Bone Conduction Speaker Sound Leakage Suppression
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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 sound leakage without increasing the device's volume or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a dual magnetic structure and double-frame are used to reduce sound leakage, then sound leakage is reduced to some extent, but the volume and weight of the speaker increase
Solution Approach 1:
The patent extracts the sound leakage reduction function from a complex dual magnetic structure and double-frame system, isolating the essential acoustic interference mechanism. By removing unnecessary structural elements (extra frames and magnetic components), the solution achieves sound leakage reduction without the associated weight and volume penalties.
Solution Approach 2:
The patent converts the harmful sound leakage waves into beneficial acoustic interference by introducing a controlled sound outlet that generates counter-phase sound waves. The previously harmful leaked sound is transformed into a useful tool for canceling other leakage through acoustic interference, achieving noise reduction without adding structural weight.
2Object-generated harmful factors
If a dual magnetic structure and double-frame are used to reduce sound leakage, then sound leakage is reduced to some extent, but the cost increases
Solution Approach 1:
The patent extracts only the essential sound outlet component needed for acoustic interference, removing the need for expensive dual magnetic structures and double-frames. This simplification dramatically reduces manufacturing costs while maintaining the sound leakage reduction function.
Solution Approach 2:
The patent replaces expensive, complex magnetic and structural components with a simple, inexpensive sound outlet structure. The simplified design uses minimal materials and assembly steps, making the solution cost-effective and easy to manufacture at scale.
3Power
If the housing vibrates to push air and generate sound, then sound is produced, but sound leakage occurs compromising privacy and disturbing others
Solution Approach 1:
The patent converts the harmful sound leakage generated by housing vibration into a beneficial acoustic interference mechanism. The sound outlet introduces counter-phase waves that cancel the leakage, transforming the problem of sound production causing leakage into a solution where the same vibration mechanism creates both the desired sound and its own cancellation.
Solution Approach 2:
The sound outlet acts as an intermediary element between the vibrating housing and the external environment. It mediates the acoustic energy by introducing counter-phase sound waves that interfere with and cancel the leakage, allowing the housing to vibrate for sound production without the harmful side effect of uncontrolled leakage.
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 preventing unwanted noise dispersion.
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
a portion of the vibrating board 121 and the housing 110 that are not in contact with human issues may nevertheless push air. Air sound may thus be generated by the air pushed by the portion of the vibrating board 121 and the housing 110
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.