Speaker Module Baffle Walls Reduce Helmholtz Resonance
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Solution Overview
Problem
Large rear acoustic cavities in speaker modules can lead to significant Helmholtz resonance when combined with small sounding holes, negatively impacting sound performance.
Innovation Solution
The speaker module incorporates baffle walls within the rear acoustic cavity to divide it into multiple cavities, with slits for communication between adjacent cavities, increasing acoustic resistance and reducing Helmholtz resonance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rear acoustic cavity is made large in volume to improve low frequency performance, then low frequency sound quality is improved, but Helmholtz resonance occurs when combined with a small sounding hole, degrading overall acoustic performance
Solution Approach 1:
The rear acoustic cavity is divided into multiple separate cavities using baffle walls with slits. This segmentation transforms the single large cavity into multiple smaller cavities that communicate through controlled slit openings, increasing acoustic resistance and suppressing Helmholtz resonance while preserving low frequency performance
Solution Approach 2:
Baffle walls with slits are introduced as intermediary structures between the speaker unit and the rear acoustic cavity. These baffle walls create controlled communication paths through the slits, acting as mediators that increase acoustic resistance and reduce Helmholtz resonance effects while allowing sound transmission
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 configuration enhances acoustic performance by minimizing the impact of Helmholtz resonance, improving sound quality and frequency response.
Implementation Method 1
When the rear acoustic cavity is relatively large but the sounding hole in the speaker unit is relatively small, a significant effect of Helmholtz resonance is generated which has a negative influence on the sounding performance of the product
Data Source
AI summary
A speaker module includes a casing and a speaker unit housed and fixed in the casing, a rear acoustic cavity being formed between the casing and the speaker unit, wherein at least one baffle wall is provided on the casing in the rear acoustic cavity and divides the rear acoustic cavity into at least two cavities, and wherein at least one slit is formed between the baffle walls or on the baffle wall, so that sound generated by the speaker unit can spread to an adjacent cavity inside the rear acoustic cavity through the slit.