Direct-Radiating Earphone Drivers Eliminate Tube Resonance
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Solution Overview
Problem
Traditional personal listening devices, such as earphones, face challenges in sound fidelity due to tube resonance and constriction of sound waves caused by tubing or bores, which affect the frequency response and overall acoustic design.
Innovation Solution
The design incorporates multi-transducer in-ear monitors with both indirect-radiating and direct-radiating balanced armatures, where sound waves from direct-radiating drivers are emitted directly into a sealed airspace, and indirect-radiating drivers emit through holes or slots, eliminating the need for sound tubes and bores, and utilizing a front-vented driver configuration to tune frequency responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tube-based sound delivery is used, then the driver output can be directed to the ear canal, but tube resonance and sound wave constriction occur affecting frequency response and sound fidelity
Solution Approach 1:
The patent removes the sound tube or bore component from the system entirely. Instead of directing sound through a tube from the driver to the ear canal, the driver is positioned to radiate sound directly into the ear canal, eliminating the source of tube resonance and sound wave constriction while maintaining the sound delivery function
Solution Approach 2:
The patent introduces a sealed airspace as an intermediary medium between the driver and the ear canal. This sealed airspace allows sound waves to propagate without the constriction and resonance issues of traditional tubes, while still enabling effective sound delivery to the user
2Ease of operation
If tubing or bores are used to direct driver output, then sound can be delivered to the earpiece, but the acoustic design becomes complicated and overall fidelity deteriorates
Solution Approach 1:
The patent eliminates the complex tubing or bore structures from the acoustic path. By positioning the driver to radiate directly into the ear canal without intermediate conduits, the acoustic design is simplified while maintaining or improving sound fidelity
Solution Approach 2:
The patent changes the acoustic configuration from a constrained tube-based system to an open sealed airspace system. This parameter change in the acoustic path geometry eliminates the need for complex tube routing while preserving sound delivery effectiveness
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 improves sound reproduction fidelity by eliminating tube resonance and distortion, providing a more linear frequency response and enhanced sound quality without the drawbacks of traditional tube-based systems.
Implementation Method 1
at least one other audio transducer is a direct-radiating balanced armature that radiates its sound waves directly into a closed and substantially sealed airspace
Implementation Method 2
at least one audio transducer is an indirect-radiating balanced armature that delivers its sound waves through a hole, slot, tube or bore
Implementation Method 3
A main chamber of the earphone shell contains at least one front-vented driver placed with no direct coupling to other such drivers or to the ear canal
Data Source
AI summary
A personal listening device including at least one direct-radiating balanced-armature audio transducer and at least one substantially enclosed, indirect-radiating, or tube-coupled balanced-armature transducer. The tube-connected transducer emits sound waves which pass through a hole, slot, tube or bore before entering an airspace near the eardrum of a user, while the direct-radiating transducer emits sound waves directly into the airspace adjacent the indirect-radiating transducer or tube, which airspace is contiguous with the airspace near the eardrum of the user.