Portable Audio Waveguide Structure for Resonance Peak Reduction
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Solution Overview
Problem
Existing acoustic waveguides in audio systems face challenges in reducing resonance peaks and efficiently directing acoustic energy, particularly in portable audio systems where space and noise reduction are critical.
Innovation Solution
The design incorporates a waveguide with subsections that bend around different axes with varying cross-sectional areas, acoustically coupling them to reduce resonance and facilitate efficient energy transmission, while also featuring a textured surface and a docking cradle for ergonomic handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a waveguide is used to direct acoustic energy, then acoustic transmission efficiency is improved, but resonance peaks occur that degrade sound quality
Solution Approach 1:
The waveguide is divided into multiple subsections (first subsection, second subsection, third subsection) with different orientations and cross-sectional areas. This segmentation allows each section to serve specific acoustic functions while collectively reducing resonance peaks through distributed acoustic path variations.
Solution Approach 2:
Different subsections of the waveguide have different cross-sectional areas and orientations tailored to specific acoustic requirements. The first subsection has a first cross-sectional area, the second subsection has a second cross-sectional area, and the third subsection has a third cross-sectional area, creating local acoustic impedance variations that reduce resonance.
2Object-generated harmful factors
If the waveguide cross-sectional area is varied to reduce resonance, then resonance peaks are reduced, but acoustic energy transmission efficiency may be compromised
Solution Approach 1:
The waveguide transitions from static uniform cross-section to dynamic varying cross-section along its length. The third subsection specifically has a cross-sectional area that varies between the first and second cross-sectional areas, creating a gradual acoustic impedance transition that maintains energy transmission while reducing resonance.
Solution Approach 2:
The cross-sectional area parameter of the waveguide is deliberately changed along its length. The first cross-sectional area, second cross-sectional area, and third cross-sectional area are different parameters that are optimized to reduce resonance while maintaining acoustic transmission efficiency through controlled parameter variation.
3Shape
If the waveguide bends around multiple non-parallel axes, then acoustic directionality is improved, but manufacturing complexity increases
Solution Approach 1:
The complex three-dimensional waveguide path is segmented into discrete subsections, each bending around a specific axis (first axis, second axis, third axis). This segmentation simplifies manufacturing by allowing each section to be formed independently and then assembled, reducing the overall manufacturing complexity despite the complex final shape.
Solution Approach 2:
The waveguide subsections are designed to be assembled together in a nested or sequential manner, where the first subsection, second subsection, and third subsection are connected in series. This modular assembly approach simplifies manufacturing compared to forming the entire complex 3D path as a single monolithic structure.
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 acoustic energy transmission, reduces resonance peaks, and provides a user-friendly handling mechanism, improving the overall performance and usability of portable audio systems.
Implementation Method 1
acoustic waveguides have been used in audio systems
Implementation Method 2
A third subsection acoustically couples the first subsection to the second subsection. The third subsection includes a third cross-sectional area with an aspect ratio that varies between the first aspect ratio and the second aspect ratio
Data Source
AI summary
An audio system includes a housing and an acoustic opening that exits the housing, and has a configuration that facilitates the grasping of the housing with a plurality of fingers from a single human hand. The acoustic opening is located adjacent an exterior surface of the housing such that the shape of the exit together with the exterior surface facilitates grasping of the housing with a plurality of fingers and the thumb from the single human hand and the acoustic opening exits a back surface of the housing such that the plurality of fingers can be inserted into the exit while the thumb of the same hand can rest on at least one of the top surface and the front surface of the housing.