Non-Coplanar Speaker Module for Far-Field Sound Leakage Reduction
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Solution Overview
Problem
Existing electronic devices with sound systems experience far-field sound leakage, leading to privacy issues and environmental noise pollution.
Innovation Solution
A speaker module comprising two speakers with non-coplanar diaphragms and sound cavities, where sound waves emitted by each speaker cancel out in the far-field to mitigate sound leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a conventional single speaker is used in open-field/far-field situations, then the sound system can provide adequate sound output, but sound leakage occurs causing privacy issues and noise pollution
Solution Approach 1:
The sound system is divided into multiple independent speakers (first speaker with first diaphragm, second speaker with second diaphragm) positioned at different locations. Each speaker generates sound waves that independently contribute to the overall acoustic field, enabling spatial distribution of sound sources to achieve far-field muffling through interference effects
Solution Approach 2:
The first diaphragm and second diaphragm are positioned non-coplanarly (not on the same plane), creating asymmetric spatial arrangement. This asymmetric positioning ensures that sound waves from different speakers reach far-field points with different path lengths and phases, facilitating destructive interference to reduce sound leakage
Solution Approach 3:
The patent converts the harmful effect of sound wave propagation (which causes sound leakage) into a beneficial effect by utilizing wave interference principles. By carefully positioning multiple speakers, the sound waves interfere destructively in far-field directions, transforming the potential harm of sound spreading into a mechanism for sound suppression and privacy protection
2Reliability
If multiple speakers are added to reduce sound leakage, then privacy protection improves, but device complexity increases
Solution Approach 1:
Multiple speakers (first speaker, second speaker) are merged into a single integrated speaker module. The module combines multiple diaphragms, sound cavities, and acoustic channels into one unified structure, reducing the number of separate components and simplifying installation while maintaining the privacy protection function
Solution Approach 2:
The speaker module employs a nested structure where sound cavities are positioned within or adjacent to speaker assemblies, and acoustic channels are integrated within the module housing. This nesting arrangement maximizes space utilization and reduces overall device complexity by eliminating the need for separate enclosed spaces for each acoustic component
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
Effectively reduces sound leakage by up to 40 dB in the far-field, ensuring privacy and reducing environmental noise.
Implementation Method 1
sound waves emitted by each speaker cancel out in the far-field to mitigate sound leakage
Implementation Method 2
sound waves emitted from the second sound emission hole and the sound waves emitted from the external sound leakage hole are respectively superimposed with the sound waves emitted from the first sound emission hole
Data Source
AI summary
A speaker module and a head-mounted device are disclosed. The speaker module includes a bracket, a first speaker fixedly provided on a first surface of the bracket and a second speaker fixedly provided on a second surface of the bracket, and the first surface and the second surface are non-coplanar. The first speaker has a first diaphragm with a first rear sound cavity on one side thereof proximate to the bracket, and the first speaker has a first sound leakage hole in communication with the first rear sound cavity, and a centerline of the first sound leakage hole is parallel to the first surface of the bracket. The second speaker has a second diaphragm with a second rear sound cavity on one side thereof proximate to the bracket.