Microphone Noise Counteraction Using Damping and Opposite Polarity
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Solution Overview
Problem
Conventional microphones exhibit varying noise suppression effects across different frequency ranges, failing to effectively counteract noise and improve sound quality.
Innovation Solution
A microphone design incorporating a housing unit, capsule unit, noise-counteracting unit, damping unit, and processing unit, which utilizes through holes, chambers, and damping components to generate and counteract mechanical waves, and electrical signals with opposite polarities to suppress noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microphone designs are used, then the structure is simple, but the noise suppression effect varies across different frequency ranges and is not effective
Solution Approach 1:
The microphone is divided into multiple functional modules: capsule unit, noise-counteracting unit, damping unit, and processing unit. Each module performs a specific function in the noise suppression process, allowing the system to effectively counteract noise across different frequency ranges while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The noise-counteracting unit generates a counteracting signal in advance that is opposite in polarity to the noise signal. This preliminary anti-action occurs before the noise reaches the output, enabling the system to proactively cancel noise across various frequency ranges rather than reacting to it after detection.
2Reliability
If a single chamber design is used, then the device complexity is low, but the ability to counteract mechanical waves and vibrations is insufficient
Solution Approach 1:
The acoustic environment is segmented into multiple chambers: first chamber for acoustic wave reception, second chamber for mechanical wave generation, and third chamber for damping. This segmentation allows each chamber to perform its specific function in the noise counteraction process, improving mechanical wave suppression while maintaining clear functional separation.
Solution Approach 2:
The damping component acts as an intermediary between the second chamber (mechanical wave source) and the capsule unit. It mediates the interaction by absorbing and dissipating mechanical wave energy, preventing direct transmission of vibrations to the capsule while allowing acoustic waves to pass through the through-holes.
3Reliability
If no damping components are used, then the device complexity is reduced, but the amplitude and phase control of mechanical waves is insufficient
Solution Approach 1:
The damping function is extracted as a separate damping component with specific damping elements, distinct from the structural housing. This extracted damping component can be independently optimized for amplitude and phase control of mechanical waves, improving suppression effectiveness while allowing the main housing structure to remain relatively simple.
Solution Approach 2:
The damping component is designed to change the amplitude and phase parameters of mechanical waves passing through it. By adjusting the damping element properties (material, geometry, configuration), the system can control the amplitude reduction and phase shift of mechanical waves, enabling effective counteraction when combined with the counteracting signal.
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
Enhances noise suppression across a wide frequency range by counteracting mechanical and electrical noise components, improving sound quality and reducing undesired vibrations.
Implementation Method 1
The damping component is disposed on the carrier to cover the at least one through hole, and is configured to change one of an amplitude and a phase of the second mechanical wave passing therethrough
Implementation Method 2
The capsule unit is configured to generate a primary electrical signal composed of a primary signal part attributed to an acoustic wave and a secondary signal part attributed to a first mechanical wave
Data Source
AI summary
A microphone includes a housing unit, a capsule unit mounted on the housing unit, a noise-counteracting unit electrically connected to the capsule unit with opposite electrical polarity, and a damping unit connected to the housing unit. The capsule unit generates a primary electrical signal composed of a primary signal part attributed to an acoustic wave and a secondary signal part attributed to a first mechanical wave which is generated due to vibration of the housing. The noise-counteracting unit generates a secondary electrical signal attributed to the first mechanical wave and having an electrical polarity opposite to that of the primary electrical signal, so that the secondary electrical signal may counteract the secondary signal part of primary electrical signal. The damping unit generates a second mechanical wave to counteract the first mechanical wave when the first and second mechanical waves are transmitted to the capsule unit.