Microphone Coupler Acoustic Channel Isolation
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Solution Overview
Problem
Portable communication devices face challenges in maintaining acceptable acoustic performance due to their smaller form factors and increased internal component density, which complicates the optimal placement of microphones and speakers while also dealing with interfering signals from antennae.
Innovation Solution
A microphone coupler system that includes a boot assembly, a platform, and an acoustic channel with a gasket and mesh to direct acoustic signals effectively, forming a conduit that minimizes interference and maintains acoustic performance by isolating the microphone from other components and accommodating the device's compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the device form factor is reduced to improve portability, then the device becomes more portable, but the microphone and speaker placement becomes more difficult due to increased component density
Solution Approach 1:
The internal space is segmented into distinct acoustic zones using acoustic isolation structures. The microphone is isolated in one segment while the speaker occupies another, with acoustic barriers preventing interference between segments. This allows proper spacing and acoustic performance even in compact form factors.
Solution Approach 2:
The microphone assembly is nested within a housing that includes integrated acoustic isolation features. The acoustic barrier structures are nested between the microphone and other components (speaker, antenna), creating layered isolation zones that maintain acoustic performance while maximizing space utilization.
2Reliability
If the microphone is isolated from interfering components to improve acoustic performance, then acoustic performance improves, but the device complexity increases
Solution Approach 1:
The acoustic isolation structures are merged with existing device components rather than being separate additions. Acoustic barriers are integrated into the housing walls and component mounting structures, combining isolation functionality with structural elements already required for device assembly.
Solution Approach 2:
The housing and mounting structures serve multiple functions: they provide mechanical support, define acoustic zones, and act as acoustic barriers simultaneously. This multi-functionality reduces the need for separate isolation components and simplifies the overall device structure.
3Reliability
If acoustic barriers are added to isolate the microphone to maintain acoustic performance, then acoustic performance is maintained, but the internal space available for other components is reduced
Solution Approach 1:
Acoustic isolation is applied locally only where needed between the microphone and specific interfering components (speaker, antenna) rather than creating a complete enclosure. This selective isolation uses minimal material and space while effectively blocking harmful acoustic paths.
Solution Approach 2:
Acoustic barriers are positioned in three-dimensional space to block direct acoustic paths between components. By utilizing vertical and lateral spacing dimensions rather than only horizontal separation, the design achieves effective isolation while maximizing the use of available internal volume.
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 ensures effective voice communication by isolating the microphone from interfering signals and maintaining acceptable acoustic performance within the constrained space of portable devices, reducing the need for additional RF shielding and optimizing the placement of components.
Implementation Method 1
an acoustic channel connecting the microphone to the opening in the housing
Implementation Method 2
an acoustic channel with a gasket and mesh to direct acoustic signals effectively, forming a conduit that minimizes interference
Data Source
AI summary
The invention provides a communication device and a microphone coupler. The device comprises: a microphone; a printed circuit board (PCB) to connect to the microphone; a boot assembly to enclose the microphone and to direct acoustic signals to the microphone; a platform; a housing to enclose the PCB, the microphone, the platform and the boot assembly and to provide an opening to access the microphone; and an acoustic channel connecting the microphone to the opening in the housing. In the device, part of the acoustic channel is formed by a channel formed when the above noted components are assembled together.