Smart Head-Mounted Acoustic Dipole for Sound Leakage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The open-coupling design of smart head-mounted devices leads to significant sound leakage, compromising personal privacy and disturbing others, which existing technologies have not adequately addressed.
Innovation Solution
The device incorporates a sound production apparatus within a cavity that divides into front and back acoustic cavities, with a sound outlet communicating with the front cavity and a main sound leakage hole communicating with the back cavity, creating an acoustic dipole effect to cancel sound leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sound production apparatus is open-coupled to the human ear, then the wearing comfort and environmental perception are improved, but the sound leakage increases significantly
Solution Approach 1:
The cavity is divided into a front acoustic cavity and a back acoustic cavity by the sound production apparatus. The sound outlet is positioned on the front acoustic cavity while the main sound leakage hole is positioned on the back acoustic cavity, creating spatial separation of sound emission paths that enables the acoustic dipole effect to reduce overall sound leakage.
Solution Approach 2:
The main sound leakage hole is configured to generate sound waves that are opposite in phase to those from the sound outlet, creating an acoustic dipole effect. These opposing sound waves cancel each other at peripheral positions, effectively counteracting the harmful sound leakage while maintaining open-coupling comfort.
2Reliability
If the sound outlet is positioned closer to the ear hole, then the sound transmission to the wearer is improved, but the sound leakage to others increases
Solution Approach 1:
The back acoustic cavity and main sound leakage hole act as an intermediary system that generates counter-phase sound waves. This intermediary mechanism cancels the sound leakage from the front acoustic cavity at peripheral positions, allowing the sound outlet to be positioned optimally for the wearer without increasing external leakage.
3Adaptability or versatility
If the open-coupling design is used, then the real-time environmental perception is improved, but the personal privacy protection deteriorates
Solution Approach 1:
By segmenting the acoustic cavity into front and back portions with separately positioned sound outlet and main sound leakage hole, the system maintains open-coupling for environmental perception while the acoustic dipole effect selectively cancels sound leakage in external directions, preserving privacy.
Solution Approach 2:
The acoustic dipole effect generated by the main sound leakage hole creates counter-phase sound waves that cancel the sound leakage to peripheral areas, thereby protecting personal privacy while the open-coupling structure remains intact for environmental awareness.
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 design effectively reduces sound leakage by canceling sound waves at the peripheral position of the wearer, maintaining comfort and privacy while allowing real-time environmental perception.
Implementation Method 1
by providing the sound outlet at a position of the arm where it is in communication with the front acoustic cavity and providing the main sound leakage hole at a position where it is in communication with the back acoustic cavity of the sound production apparatus, it is possible to create an acoustic dipole effect since the sound outlet and the main sound leakage hole have opposite phases, such that the sounds emitted by the two sound sources are canceled each other at the peripheral position of the wearer
Data Source
AI summary
Disclosed is a smart head-mounted device, and the smart head-mounted device comprises at least one lens and at least one arm, the arm is connected to the lens and has a cavity therein; further comprises a sound production apparatus provided inside the cavity and dividing the cavity into a front acoustic cavity and a back acoustic cavity; a sound outlet and a main sound leakage hole provided on the arm, the sound outlet is in communication with the front acoustic cavity, and the main sound leakage hole is in communication with the back acoustic cavity.