Smooth-Surface Waveguide for Even Off-Axis Frequency Response
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Solution Overview
Problem
Conventional loudspeakers exhibit sharp transitions and seams in their acoustic waveguides, leading to 'hot spots' and uneven frequency responses at off-axis listening positions, which cannot be effectively addressed through digital signal processing.
Innovation Solution
A waveguide design featuring smooth surfaces, ridges, and recesses that connect seamlessly, providing a continuous transition to control sound directivity and achieve a monotonous, smooth off-axis frequency response by shaping sound waves to disperse them evenly across a wider area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional waveguides with sharp transitions and seams are used, then manufacturing is simpler, but off-axis frequency response becomes uneven with hot spots
Solution Approach 1:
The waveguide employs curved surfaces with continuous transitions instead of sharp edges and seams. The smooth curved geometry eliminates discontinuities that cause diffraction and hot spots, creating a monotonous off-axis frequency response while maintaining manufacturability through standardized curved profiles.
Solution Approach 2:
The waveguide cross-sectional dimensions and shape parameters are continuously varied along its length to optimize sound wave propagation. By adjusting geometric parameters such as width, height, and curvature radius, the design achieves smooth off-axis frequency response while controlling manufacturing complexity.
2Manufacturing precision
If smooth continuous surfaces are used in the waveguide, then off-axis frequency response becomes smooth without hot spots, but manufacturing precision requirements increase
Solution Approach 1:
The waveguide utilizes continuous curved surfaces that eliminate sharp transitions and seams, directly addressing the frequency response uniformity requirement. The curved geometry is designed with practical manufacturing considerations, using standard curvature profiles that can be fabricated with conventional precision manufacturing techniques.
Solution Approach 2:
The waveguide geometry employs controlled parameter variations along its length, where cross-sectional dimensions and curvature radii are optimized to achieve smooth acoustic performance. These parameter changes are designed within manufacturable ranges, balancing frequency response uniformity with fabrication ease.
3Speed
If the waveguide focuses high frequency sound waves to a narrow beam, then on-axis sound projection is improved, but off-axis frequency response becomes uneven
Solution Approach 1:
The waveguide employs curved surfaces that gradually redirect sound waves, creating a balanced dispersion pattern. The continuous curvature profiles control the transition from on-axis focusing to off-axis distribution, achieving both directional projection and smooth frequency response without sharp transitions that would create hot spots.
Solution Approach 2:
The waveguide geometry is optimized with varying cross-sectional parameters along its length to control sound wave directionality. By adjusting width, height, and curvature parameters, the design achieves effective on-axis projection while maintaining smooth off-axis frequency response through controlled sound wave dispersion.
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 waveguide ensures a consistent and pleasing sound experience across different listening positions by minimizing frequency variations and eliminating hot spots, maintaining a smooth timbre change as listeners move around.
Implementation Method 1
Acoustic waveguide is provided for beamwidth control and smooth off-axis frequency response for high frequency sound waves
Implementation Method 2
The waveguide shapes propagation of the sound waves to provide a smooth off-axis frequency response for the sound waves
Data Source
Figure 1~2
Figure 3A~3B
Figure 3C~3E
AI summary
One embodiment provides a waveguide for controlling sound directivity of high frequency sound waves generated by a speaker driver. The waveguide is positioned in front of the speaker driver. The waveguide comprises one or more ridge areas, one or more recess areas, and one or more smooth surfaces. Each smooth surface connects a ridge area to a recess area to create a smooth transition between the ridge area and the recess area without any seams or sharp transitions. The waveguide shapes propagation of the sound waves to provide a smooth off-axis frequency response for the sound waves.