Head-Mounted Sound Leakage Reduction via Acoustic Dipole
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Solution Overview
Problem
Intelligent head-mounted apparatuses with open-type sound coupling suffer from significant sound leakage, compromising personal privacy and potentially interfering with others, while also reducing the sound received by the wearer, especially in the low-frequency band.
Innovation Solution
The intelligent head-mounted apparatus is designed with a sound generation device that divides the cavity into a front sound cavity and a rear sound cavity, with a sound outlet hole located at the front side of the auricle and a main sound leakage hole positioned at the rear side. The positions of these holes are configured to create an acoustic dipole effect for far-field sound leakage reduction, while ensuring the wearer receives sound with appropriate loudness in the near-field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an open-type coupling mode is used between the sound generation device and the human ear, then the comfort and ability to sense external dynamics are improved, but sound leakage increases
Solution Approach 1:
The cavity is divided into a front sound cavity and a rear sound cavity, with separate sound outlet holes and sound leakage holes positioned at different locations to independently control sound delivery and leakage reduction
Solution Approach 2:
The sound leakage hole is positioned in the vertical direction above the sound outlet hole, creating a spatial separation that enables acoustic dipole effect for far-field sound leakage reduction while maintaining near-field sound delivery
2Object-generated harmful factors
If a sound leakage hole is provided on the rear sound cavity to reduce far-field sound leakage, then sound leakage is reduced, but the sound received by the wearer is also reduced due to acoustic short circuit
Solution Approach 1:
Different regions of the cavity are given different functions: the front sound cavity with sound outlet hole for primary sound delivery to the wearer, and the rear sound cavity with sound leakage hole for controlled sound release to reduce far-field leakage, minimizing acoustic short circuit between the two regions
Solution Approach 2:
The sound leakage hole is positioned in the vertical direction above the sound outlet hole rather than adjacent to it, creating sufficient spatial separation to prevent acoustic short circuit while maintaining the acoustic dipole effect for far-field 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
This design effectively reduces sound leakage in the far-field by creating an acoustic dipole effect, while maintaining adequate sound loudness for the wearer in the near-field, thereby improving low-frequency sensitivity and overall sound quality.
Implementation Method 1
both of them form an acoustic dipole effect at a far-field position, thereby reducing the sound leakage at the far-field
Data Source
AI summary
Disclosed is an intelligent head-mounted apparatus, comprising: a lens; a leg coupled to the lens and provided with a cavity therein; a sound generation device provided in the cavity and dividing the cavity into a front sound cavity and a rear sound cavity; a sound outlet hole provided on the leg and in communication with the front sound cavity; and a main sound leakage hole provided on the leg and in communication with the rear sound cavity, wherein positions of the sound outlet hole and the main sound leakage hole are configured such that the sound outlet hole is located at a front side of an auricle of a wearer, and the main sound leakage hole is located at a rear side of the auricle of the wearer when the wearer wears the intelligent head-mounted apparatus.