Semi-Solid Audio Cable Air Void Design
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Solution Overview
Problem
Audio cables face signal velocity impairments due to dielectric material effects, leading to phase distortion and 'smearing' of audio signals, as the propagation velocity varies significantly across the audible frequency range, and existing solutions like polyethylene foam do not maximize signal velocity effectively.
Innovation Solution
The use of narrow gauge conductors with a non-conductive thread or bead to reduce dielectric material surrounding the conductor, creating an air void that maximizes signal velocity by minimizing dielectric effects, while maintaining structural support and positioning through spiraling wrapping, thereby ensuring both low and high-frequency signals travel through the entire conductor depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyethylene foam dielectric material is used to support the conductor, then structural support and positioning are maintained, but signal propagation velocity is reduced due to dielectric effects
Solution Approach 1:
The patent uses air (a porous/void material) instead of solid polyethylene foam as the dielectric surrounding the conductor. By eliminating the solid dielectric material and replacing it with air voids, the patent reduces dielectric effects while maintaining structural support through the conductor's own rigidity and the jacket's containment, thereby maximizing signal propagation velocity.
2Reliability
If narrow gauge conductors are used, then skin effect is reduced and high frequency signals utilize full conductor depth, but conductor strength and flexibility are reduced
Solution Approach 1:
The patent employs composite construction by combining multiple narrow gauge conductors (strands) twisted together to form the center conductor. This composite structure maintains the electrical benefits of narrow gauge conductors (reduced skin effect) while providing mechanical strength and flexibility through the multi-strand construction, allowing the cable to be both electrically optimal and mechanically robust.
3Speed
If air void is maximized around the conductor, then propagation velocity is maximized, but cable structural integrity and shielding effectiveness are reduced
Solution Approach 1:
The patent applies local quality by creating an air void specifically in the region immediately surrounding the center conductor where the magnetic field is strongest, thereby maximizing propagation velocity where it matters most. The outer conductor and jacket maintain structural integrity and shielding effectiveness by providing mechanical support and electromagnetic shielding at the cable's periphery, where structural strength is needed rather than signal velocity enhancement.
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 approach results in high propagation velocity across the audible band with reduced self-inductance and capacitance, minimizing audible phase distortion and 'smearing', achieving nearly 100% theoretical maximum velocity and low noise interference.
Implementation Method 1
Dielectric material around a conductor will affect the propagation velocity of signals in the conductor. Specifically, the velocity factor VF or ratio of the velocity of the signal in the conductor to the velocity of a signal in vacuum (i.e. the speed of light, c) is the reciprocal of the square root of the dielectric constant of the material
Implementation Method 2
narrow gauge conductors may be used to reduce skin effect by ensuring that high frequency signals utilize the full depth of the conductor
Implementation Method 3
the amount of non-air dielectric material surrounding a conductor may be reduced while still maintaining position and structural support by spirally wrapping the conductor with a non-conductive thread or bead of material
Data Source
AI summary
Implementations of audio cables including a conductor spirally wrapped in a non-conductive thread to centrally position the conductor within a channel comprising mostly air include a first conductor having a first diameter, and a non-conductive thread spirally wrapped around the center conductor, the non-conductive thread having a second diameter. A first jacket surrounds the center conductor and thread, having an inner diameter approximately equal to the first diameter plus twice the second diameter. A second conductor surrounds the first jacket and/or the center conductor and thread. In many implementations, the first diameter is less than the second diameter.