Ear-Wearable Baffle Layout for Microphone Dynamic Range
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Solution Overview
Problem
Current ear-wearable electronic devices face issues with reduced microphone dynamic range due to high frequency responses caused by acoustic waves from the receiver, which are often exacerbated by wax mitigation devices, leading to compromised audio performance.
Innovation Solution
Incorporation of a baffle in the spout portion of the device that separates the receiver and microphone paths, positioning the microphone inlet further downstream while maintaining a barrier to reduce elevated high frequency responses, thereby increasing the microphone's dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the microphone is positioned close to the acoustic port for effective sound capture, then the microphone can detect ambient sounds better, but high frequency responses from the receiver acoustic waves incident upon the microphone inlet increase, reducing the microphone's dynamic range
Solution Approach 1:
The patent divides the acoustic pathway into separate receiver path and microphone path using a baffle structure. The baffle creates distinct acoustic channels that prevent direct interaction between receiver acoustic waves and the microphone inlet, while still allowing both components to access the acoustic port for their respective functions.
Solution Approach 2:
The baffle acts as an intermediary element positioned between the receiver acoustic waves and the microphone inlet. It mediates the acoustic field by blocking direct propagation paths of high frequency waves from the receiver while preserving the overall acoustic functionality of the device.
2Object-affected harmful factors
If a barrier is introduced to block receiver acoustic waves from reaching the microphone, then high frequency interference is reduced, but the device complexity increases
Solution Approach 1:
The baffle structure is integrated into the existing housing architecture of the ear-wearable device, merging the interference blocking function with the structural housing. This approach combines multiple functions (structural support, acoustic separation, and wave blocking) into a single integrated component rather than adding separate discrete elements.
Solution Approach 2:
The baffle serves multiple functions simultaneously: it provides structural support as part of the housing, creates acoustic separation between receiver and microphone paths, blocks high frequency interference waves, and maintains the acoustic port accessibility for both receiver and microphone. This multi-functionality reduces the need for additional separate components.
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 baffle effectively reduces high frequency interference from the receiver, enhancing the microphone's dynamic range and improving overall audio performance without increasing the device's size.
Implementation Method 1
The baffle can be configured to separate a receiver path and a microphone path. The receiver path can be configured to acoustically couple a receiver to an acoustic port such that acoustic waves produced by the receiver can propagate through the receiver path
Implementation Method 2
the baffle can reduce elevated high frequency responses of the microphone caused by acoustic waves produced by the receiver that may be incident upon the microphone inlet
Data Source
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AI summary
Various embodiments of an ear-wearable electronic device are disclosed. The device includes a receiver disposed in a rear housing that is acoustically coupled to an acoustic port of a front housing of the device by a receiver path extending between the receiver and the acoustic port. The front and rear housings are connected to form an enclosure. The device further includes a microphone disposed in a spout portion of the front housing and acoustically coupled to the acoustic port by a microphone path that extends between a microphone inlet of the microphone and the acoustic port. A baffle disposed in the spout portion has a first end that extends at least to either a plane defined by the acoustic port or a mesh disposed over or at least partially within the acoustic port. The baffle at least partially defines a barrier that separates the receiver path and the microphone path.