Omni-directional Speaker Deflector with Absorbing Chamber
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Solution Overview
Problem
Conventional acoustic deflectors in speaker systems exhibit artifacts in the acoustic spectrum due to acoustic modes present between the acoustic driver and the acoustic deflector, which affect the resonant response of omni-directional speaker systems.
Innovation Solution
The implementation of a deflector sub-assembly with a pair of diametrically opposed omni-directional acoustic deflectors, each with a truncated conical shape and acoustically absorbing material, forms a shared acoustic chamber that attenuates specific acoustic modes, and recesses on the deflectors' surfaces further refine the acoustic spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional acoustic deflector is used in a speaker system, then the speaker system can redirect acoustic energy, but acoustic modes are present between the acoustic driver and the acoustic deflector causing artifacts in the acoustic spectrum
Solution Approach 1:
The acoustic deflector is divided into multiple segments or zones with different acoustic properties. The deflector includes a first portion and a second portion that can be independently configured to manage different acoustic modes, allowing the system to redirect acoustic energy while suppressing artifacts through segmented acoustic control
Solution Approach 2:
Different portions of the acoustic deflector are assigned different local acoustic characteristics. The first portion may have one acoustic impedance or geometric configuration while the second portion has different properties, allowing localized suppression of specific acoustic modes while maintaining overall acoustic energy redirection functionality
2Reliability
If acoustic modes are present between the acoustic driver and the acoustic deflector, then the acoustic energy can be transmitted, but resonant artifacts appear in the acoustic spectrum affecting sound quality
Solution Approach 1:
An intermediate acoustic structure or material is introduced between the acoustic driver and the acoustic deflector to mediate the acoustic energy transmission. This intermediary element filters or transforms the acoustic waves to prevent resonant artifacts while maintaining efficient energy transmission from the driver to the deflector
Solution Approach 2:
The acoustic properties of the deflector or the space between the driver and deflector are modified by changing physical parameters such as acoustic impedance, geometric dimensions, or material properties. These parameter changes are designed to suppress resonant frequencies and eliminate artifacts in the acoustic spectrum while preserving acoustic energy 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 the acoustic spectrum by eliminating resonant artifacts, providing a more uniform sound distribution and maintaining high-frequency coverage without directional orientation requirements, suitable for mobile speaker systems.
Implementation Method 1
The pair of diametrically opposed acoustic deflectors form a shared acoustic chamber that attenuates specific acoustic modes
Implementation Method 2
Each of the acoustic sub-assemblies includes an acoustic driver for radiating acoustic energy toward an associated one of the acoustic deflectors
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
An omni-directional speaker system (100) includes a deflector subassembly (104) and a pair of acoustic sub-assemblies (102a, 102b). The deflector sub-assembly (104) includes a pair of diametrically opposed acoustic deflectors (114a, 114b). Each of the acoustic subassemblies (102a, 102b) includes an acoustic driver (108a, 108b) for radiating acoustic energy toward an associated one of the acoustic deflectors (104). The acoustic sub-assemblies are coupled together via the deflector sub-assembly.