Miniaturized Receiver Assembly Bass Reflex Helmholtz Resonator
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Solution Overview
Problem
Current in-ear devices with miniaturized receivers lack optimal audio performance, particularly in frequency response, which needs enhancement for improved sound reproduction.
Innovation Solution
An in-ear noise-isolating earphone with a miniaturized receiver assembly featuring a bass reflex system, including a front plate with a sound channel and a back plate with a vent port, forming an acoustical Helmholtz resonator to extend low-frequency response, allowing for axial insertion without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If miniaturized receivers are used in in-ear devices, then the device size is reduced and it becomes more acceptable and invisible, but the audio performance and frequency response are compromised
Solution Approach 1:
The patent implements a nested structure where the bass reflex system is integrated within the miniaturized receiver assembly. The front plate with sound channel and back plate with vent port create a compact resonator that fits inside the earphone housing, allowing the miniaturized receiver to achieve enhanced low-frequency response without increasing overall device volume.
Solution Approach 2:
The patent applies parameter changes by tuning the bass reflex system with specific acoustic impedance values and resonant frequencies. The front plate and back plate are designed with specific dimensions and aperture sizes to create a Helmholtz resonator tuned to extend the low frequency response, transforming the limited frequency response of miniaturized receivers into an enhanced audio performance.
2Reliability
If the receiver assembly is made elongated to improve audio performance, then frequency response is enhanced, but the insertion complexity and potential performance compromise increase
Solution Approach 1:
The patent employs asymmetric design in the receiver assembly where the front plate extends beyond the back plate to accommodate the sound channel. This asymmetric configuration optimizes the acoustic path for low-frequency enhancement while maintaining a compact overall form factor that allows straightforward axial insertion into the ear canal.
Solution Approach 2:
The patent utilizes dimensional optimization by arranging the bass reflex system components in a specific three-dimensional configuration. The sound channel extends partially along the length of the front plate, creating an optimized acoustic path that enhances frequency response without requiring excessive length, thus simplifying the insertion process.
3Reliability
If a bass reflex system is added to extend low-frequency response, then audio performance is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the bass reflex system with the receiver housing structure itself. The front plate and back plate serve dual purposes: they form the structural boundaries of the receiver assembly and simultaneously create the bass reflex resonator. This integration eliminates the need for separate bass reflex components, simplifying manufacturing while achieving enhanced low-frequency response.
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 solution provides enhanced frequency response performance, enabling fine-tuning and improved sound reproduction, making the earphone more effective in noise isolation and audio delivery.
Implementation Method 1
The bass reflex system is also known as an acoustical Helmholtz resonator tuned to extend the low frequency response of the loudspeaker.
Implementation Method 2
a miniaturized receiver assembly disposed within the sound bore
Data Source
AI summary
An in-ear device comprises inter alia a miniaturized receiver assembly of a sealed sandwich construction with a front plate and a back plate and an electro-dynamic receiver therebetween, the assembly providing a bass-reflex design with a front resonator.