Automotive Microphone Module Dual Sound Holes Wind Noise Suppression
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Solution Overview
Problem
Existing microphone modules in automobiles face challenges in balancing external voice control and siren detection functions when moving at high speeds, due to wind noise affecting sound pickup.
Innovation Solution
A microphone module design featuring a first microphone for full frequency range sound pickup and a second microphone for the 700-1500 Hz frequency range, both connected to a single sound channel with separate sound holes, along with a buffer and waterproof membrane for noise suppression and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single microphone is used for both voice control and siren detection, then device complexity is reduced, but measurement precision deteriorates due to wind noise interference at high speeds
Solution Approach 1:
The patent divides the single microphone function into two separate microphones: a first microphone for full-frequency sound pickup and a second microphone specifically for 700-1500 Hz frequency range. This segmentation allows each microphone to be optimized for its specific function, with the second microphone being less susceptible to wind noise interference in the siren detection frequency range.
Solution Approach 2:
The patent applies different characteristics to different parts of the system: the first microphone uses a full-frequency pickup capability with one sound hole, while the second microphone uses a frequency-selective pickup (700-1500 Hz) with a separate sound hole. This local differentiation enables each component to have optimal properties for its specific function.
2Volume of moving object
If the microphone is positioned close to the sound hole for compact design, then device size is reduced, but object-affected harmful factors increase due to turbulence and wind noise
Solution Approach 1:
The patent segments the sound pickup function into two separate microphones with separate sound holes, allowing the second microphone to be positioned and oriented optimally for siren detection while being physically separated from the primary voice control path, thus reducing wind noise interference.
Solution Approach 2:
The patent introduces a wind shield structure as an intermediary element between the external environment and the microphones. This wind shield acts as a mediator that reduces the direct impact of wind turbulence on the microphones while still allowing sound waves to pass through to the sound holes.
3Adaptability or versatility
If the microphone picks up full frequency range for versatile function, then adaptability is improved, but object-generated harmful factors increase due to low-frequency wind noise pickup
Solution Approach 1:
The patent segments the frequency pickup function by assigning the first microphone to handle full-frequency range for general voice control and the second microphone to handle specifically the 700-1500 Hz range for siren detection. This segmentation prevents the full-frequency microphone from being overwhelmed by low-frequency wind noise when detecting sirens.
Solution Approach 2:
The patent applies different frequency response characteristics to different microphones: the first microphone has a full-frequency response for versatile voice control, while the second microphone has a band-pass characteristic (700-1500 Hz) that naturally filters out low-frequency wind noise while maintaining sensitivity to siren frequencies.
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 module effectively suppresses low-frequency wind noise, prevents microphone overload, and maintains balanced functions for external voice control and siren detection even at high speeds.
Implementation Method 1
The present disclosure relates to sound-electric conversion technologies, especially relates to a microphone module applied in automobile
Implementation Method 2
a buffer fixed to one side of the housing away from the receiving cavity... The module effectively suppresses low-frequency wind noise
Data Source
AI summary
The present disclosure discloses a microphone module including a housing having a first sound channel penetrating thereon, a first support member, a first microphone mounted on the first support member and configured to pick up sound signal in full frequency rage, and a second microphone mounted on the first support member and configured to pick up sound signal in a frequency range of 700-1500 Hz; a first sound hole corresponding to the first microphone and a second sound hole corresponding to the second microphone are provided on the first support member; external sound wave entering the first sound channel is transmitted to the first microphone through the first sound hole; external sound wave entering the first sound channel is transmitted to the second microphone through the second sound hole. The microphone module in the present disclosure can balance the functions of external voice control, and siren detection and penetration.