Active Sound Leakage Cancellation via Phase-Inverted Anti-Noise
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Solution Overview
Problem
Existing terminal devices fail to completely eliminate sound leakage during calls due to poor sound insulation, leading to potential exposure of call content to others.
Innovation Solution
A method and apparatus that utilize a speaker to actively generate a sound wave with a phase opposite to the call sound leakage, modulating its frequency response to cancel out the leakage sound wave, ensuring effective elimination of sound leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a hardware structure is used to improve isolation degree by changing receiver position or narrow slit shape, then the isolation degree is improved, but the sound leakage cannot be completely eliminated
Solution Approach 1:
The patent applies preliminary anti-action by generating an anti-noise sound wave before the leakage sound wave reaches the external environment. The receiver emits a sound wave with opposite phase to the expected leakage sound, proactively canceling it out before it can propagate externally, thus preventing sound leakage rather than merely reducing it passively through structural modifications
Solution Approach 2:
The patent converts the harmful leakage sound into a beneficial cancellation effect by using the same sound wave that would leak as the basis for generating an anti-phase cancellation wave. The leakage sound's frequency and amplitude characteristics are utilized to create the counter-phase sound wave, transforming the harmful acoustic energy into a useful privacy protection mechanism
2Loss of information
If the isolation degree is improved through hardware structure changes, then call privacy is protected, but the sound insulation effect remains poor
Solution Approach 1:
The patent replaces the mechanical sound insulation system (physical barriers, structural modifications) with an acoustic field-based active cancellation system. Instead of relying on mechanical structures to block sound waves, the system uses generated sound waves to interfere destructively with leakage sounds, substituting a mechanical approach with a wave-based physical phenomenon approach
Solution Approach 2:
The patent changes the phase parameter of the sound wave by 180 degrees to create the anti-phase cancellation wave. By modifying the phase characteristic of the sound wave while maintaining similar amplitude and frequency characteristics, the system achieves sound cancellation through parameter transformation rather than through structural modifications
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
The solution effectively reduces and eliminates sound leakage by generating a counter-phase sound wave that superimposes and cancels the leakage sound wave, enhancing call privacy.
Implementation Method 1
frequency response of the third frequency response curve being superimposed on and canceling frequency response of the first frequency response curve at a corresponding frequency
Data Source
AI summary
A method for eliminating sound leakage includes: controlling, upon detecting call voice being outputted by a receiver, a collection device to determine a first frequency response curve of first sound wave of the call voice at a first position outside a terminal device; controlling a speaker to generate a second sound wave; controlling the collection device to determine a second frequency response curve of the second sound wave at the first position; and regulating, according to the first frequency response curve, the second frequency response curve to a third frequency response curve. Frequency responses of the first and third frequency response curves at a corresponding frequency are superimposed on and cancel each other. The speaker actively generates second sound wave that is modulated according to a parameter of first sound wave, so as to ensure that second sound wave effectively eliminates leakage of call content caused by first sound wave.