Asymmetric Cellular Acoustic Diffuser for Sound Scattering
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Solution Overview
Problem
Current acoustic diffusers in small spaces, such as home theaters and recording studios, suffer from poor diffusion characteristics, leading to sound aberrations like echoes due to equal cavity lengths causing increased absorption and reduced scattering effectiveness.
Innovation Solution
An asymmetric cellular acoustic diffuser system with a planar panel featuring asymmetrically oriented cells in linear arrays, separated by dividers, which are configured to facilitate one-dimensional or two-dimensional diffusion, reducing absorption and enhancing scattering by decoupling acoustic energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If equal length cavities are used in acoustic diffusers, then the diffuser structure is simple and symmetric, but this causes increased absorption and reduced scattering effectiveness due to sympathetic absorptive plane
Solution Approach 1:
The patent applies asymmetry by using cavities of different lengths arranged in a specific sequence. This breaks the symmetric structure that causes sympathetic absorption, thereby reducing energy loss while maintaining manufacturing feasibility through standardized cavity formation processes.
Solution Approach 2:
The patent implements local quality by varying the cavity lengths at different positions along the diffuser surface. Each cavity has a specific length tailored to its position, creating localized acoustic characteristics that prevent uniform sympathetic absorption while maintaining overall structural coherence.
2Ease of manufacture
If equal length cavities are used in acoustic diffusers, then the manufacturing process is simplified, but scattering effectiveness is reduced due to coupling of equal cavity lengths
Solution Approach 1:
The patent uses asymmetric cavity length sequencing to maintain manufacturing simplicity while eliminating the coupling effect that reduces scattering effectiveness. The asymmetric arrangement ensures that no two adjacent cavities have equal lengths, preventing resonance coupling.
Solution Approach 2:
The patent changes the cavity length parameter along the diffuser surface according to a specific sequence (e.g., quadratic residue sequence). This parameter variation maintains manufacturability through systematic design while significantly improving scattering effectiveness by preventing cavity coupling.
3Reliability
If traditional acoustic diffusers are used in small spaces, then the diffusion characteristics are poor, but adding more diffusion elements increases device complexity
Solution Approach 1:
The patent segments the diffuser surface into multiple zones with different cavity length sequences. This segmentation allows optimized diffusion characteristics for small spaces without requiring excessive overall size or complexity, as each segment contributes independently to the diffusion effect.
Solution Approach 2:
The patent applies local quality by tailoring cavity characteristics to specific regions of the diffuser. This allows enhanced diffusion performance in small spaces through localized optimization rather than requiring complex overall structure, improving reliability without proportionally increasing device complexity.
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 asymmetric cellular diffuser improves sound wave diffusion, reducing echoes and enhancing sound quality by minimizing absorption and increasing scattering, thereby improving the acoustic environment's diffusive characteristics.
Implementation Method 1
an acoustic diffuser will cause sound energy to be reflected in several directions, as opposed to a single direction corresponding roughly to the angle of incidence
Implementation Method 2
the performance of current devices... is limited... such devices have equal length cavities across their proximal surface which results in a sympathetic absorptive plane caused by the coupling of the equal cavity lengths
Implementation Method 3
The sympathetic absorptive plane results in increased absorption due to the presence of the equal cavity lengths that affects both the quality and quantity of diffusion
Data Source
AI summary
The present invention relates to providing an acoustic diffuser. In particular, the present invention relates to systems and methods for providing an asymmetric cellular acoustic diffuser adapted to diffuse sound waves that encounter a surface. Further, the present invention relates to providing a system of asymmetric cellular acoustic diffusers adapted to diffuse sound waves that encounter one or more surfaces in an acoustic environment. In some embodiments, an acoustic diffusion device as contemplated herein includes a planer panel having a first portion and a second portion, the first portion and the second portion each having a plurality of cells formed asymmetrically thereon. In such embodiments, the plurality of cells of the first portion is symmetrically oriented in relation to the plurality of cells of the second portion.