Earpiece Acoustic Insert Isolating Microphone From Speaker
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Solution Overview
Problem
Earpieces with multiple acoustic components face challenges in acoustically sealing these components, leading to microphone saturation due to amplified sound frequencies, which causes nonlinear distortions and affects echo cancellation and speech pickup quality.
Innovation Solution
An earpiece design featuring a single sound channel with an acoustic chamber and channel that acts as a Helmholtz resonator, using an elastomeric insert to acoustically isolate the microphone from the speaker, reducing sound frequencies by 12 dB or more per octave, thereby preventing microphone overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple acoustic components are integrated in the earpiece, then functionality is improved, but acoustic sealing becomes difficult and microphone saturation occurs
Solution Approach 1:
The acoustic space is divided into separate sealed chambers using acoustic barriers. The speaker is isolated in one chamber while the microphone operates in another chamber, with controlled acoustic coupling through a specific pathway. This segmentation prevents sound leakage and interference between components while maintaining both functionalities.
Solution Approach 2:
An acoustic barrier acts as an intermediary element between the speaker and microphone. This barrier selectively blocks direct sound transmission while allowing controlled acoustic coupling through a defined pathway, enabling the microphone to capture ambient sound without being saturated by speaker output.
2Manufacturing precision
If acoustic sealing is implemented to prevent sound leakage, then speech pickup quality is improved, but manufacturing complexity increases due to adhesive requirements
Solution Approach 1:
The acoustic barrier integrates multiple functions into a single component: it provides structural support, creates acoustic sealing, and defines the acoustic pathway. This merging eliminates the need for separate adhesive applications and multiple assembly steps, simplifying manufacturing while maintaining acoustic integrity.
Solution Approach 2:
The acoustic barrier design enables self-sealing through its geometric configuration and material properties. The barrier naturally forms acoustic seals through friction fit and elastic deformation, eliminating the need for external adhesives or complex sealing mechanisms.
3Volume of moving object
If the microphone is placed close to the speaker for compact design, then device size is reduced, but microphone saturation occurs due to amplified sound frequencies
Solution Approach 1:
The acoustic space is divided into separate sealed chambers using acoustic barriers. The speaker is isolated in one chamber while the microphone operates in another chamber, with controlled acoustic coupling through a specific pathway. This segmentation prevents sound leakage and interference between components while maintaining both functionalities.
Solution Approach 2:
The microphone is extracted from the direct sound path of the speaker by placing it in a separate acoustic chamber. This extraction removes the harmful acoustic coupling while maintaining close proximity for compact design, preventing microphone saturation.
4Reliability
If acoustic barriers are added to isolate components, then acoustic integrity is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The acoustic barrier integrates multiple functions into a single component: it provides structural support, creates acoustic sealing, and defines the acoustic pathway. This merging eliminates the need for separate adhesive applications and multiple assembly steps, simplifying manufacturing while maintaining acoustic integrity.
Solution Approach 2:
The acoustic barrier design enables self-sealing through its geometric configuration and material properties. The barrier naturally forms acoustic seals through friction fit and elastic deformation, eliminating the need for external adhesives or complex sealing mechanisms.
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 design effectively reduces microphone saturation, allowing for accurate signal processing and improved speech pickup quality without the need for adhesives, simplifying manufacturing and maintaining acoustic integrity.
Implementation Method 1
An earpiece design featuring a single sound channel with an acoustic chamber and channel that acts as a Helmholtz resonator
Data Source
AI summary
An earpiece includes a shell forming a cavity and a sound channel having a first end connected to and in communication with the cavity, and a second end opposite to the first end, the sound channel forming a single pass-through cavity extending from the first end to the second end; an insert disposed within the cavity; a speaker; a circuit board assembly mounted onto the insert, the circuit board assembly comprising a printed circuit board defining a first side and a second side, and a first microphone disposed on the first side; an acoustic chamber formed between the insert and the circuit board assembly, the first microphone being disposed within the acoustic chamber; and an acoustic channel extending from the acoustic chamber to the sound channel.