Display Speaker Feedback Control for Echo and Sound Leakage
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Solution Overview
Problem
Electronic devices face challenges in providing high-quality audio output without occupying space, particularly 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 cancel echo signals, while also 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 replace traditional speakers, then the display area can be maximized and space occupied by audio components is reduced, but echo issues and sound leakage occur 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, comparing them with desired characteristics, and adjusting the actuator input signals to minimize differences. This closed-loop system addresses echo and sound leakage by continuously optimizing the display's vibration behavior based on real-time measurements.
Solution Approach 2:
The patent applies preliminary anti-action by using active noise cancellation techniques where anti-phase vibration signals are generated in advance to counteract expected echo and sound leakage from the display. The system predicts harmful vibrations and applies opposing forces before the harmful effects fully manifest.
2Reliability
If vibration sensors and feedback control systems 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 multi-functionality by designing the vibration sensor system to serve multiple purposes: characterizing display vibration properties for audio enhancement, detecting echo conditions for cancellation, and monitoring overall display behavior. This single sensor system performs what would traditionally require multiple separate subsystems.
Solution Approach 2:
The system implements self-service by using the display itself as both the sound emitter and the vibration sensing element. The display's inherent structural characteristics provide the feedback needed for control, eliminating the need for entirely separate characterization systems and reducing overall device complexity.
3Object-generated harmful factors
If additional actuators are added to cancel vibrations on other surfaces, then sound leakage is minimized, but device complexity and space usage increase
Solution Approach 1:
The patent merges functions by integrating multiple vibration control objectives into a unified feedback control system. The same actuator that drives the display for audio output is also used to cancel vibrations on coupled surfaces, eliminating the need for separate actuators and reducing system complexity.
Solution Approach 2:
The patent applies segmentation by dividing the vibration control into frequency-dependent zones, where different actuator strategies are applied to different frequency ranges and surface areas. This allows targeted cancellation of sound leakage from specific surfaces without requiring actuators on every surface.
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 solution enhances audio quality by providing accurate feedback and echo cancellation, allowing for better sound emission from the display while minimizing sound leakage from other surfaces, thus optimizing space usage in electronic devices.
Implementation Method 1
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 2
an actuator physically coupled to the display and configured to cause vibration of the display in response to an audio signal that is an input to the actuator
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
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. In particular a vibration sensor such as an accelerometer is physically coupled to the display and senses display vibration to provide a high accuracy feedback loop with respect to representing actual audio output from the display. The electronic device includes an actuator physically coupled to the display and configured to cause vibration of the display in response to an audio signal. The electronic device further includes 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 actuator. The electronic device further includes a processor operably coupled to the vibration sensor. The processor is configured to adjust the audio signal based on the vibration sensor signal from the vibration sensor.