Directional Microphone With Sound Delay Filter
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Solution Overview
Problem
Existing MEMS-based directional microphones require multiple microphones, increasing cost and complexity, while existing technologies fail to efficiently achieve directional sound characteristics in noisy environments like vehicles.
Innovation Solution
A microphone design incorporating a sound delay filter with a matrix arrangement of filter holes on a substrate, where the filter holes are arranged in a specific radius and distance pattern, and a method for manufacturing this filter, allowing for directional sound characteristics without the need for multiple microphones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple MEMS microphones are used to achieve directional characteristic, then directional sound pickup capability is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent divides the single microphone structure into multiple functional zones by creating an array of sound holes with different geometries (circular, square, rectangular) and orientations. Each zone processes sound waves differently, achieving directional sensitivity through spatial segmentation rather than using multiple complete microphones.
Solution Approach 2:
The patent transitions from a single-point microphone sensing approach to a two-dimensional array of sound holes. By arranging sound holes in a matrix pattern with varying sizes and orientations across the surface, it creates directional sensitivity through spatial distribution in the x-y plane, effectively adding a dimensional aspect to sound capture.
2Reliability
If multiple MEMS microphones are used to achieve directional characteristic, then directional sound pickup capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple sound sensing functions into a single integrated microphone structure. By combining multiple sound hole arrays with different geometries into one device, it achieves the directional capabilities that would otherwise require multiple separate microphones, thereby reducing overall manufacturing cost.
Solution Approach 2:
The single microphone structure performs multiple functions: it captures omnidirectional sound while simultaneously providing directional sensitivity through its patterned sound hole array. This multi-functionality eliminates the need for separate microphones for different sensing purposes, reducing manufacturing complexity and cost.
3Reliability
If sound delay filter with matrix arrangement of filter holes is used, then directional characteristic is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent varies geometric parameters of the sound holes including size (radius, side length), shape (circular, square, rectangular), and orientation angles to achieve directional sensitivity. By carefully controlling these parameters in the matrix arrangement, it creates acoustic interference patterns that provide directional characteristics without requiring extremely tight manufacturing tolerances.
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 microphone achieves directional sound characteristics with reduced manufacturing errors and costs, enabling effective sound processing in noisy environments like vehicles.
Implementation Method 1
a sound delay filter mounted corresponding to the second sound hole, and in which a plurality of filter holes are formed
Data Source
AI summary
A microphone and a method for manufacturing the same are disclosed. The microphone includes: a main substrate in which a first sound hole is formed; a sound sensing module formed in the main substrate corresponding to the first sound hole; a semiconductor chip electrically connected with the sound sensing module and formed on the main substrate; a cover mounted to the main substrate, and in which a second sound hole is formed; and a sound delay filter mounted corresponding to the second sound hole, and in which a plurality of filter holes are formed.