Sound leak cancellation for display as sound emitter

Patent metadata

Field	Value
Publication number	US-11238840-B2
Application number	US-202016796515-A
Country	US
Kind code	B2
Filing date	Feb 20, 2020
Priority date	Feb 25, 2019
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

Aspects of the disclosure relate to using a display as a sound emitter and may relate to an electronic device including a display and for sound leak cancellation. A vibration sensor such as an accelerometer is physically coupled to the display and senses the display vibration to provide a signal representing actual acoustic output from the display. The electronic device includes a first actuator physically coupled to the display and configured to cause vibration of the display in response to a first audio signal. The electronic device further includes the vibration sensor configured to output a vibration sensor signal proportional to the vibration of the display. The electronic device further includes a second actuator physically coupled to a portion of the electronic device different from where the first actuator is physically coupled to the display and configured to cause vibration of the portion in response to a second audio signal.

First claim

What is claimed is:

1. An electronic device comprising:
a display;
a first actuator physically coupled to the display and configured to cause vibration of the display in response to a first audio signal provided as an input to the first actuator;
a vibration sensor physically coupled to the display and configured to output a vibration sensor signal proportional to the vibration of the display due to the first actuator; and
a second actuator different from the vibration sensor and physically coupled to a portion of the electronic device different from the display, the portion having a mechanical coupling to the display, the second actuator configured to cause vibration of the portion in response to a second audio signal provided as an input to the second actuator, the second audio signal generated based at least in part on the vibration sensor signal from the vibration sensor.

2. The electronic device of claim 1 , further comprising a processor configured to generate the first audio signal and the second audio signal.

3. The electronic device of claim 2 , wherein the processor is configured to generate the second audio signal to have a waveform that causes a cancellation of the vibration of the portion of the electronic device that is caused by the vibration of the display.

4. The electronic device of claim 2 , wherein the processor is configured to generate the second audio signal to have a waveform that is out of phase with another signal that is based on the vibration sensor signal of the vibration sensor physically coupled to the display.

5. The electronic device of claim 2 , wherein the second audio signal provided by the processor to the second actuator is in phase with another signal that is based on the vibration sensor signal of the vibration sensor physically coupled to the display.

6. The electronic device of claim 2 , wherein the second audio signal provided by the processor to the second actuator has a waveform that aligns vibration of each of the display and the portion of the electronic device with each other.

7. The electronic device of claim 1 , further comprising:
a second vibration sensor physically coupled to the portion of the electronic device and configured to output a second vibration sensor signal proportional to the vibration of the portion.

8. The electronic device of claim 7 , further comprising a processor configured to adjust the second audio signal based on the second vibration sensor signal.

9. The electronic device of claim 8 , wherein the processor is configured to generate the second audio signal to have a waveform that causes a cancellation of the vibration of the portion of the electronic device that is caused by the vibration of the display.

10. The electronic device of claim 1 , wherein the portion of the electronic device comprises a back or a side panel of the electronic device.

11. The electronic device of claim 1 , wherein the portion of the electronic device comprises a second display.

12. The electronic device of claim 1 , wherein the vibration sensor is an accelerometer.

13. The electronic device of claim 1 , wherein the first audio signal is a first amplified electrical audio signal generated by a first audio amplifier based on a first electrical audio signal generated by a processor, wherein the second audio signal is a second amplified electrical audio signal generated by a second audio amplifier based on a second electrical audio signal generated by the processor.

14. The electronic device of claim 1 , further comprising a processor configured to:
convert the vibration sensor signal to a sound pressure level signal;
compare the sound pressure level signal to a first target sound pressure level model representative of audio output characteristics of the display to provide an adjusted sound pressure level signal;
adjust a frequency response of the first audio signal based on the adjusted sound pressure level signal; and
adjust the second audio signal based on the first audio signal.

15. The electronic device of claim 14 , wherein the processor is further configured to adjust the second audio signal based on a second target sound pressure level model representative of audio output characteristics of the portion of the electronic device.

16. The electronic device of claim 14 , further comprising:
a second vibration sensor physically coupled to the portion of the electronic device and configured to output a second vibration sensor signal proportional to the vibration of the portion, wherein the processor is further configured to:
convert the second vibration sensor signal to a second sound pressure level signal;
compare the second sound pressure level signal to a second target sound pressure level model representative of audio output characteristics of the portion of the electronic device to provide a second adjusted sound pressure level signal; and
adjust the second audio signal based on the first audio signal and the second adjusted sound pressure level signal.

17. An electronic device comprising:
a display;
a first means for causing vibration of the display based on a first audio signal to provide acoustic output from the display due to the vibration of the display;
means for sensing the vibration of the display, the vibration sensing means configured to output a vibration sensor signal proportional to the vibration of the display; and
a second means for causing vibration of a portion of the electronic device different than the display based on a second audio signal, the portion having a mechanical coupling to the display, the second means for causing vibration of the portion being different from the vibration sensing means, the second audio signal generated based at least in part on the vibration sensor signal from the vibration sensing means.

18. The electronic device of claim 17 , further comprising means for generating the second audio signal to have a waveform that causes a cancellation of the vibration of the portion of the electronic device that is caused by the vibration of the display, the display mechanically coupled to the portion of the electronic device.

19. The electronic device of claim 17 , further comprising a second means for sensing a vibration of the portion of the electronic device, wherein the second vibration sensing means is configured to output a second vibration sensor signal proportional to the vibration of the portion of the electronic device.

20. A method for producing audio using a display that is part of an electronic device, the method comprising:
vibrating the display using a first actuator physically coupled to the display based on a first audio signal provided as an input to the first actuator;
generating a vibration sensor signal using a vibration sensor physically coupled to the display, the vibration sensor signal proportional to vibration of the display in response to the vibration of the display by the first actuator; and
vibrating a portion of the electronic device different from the display using a second actuator different than the vibration sensor and physically coupled to the portion of the electronic device, the portion having a mechanical coupling to the display, the vibrating the portion using the second actuator based on a second audio signal provided as an input to the second actuator, the second audio signal generated based at least in part on the vibration sensor signal from the vibration sensor.

21. The method of claim 20 , further comprising generating the second audio signal to h

Assignees

• Qualcomm Inc

Inventors

• Bernal Castillo Ricardo De Jesus
• Heimbigner Wade
• Schevciw Andre Gustavo

Classifications

• H04R7/045

  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 title

• H04R29/001

  for loudspeakers (H04R29/007 takes precedence) · CPC title

• H04R3/00

  Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F) · CPC title

• G06F1/1605

  Multimedia displays, e.g. with integrated or attached speakers, cameras, microphones · CPC title

• G10K13/00

  Cones, diaphragms, or the like, for emitting or receiving sound in general (for electromechanical transducers H04R7/00) · CPC title