Earbud Spout Baffle Layout for Microphone Dynamic Range
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Solution Overview
Problem
Current ear-wearable electronic devices face challenges with reduced microphone dynamic range due to high frequency responses caused by acoustic waves from the receiver, often exacerbated by wax mitigation devices, leading to compromised audio performance.
Innovation Solution
Incorporation of a baffle in the spout portion of the device's front housing that separates the receiver and microphone paths, reducing elevated high frequency responses and increasing the microphone's dynamic range without increasing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the microphone is positioned close to the acoustic port for compact design, then the device size is reduced, but high frequency responses from the receiver are incident upon the microphone inlet causing reduced dynamic range
Solution Approach 1:
The internal acoustic space is segmented into distinct receiver and microphone paths using a baffle structure. This segmentation physically separates the acoustic environments of the receiver and microphone, preventing high frequency receiver waves from reaching the microphone inlet while maintaining compact overall device dimensions.
Solution Approach 2:
A baffle structure serves as an intermediary element between the receiver and microphone paths. This intermediate structure selectively blocks high frequency acoustic waves from the receiver from reaching the microphone while allowing the microphone to still access ambient sound through the acoustic port.
2Object-affected harmful factors
If wax mitigation devices are added to protect the microphone, then microphone protection is improved, but high frequency interference from the receiver is exacerbated
Solution Approach 1:
The harmful high frequency interference is extracted or removed from the microphone's acoustic environment by introducing a baffle structure. This structure selectively eliminates the problematic high frequency receiver waves from reaching the microphone while preserving the microphone's ability to capture ambient sound and remain protected from wax.
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, enhancing the microphone's dynamic range and improving overall audio performance by positioning the microphone inlet further downstream from the receiver path.
Implementation Method 1
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 as such waves propagate in the receiver path
Data Source
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.