Automotive Microphone Enclosure with Elastomeric Membrane
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Exterior-facing microphones in vehicles face challenges such as resistance to weather and harsh operating conditions, including wind, sunlight, and high-pressure water, while also needing to detect specific frequencies for effective audio sensing functions.
Innovation Solution
A microphone enclosure with a housing and a membrane that protects the microphone from contaminants and is designed to provide specific frequency response and acoustic sensitivity, featuring adjustable sound channels and membranes made of elastomeric materials like silicone, along with protective meshes to withstand harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a membrane is added to protect the microphone from contaminants, then reliability is improved, but acoustic performance may deteriorate
Solution Approach 1:
The patent employs a thin elastomeric membrane (such as silicone rubber) that is sufficiently thin to transmit acoustic signals effectively while being thick enough to provide physical protection against contaminants. The membrane's flexible nature allows it to vibrate in response to sound waves, transmitting acoustic energy to the microphone while blocking dust, water, and other environmental contaminants.
Solution Approach 2:
The patent optimizes the membrane's physical parameters including thickness, material composition, and tension to achieve the right balance between protection and acoustic transmission. By carefully controlling these parameters, the membrane can be made thin enough to maintain acoustic sensitivity while remaining durable enough to protect against harsh environmental conditions.
2Measurement precision
If the sound channel dimensions are optimized for specific frequency response, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating a sound channel with specific geometric characteristics (such as tapered or flared sections) that are optimized for particular frequency ranges. Rather than making the entire enclosure complex, only specific portions of the sound channel are shaped to provide the desired acoustic filtering and sensitivity for target frequencies used in voice recognition and emergency vehicle detection.
3Adaptability or versatility
If the microphone is exposed to exterior environment for audio sensing, then adaptability is improved, but resistance to harsh conditions deteriorates
Solution Approach 1:
The membrane serves as an intermediary element between the exterior environment and the microphone. It allows the microphone to indirectly sense exterior sounds by transmitting acoustic vibrations while blocking direct exposure to harmful environmental factors such as rain, snow, dust, and high-pressure water from car washes.
Solution Approach 2:
The elastomeric membrane creates a protective barrier that maintains the microphone's ability to detect exterior sounds while shielding it from environmental damage. The membrane's material properties (elasticity, thickness, and composition) are selected to withstand UV exposure, temperature variations, and mechanical stress from weather conditions.
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 enclosure effectively protects the microphone from environmental damage and maintains optimal acoustic performance for applications like speech recognition and emergency vehicle detection, ensuring reliable operation across various weather conditions.
Implementation Method 1
a membrane spaced apart from the microphone and configured to transmit sound to the microphone
Implementation Method 2
The sound channel has at least one dimension configured to provide a specific frequency response or acoustic sensitivity
Data Source
AI summary
A microphone enclosure for a vehicle exterior component includes a housing, and a microphone disposed within the housing. The housing also includes a first outer portion defining a sound channel for conveying sound to the microphone. The microphone enclosure includes a membrane of elastomeric material, such as silicone, disposed over the sound channel and configured to prevent contaminants, such as moisture and dust, from entering the sound channel. The sound channel has at least one dimension configured to provide a specific frequency response or acoustic sensitivity. A protective mesh may be disposed below the first membrane and configured to limit deflection of the first membrane. The housing includes an outer surface defining an aperture and a passageway providing auditory communication between the aperture and the microphone. In some embodiments, the passageway is configured as a tortuous path impeding straight-line access from the aperture to the membrane.