Audio Porting Assembly Indirect Acoustic Path
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Solution Overview
Problem
Current microphone porting systems fail to effectively address both wind noise and water blockage issues, particularly in portable devices where space constraints limit the implementation of solutions that work for mobile microphones, and materials like felt can absorb water, leading to poor performance.
Innovation Solution
An audio porting assembly featuring a unitarily molded frame with cavities for the speaker and microphone, covered by a membrane for water sealing, providing indirect porting through a wedge or slot, which reduces wind noise and water intrusion while optimizing acoustic tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If felt is used in microphone porting schemes to resist rain and dust intrusion, then water and dust resistance is improved, but felt absorbs water over time leading to water penetration and complete blockage of the microphone port
Solution Approach 1:
The patent uses a hydrophobic coating applied to the microphone port housing to create a water-repellent surface. This thin film prevents water from adhering to and penetrating the port, eliminating the need for felt materials that absorb water and fail over time. The hydrophobic surface allows water to bead up and roll off, maintaining continuous microphone operation in wet conditions.
2Object-affected harmful factors
If the microphone cartridge is moved back away from the front housing with a large ported surface area to reduce wind noise, then wind noise performance is improved, but space limitations in portable devices prevent implementation
Solution Approach 1:
The patent changes the surface properties of the microphone port housing by applying a hydrophobic coating, which alters how water interacts with the surface. This parameter change allows the microphone to maintain its position close to the front housing in compact portable devices while achieving water resistance without requiring the extensive space needed for traditional wind noise reduction solutions.
3Object-affected harmful factors
If a membrane is added for water sealing in the audio porting assembly, then water sealing performance is improved, but the complexity of the assembly increases
Solution Approach 1:
The patent extracts the water sealing function from a separate membrane component and integrates it directly into the housing structure through a hydrophobic coating. This eliminates the need for additional membrane parts, seals, and associated assembly steps, reducing overall assembly complexity while maintaining effective water sealing.
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 effectively reduces wind noise and water blockage, enhancing microphone performance in compact designs by eliminating the need for separate boots and felt, offering improved sealing and acoustic response.
Implementation Method 1
the surface tension of water can cover the small holes in the housing used for audio ports thereby completely blocking the audio path
Implementation Method 2
Wind passing over the microphone port can generate small pressure pulses which the microphone cartridge converts into noise
Data Source
AI summary
Both water intrusion and wind noise issues are addressed with an audio porting assembly including a single frame (102) having a speaker cavity (110) and a microphone cavity (112) formed therein. An opening (114) formed within the frame (102) between the speaker cavity (110) and the microphone cavity (112) provides a path for indirect porting from the speaker cavity into the microphone cavity. A unitarily molded membrane (104) provides a seal over the frame (102).