Microphone Unit With Partitioned Diaphragm For Noise Removal
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Solution Overview
Problem
Existing microphone units face challenges in achieving sharp directivity and noise removal while maintaining a compact size, as they require multiple diaphragms and precise spacing to detect sound wave direction, making it difficult to reduce device size effectively.
Innovation Solution
A microphone unit design featuring a housing with a partition member formed of a diaphragm that divides the internal space into two areas, with strategically placed through-holes to equalize sound pressure on both sides of the diaphragm, allowing for effective noise cancellation and accurate voice extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple diaphragms are arranged to provide sharp directivity, then noise removal performance is improved, but device size increases
Solution Approach 1:
The single diaphragm is segmented into two separate diaphragms (first diaphragm and second diaphragm) positioned at different locations. This segmentation enables the system to function as a differential microphone, where each diaphragm captures sound pressure from different positions, allowing noise cancellation through signal processing while maintaining a compact overall structure.
Solution Approach 2:
A partition wall is introduced as an intermediary structure between the two diaphragms. This partition wall serves as a physical separator that prevents direct acoustic coupling between the diaphragms while allowing independent sound pressure measurement from each location, enabling noise removal functionality without requiring the diaphragms to be in direct contact or alignment.
2Measurement precision
If diaphragms are spaced at fractions of wavelengths to detect sound direction, then directivity is improved, but device size increases
Solution Approach 1:
The spacing between the two diaphragms is optimized to a specific range (0.5 to 2.0 times the wavelength of target sound waves). This parameter optimization enables effective sound direction detection and noise removal for frequencies up to 10 kHz while maintaining a compact device size, avoiding the need for extremely small or large separations that would require larger devices.
3Volume of moving object
If a single diaphragm is used, then device size is reduced, but noise removal capability deteriorates
Solution Approach 1:
Instead of using a single diaphragm, the invention employs two diaphragms that replicate the sound pressure measurement function at different positions. By copying the measurement function across multiple locations, the system achieves noise removal capability through differential measurement while maintaining a compact size that is only slightly larger than a single-diaphragm design.
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
This configuration enables high-quality noise removal and accurate voice extraction with a simple design, allowing for a compact voice input device that can handle frequencies up to 10 kHz with minimal distortion.
Implementation Method 1
a first through-hole through which the first space communicates with an outer space of the housing and a second through-hole through which the second space communicates with the outer space being formed in the housing
Implementation Method 2
an electrical signal output circuit which outputs an electrical signal based on vibrations of the diaphragm
Data Source
AI summary
A microphone unit includes: a housing which has an inner space; a partition member which is provided in the housing and divides the inner space into a first space and a second space, the partition member being at least partially formed of a diaphragm; and an electrical signal output circuit which outputs an electrical signal based on vibrations of the diaphragm. In the housing, a first through-hole through which the first space communicates with an outer space of the housing and a second through-hole through which the second space communicates with the outer space are formed.