Bone Conduction Speaker Sound Leakage Reduction via Acoustic 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 speaker'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 divide the internal acoustic space into distinct pathways. These holes create separate channels for sound wave propagation, allowing controlled interference patterns to reduce sound leakage while maintaining structural integrity.
Solution Approach 2:
Sound guiding holes act as intermediary structures that mediate between the internal vibration source and the external environment. By guiding sound waves through these controlled openings, the patent creates an intermediate acoustic pathway that enables interference-based leakage reduction without requiring complete sealing or complex active control systems.
2Object-generated harmful factors
If existing dual magnetic structure solutions are used to reduce sound leakage, then leakage is reduced, but weight and cost increase
Solution Approach 1:
The patent extracts the sound leakage reduction function from complex magnetic structures and implements it through simple geometric modifications to the housing. By taking out the need for additional magnetic components and using only the housing geometry itself to guide and interfere sound waves, the solution eliminates unnecessary weight while maintaining effectiveness.
Solution Approach 2:
The sound guiding holes utilize the existing housing material and geometry rather than requiring expensive, heavy magnetic components. This approach uses readily available structural elements in a creative way, achieving sound leakage reduction without increasing cost or weight.
3Object-generated harmful factors
If existing dual magnetic structure solutions are used to reduce sound leakage, then leakage is reduced, but device complexity and cost increase
Solution Approach 1:
The housing structure serves multiple functions: it provides mechanical support, encloses the transducer, and simultaneously guides sound waves through integrated sound guiding holes. This multi-functionality eliminates the need for separate magnetic structures, reducing both complexity and cost while maintaining sound leakage reduction effectiveness.
Solution Approach 2:
The patent merges the sound guidance function with the existing housing structure by incorporating sound guiding holes directly into the housing. This combining of functions eliminates the need for separate magnetic components and simplifies the overall device architecture while achieving the desired acoustic interference effect.
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.
Implementation Method 1
The transducer 122 may transduce electrical signals to mechanical vibrations
Implementation Method 2
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
Implementation Method 3
the housing 110 vibrates, along with the vibrations of the transducer, and pushes air, forming a leaked sound wave transmitted in the air
Implementation Method 4
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
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.