at least a portion of the source audio signal based on an expected effect of the contact on the touch input medium determined using the indication of the detector.

24. A computer program product for processing an audio signal, the computer program product being embodied in a tangible computer readable storage medium and comprising computer instructions for:

receiving a source audio signal to be rendered by a touch input medium;

receiving an indication of an event where the touch input medium has been contacted at a location on the touch input medium such that rendering of the source audio signal by the touch input medium is affected by the contact; and

modifying at least a portion of the source audio signal based on an expected effect of the contact on the touch input medium determined using the indication of the detector.