Display Speaker Feedback Control for Echo and Sound Leak Cancellation
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Solution Overview
Problem
Electronic devices face challenges in providing high-quality audio output without occupying space, especially when using displays as sound emitters, as they often suffer from echo issues and sound leakage due to the unique vibration characteristics of the display, which are difficult to accurately represent for feedback and cancellation.
Innovation Solution
Incorporating a vibration sensor coupled to the display to generate a vibration sensor signal that accurately represents the acoustic output, allowing for feedback loops to improve audio quality and echo cancellation, and using additional actuators to cancel vibrations on other surfaces to prevent sound leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a display is used as a sound emitter to provide audio output, then the space for the display can be maximized, but echo and sound leakage issues arise due to the unique vibration characteristics of the display
Solution Approach 1:
The patent implements feedback control by using vibration sensors to detect the actual vibration characteristics of the display and other surfaces, then using this information to generate cancellation signals that counteract unwanted vibrations and sound leakage, thereby resolving the echo and sound leakage problems while maintaining full display area
Solution Approach 2:
The patent applies preliminary anti-action by generating anti-phase vibration signals before the unwanted sound leakage occurs. The system proactively creates cancellation signals that are opposite in phase to the expected harmful vibrations, preventing echo and sound leakage before they can propagate
2Reliability
If vibration sensors and feedback loops are added to improve audio quality and echo cancellation, then audio output quality is enhanced, but device complexity increases
Solution Approach 1:
The patent applies universality by using the display itself as both the visual output device and the sound emission surface. Additionally, existing device components like vibration motors are made multi-functional by having them serve both their original purposes and as actuators for active vibration cancellation, thereby reducing the need for entirely separate dedicated components
3Object-generated harmful factors
If additional actuators are used to cancel vibrations on other surfaces, then sound leakage is reduced, but device complexity and space requirements increase
Solution Approach 1:
The patent merges the sound cancellation function with existing device structures by integrating vibration cancellation actuators into already-present components such as the back cover or side surfaces. This approach allows multiple surfaces to participate in both normal structural functions and active vibration cancellation, eliminating the need for separate dedicated cancellation components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances audio quality by providing accurate feedback for display-based sound emission, effectively cancels echoes, and reduces sound leakage from other surfaces, thereby optimizing the use of display-based audio systems in electronic devices.
Implementation Method 1
an actuator physically coupled to the display and configured to cause vibration of the display in response to an audio signal
Implementation Method 2
a vibration sensor physically coupled to the display and configured to sense the vibration of the display due to the actuator and to output a vibration sensor signal proportional to the vibration of the display
Implementation Method 3
the processor is configured to generate an echo reference signal based on the vibration sensor signal. The echo reference signal corresponds to a representation of an acoustic output of the display due to the vibration of the display
Implementation Method 4
the processor is configured to cancel at least part of an echo signal included within a microphone input signal received by a microphone where the processor is configured to cancel the at least part of the echo signal based on the echo reference signal
Data Source
AI summary
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.