Spiral Waveguide Speaker for Compact Low-Frequency Output
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Solution Overview
Problem
Traditional subwoofers require large and heavy designs to achieve high-quality low-frequency sound, making them bulky and impractical for portable use.
Innovation Solution
A compact speaker system incorporating a low-frequency spiral waveguide that redirects sound waves without abrupt changes in direction, reducing cabinet volume and using thinner materials while maintaining superior sonic characteristics and minimizing group delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional subwoofer designs are used to achieve high-quality low-frequency sound, then sound quality is improved, but the speaker system becomes large and heavy
Solution Approach 1:
The patent employs a spiral waveguide configuration where the acoustic path follows a curved spiral trajectory rather than straight lines. This curvature allows the sound waves to navigate through the enclosure efficiently, achieving long acoustic paths in compact spaces while maintaining low-frequency response quality without requiring large traditional subwoofer cabinets
Solution Approach 2:
The spiral waveguide utilizes three-dimensional spatial arrangement by winding the acoustic path through multiple levels and dimensions within the enclosure. This transforms a potentially linear space-consuming design into a compact volumetric solution, allowing the acoustic signal to traverse a long path through vertical and radial dimensions rather than only horizontal space
2Reliability
If traditional subwoofer designs are used to achieve high-quality low-frequency sound, then sound quality is improved, but the speaker system becomes large in size
Solution Approach 1:
The spiral waveguide configuration uses curved paths to maximize the acoustic travel distance within a minimal enclosure volume. The spiral geometry allows sound waves to follow an extended trajectory through the cabinet, achieving effective low-frequency radiation without requiring the large linear space needed by traditional designs
Solution Approach 2:
The waveguide structure is nested within the speaker enclosure, with the spiral path contained entirely within the cabinet boundaries. This nested arrangement allows the acoustic path to be embedded within the existing structural volume, achieving long acoustic paths without increasing the external dimensions of the speaker system
3Productivity
If folded line waveguides with abrupt direction changes are used, then the acoustic path is redirected, but turbulence is created reducing sound quality
Solution Approach 1:
The spiral waveguide replaces abrupt angular folds with smooth continuous curves. The gradual curvature transitions guide the sound waves through the enclosure without sudden direction changes, eliminating turbulence and maintaining laminar flow throughout the acoustic path, thereby preserving sound quality while achieving effective path redirection
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 spiral waveguide design achieves efficient low-frequency output with reduced cone motion and resonance, allowing for a lightweight, compact speaker system that maintains high sound quality and extends low-frequency output.
Implementation Method 1
The spiral waveguide provides a constant redirecting of the soundwave without abrupt changes in direction... The spiral waveguide therefore provides a line with a much longer effective acoustic length and minimum pressure attenuation
Implementation Method 2
the damaging effects of infrasonic cone motion are minimized due to the flow-resistive nature of the spiral in comparison to a typically straight port tube
Implementation Method 3
The low-frequency terminus exit port may be flared to provide a smooth transition from high pressure sound waves to a listening room at a dissimilar acoustic impedance
Implementation Method 4
fibrous damping material may be located in the enclosure to provide acoustic viscosity which helps control infrasonic cone motion
Data Source
AI summary
A low-frequency loudspeaker is provided comprising an enclosure having a front, a back and a sidewall. An audio speaker is mounted in an opening in the front of the enclosure. The audio speaker has a diaphragm for producing front sound waves that are transmitted outwardly from the diaphragm and back sound waves that are transmitted into the enclosure from the diaphragm. A spiral waveguide is positioned within the enclosure. The spiral waveguide has a first end proximal to the speaker diaphragm for receiving the back sound waves and extends outwardly therefrom in a spiral pattern to a second end that forms a low-frequency terminus exit port opening in the sidewall.