Microphone Unit Vibration Noise Suppression Center Gravity
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Solution Overview
Problem
Existing sound collecting devices in vehicles face accuracy issues in suppressing vibration noise due to the distance between the vibration observation device and microphones, leading to suboptimal target sound acquisition.
Innovation Solution
A microphone unit with a vibration observation device positioned at the center of gravity of a regular polygon formed by connecting the centers of adjacent microphones, ensuring equal and minimized distances to each microphone, enhancing noise suppression accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the vibration observation device is located at a distant place from the microphone or when the distance between the vibration observation device and each of a plurality of microphones is significantly different from one another, then the device complexity is reduced, but the measurement precision of vibration sound suppression deteriorates
Solution Approach 1:
The vibration observation device is positioned at the center of gravity of the regular polygon formed by connecting the centers of adjacent microphones, ensuring equal distances to all microphones. This equipotential positioning minimizes the distance variation and optimizes the vibration observation accuracy for all microphones simultaneously.
Solution Approach 2:
The patent employs a regular polygon configuration (highly symmetric) for microphone arrangement, which is the opposite of asymmetry. This symmetric arrangement ensures that the center of gravity is equidistant from all microphones, creating an optimal configuration for vibration observation while maintaining measurement precision.
2Measurement precision
If the vibration observation device is positioned closer to the microphones, then the measurement precision of vibration sound suppression improves, but the device complexity increases
Solution Approach 1:
By positioning the vibration observation device at the center of gravity of the regular polygon formed by microphone centers, the patent achieves equal distances to all microphones. This positioning optimizes vibration observation precision while maintaining a relatively simple device structure without requiring complex positioning mechanisms.
3Measurement precision
If the distances between the vibration observation device and microphones are made equal, then the measurement precision of vibration sound suppression improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent uses a regular polygon configuration for microphone arrangement, which provides inherent geometric symmetry. This symmetric arrangement naturally ensures equal distances from the center of gravity to all microphones, reducing the burden on manufacturing precision while achieving optimal measurement precision.
Solution Approach 2:
The center of gravity position in a regular polygon configuration provides equal distances to all vertices (microphones) by geometric properties. This inherent geometric property ensures measurement precision without requiring high manufacturing precision, as the equal distance is achieved through the configuration itself rather than requiring precise manual positioning.
Data Source
AI summary
To provide a microphone unit capable of acquiring a target sound with high accuracy. A microphone unit in accordance with an exemplary embodiment of the present invention includes a plurality of microphones, a microphone substrate on which the plurality of microphones are mounted, and a vibration observation device disposed at roughly a center of gravity of a shape that is formed by connecting centers of certain adjacent microphones among the plurality of microphones.