Bone Conduction Speaker Sound Leakage Reduction via Guided Interference
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Solution Overview
Problem
Bone conduction speakers experience sound leakage due to vibrations causing air displacement, which can compromise privacy and disturb others, and existing solutions like dual magnetic structures are inefficient in reducing leakage while increasing weight and cost.
Innovation Solution
Incorporating sound guiding holes in the housing of the bone conduction speaker to guide sound waves inside the device outwards, where they interfere with leaked sound waves, reducing their amplitude and minimizing leakage without increasing the device's volume or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If sound guiding holes are added to guide sound waves outwards for interference, then sound leakage is reduced, but device complexity increases
Solution Approach 1:
The housing is segmented by introducing sound guiding holes that create separate acoustic pathways. These holes divide the internal sound field into controlled channels that guide sound waves to specific exit points, enabling interference patterns that reduce sound leakage while maintaining structural integrity.
Solution Approach 2:
The sound guiding holes act as intermediary elements between the internal sound field and external environment. By controlling the phase and amplitude of sound waves passing through these holes, the system creates destructive interference with leaked sound waves, thereby reducing harmful sound leakage without requiring complete sealing.
2Object-generated harmful factors
If dual magnetic structure is used to reduce sound leakage, then sound leakage is reduced, but weight and cost increase
Solution Approach 1:
The invention extracts the sound leakage control function from the magnetic structure and relocates it to the housing geometry through sound guiding holes. This separates the vibration generation function (magnetic structure) from the sound leakage control function (housing with holes), allowing lightweight housing materials to be used while achieving effective leakage reduction.
Solution Approach 2:
The mechanical dual magnetic structure approach is replaced with an acoustic field approach using sound guiding holes. Instead of using additional magnetic components to control sound leakage, the system uses acoustic wave guidance and interference principles, eliminating the need for heavy magnetic assemblies while achieving the same leakage reduction effect.
3Object-generated harmful factors
If dual magnetic structure is used to reduce sound leakage, then sound leakage is reduced, but manufacturing cost increases
Solution Approach 1:
The invention replaces expensive magnetic components with simple housing geometry modifications. The sound guiding holes can be manufactured using standard molding or machining techniques, making the solution cost-effective and suitable for mass production without requiring specialized magnetic assembly processes.
Solution Approach 2:
The housing structure is designed to perform multiple functions: protecting internal components, defining acoustic chambers, and guiding sound waves through strategically positioned holes. This multi-functionality eliminates the need for separate magnetic leakage control components, reducing overall manufacturing cost while achieving effective sound leakage reduction.
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 sound leakage by up to 20 dB in specific frequency ranges, maintaining the speaker's reliability and cost-effectiveness while improving user privacy and reducing disturbance to others.
Implementation Method 1
the air inside the housing is pushed out of the housing through the at least one sound guiding hole, interferes with the leaked sound wave, and reduces an amplitude of the leaked sound wave
Implementation Method 2
The transducer 122 may transduce electrical signals to mechanical vibrations
Implementation Method 3
The vibration board 121 may stretch out from the opening of the housing 110 and contact with human skin to pass vibrations to auditory nerves through human tissues and bones
Data Source
AI summary
A speaker comprises a housing, a transducer residing inside the housing, and at least one sound guiding hole located on the housing. The transducer generates vibrations. The vibrations produce a sound wave inside the housing and cause a leaked sound wave spreading outside the housing from a portion of the housing. The at least one sound guiding hole guides the sound wave inside the housing through the at least one sound guiding hole to an outside of the housing. The guided sound wave interferes with the leaked sound wave in a target region. The interference at a specific frequency relates to a distance between the at least one sound guiding hole and the portion of the housing.