Microphone Sound-Receiving Structure With Multi-Chamber Wind Noise Filtering
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Solution Overview
Problem
Microphone devices face challenges with wind noise and water ingress, particularly in outdoor applications, due to bulky sponge covers that degrade and create gaps, compromising sound quality and durability.
Innovation Solution
A sound-receiving structure with an outer shell, chambers, porous bodies, and sound passages, utilizing water-resistant breathable filters and dust-proof components to minimize airflow noise and protect against moisture, with chambers designed to match porous body volumes for precise fitting and enhanced noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sponge is used to cover the microphone surface to reduce wind noise, then wind noise resistance is improved, but the device becomes bulky and takes up significant space
Solution Approach 1:
The invention divides the wind noise protection function into multiple separate chambers (first chamber, second chamber, etc.) instead of using a single bulky sponge cover. Each chamber contains its own porous body, distributing the noise reduction function across multiple smaller units that fit within the microphone housing, thereby reducing overall device volume while maintaining wind noise resistance.
Solution Approach 2:
The porous bodies are nested within the chambers, which are in turn nested within the microphone housing structure. The first chamber and second chamber are arranged in sequence, with each containing a porous body. This nested arrangement allows the wind noise protection components to be compactly integrated into the microphone device without increasing external dimensions significantly.
2Object-affected harmful factors
If sponge is used to cover the microphone surface, then wind noise reduction is achieved, but the sponge absorbs moisture and degrades, losing its function
Solution Approach 1:
The invention changes the material parameters of the wind noise protection component by using porous bodies with specific porosity (30%-70%) and density (20-80 kg/m³) that are optimized for wind noise reduction while being less susceptible to moisture absorption compared to traditional sponge. The porous structure allows air passage while maintaining mechanical stability in humid conditions.
Solution Approach 2:
The invention uses composite material structures where porous bodies (made from materials like polyurethane foam, polyester fiber, or acrylic fiber) are combined with protective coatings or treatments that provide water resistance. This composite approach maintains the acoustic absorption properties while adding moisture resistance to improve durability in outdoor and humid environments.
3Object-affected harmful factors
If high-density sponge is used to cover the microphone surface, then wind noise resistance is improved, but it becomes difficult to precisely control dimensions during installation, resulting in gaps
Solution Approach 1:
The invention segments the wind noise protection into multiple chambers with defined geometric boundaries, each containing a porous body. The chambers are formed as separate moldable components with precise dimensions, allowing for better dimensional control during manufacturing compared to a single large sponge cover. Each chamber can be independently manufactured and assembled, improving overall dimensional precision.
Solution Approach 2:
The chambers are designed with flexible or elastic materials that can deform during assembly to ensure tight fitting between components. This flexibility allows the chamber structures to conform precisely to the microphone housing and adjacent components, eliminating gaps that would occur with rigid high-density sponge while maintaining the wind noise reduction function.
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
Effectively reduces wind noise and prevents water ingress, maintaining sound quality and extending device lifespan by using multi-chamber filtration and precise material sizing.
Implementation Method 1
at least one porous body, placed inside the at least one chamber
Implementation Method 2
porous body
Implementation Method 3
a water-resistant breathable filter, positioned on the side of the at least one sound inlet aperture
Data Source
AI summary
A sound-receiving structure with wind noise resistance functionality comprises an outer shell having at least one sound inlet aperture. Inside the outer shell has at least one chamber in communication with the sound inlet aperture, and each chamber contains a porous body. The outer shell also includes at least one sound passage that connects the chamber to at least one microphone unit. The cross-sectional area of the sound passage is smaller than that of the chamber. When external sound passes through the sound inlet aperture and the chamber to the microphone unit, the porous body inside the chamber and the sound passage can significantly and effectively reduce wind noise interference, thereby maintaining the sound quality of the microphone. This structure is also more suitable for multiple microphone unit setups, allowing the number of chambers and passages to be adjusted as required.