Microphone Unit with Optical Detector for Sound Hole Blockage
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Solution Overview
Problem
Conventional microphone units used in noise reduction devices face performance deterioration and instability when the sound hole is blocked, such as by a passenger's finger or obstructed by luggage, leading to inaccurate noise detection and discomfort.
Innovation Solution
Incorporating an optical detector within the microphone unit's housing to detect light levels, allowing the controller to switch between normal and interpolation modes, maintaining previous signal processing states during interpolation mode to stabilize operation even if the sound hole is blocked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional microphone unit is used without an optical detector, then the device complexity is low, but the reliability deteriorates when the sound hole is blocked
Solution Approach 1:
The patent combines a microphone body and an optical detector into a single integrated microphone unit with a shared housing and sound hole. This merging allows the system to use one structural entry point for both acoustic and optical detection, improving reliability by enabling the optical detector to monitor sound hole blockage while maintaining a relatively simple overall structure.
Solution Approach 2:
The microphone unit is designed with multi-functionality by incorporating both a microphone body for noise detection and an optical detector for blockage monitoring through the same sound hole. This universal design allows a single component structure to serve multiple detection purposes, enhancing reliability without proportionally increasing complexity.
2Measurement precision
If the sound hole is blocked by a passenger's finger or luggage, then the ease of operation is maintained, but the measurement precision deteriorates
Solution Approach 1:
The optical detector provides feedback about the sound hole's state (blocked or open) to the control unit. Based on this feedback, the control unit adjusts its operation - using noise detection data when the sound hole is open and switching to interpolation mode when blocked. This feedback mechanism ensures measurement precision is maintained by adapting to the actual detection conditions.
Solution Approach 2:
The optical detector continuously monitors the sound hole state in advance before noise detection is performed. When blockage is detected, the system proactively switches to interpolation mode or maintains previous processing states, preventing precision deterioration from occurring in the first place rather than correcting it afterward.
3Productivity
If the controller operates in normal mode with real-time noise detection, then the productivity is high, but the stability worsens when the sound hole is blocked
Solution Approach 1:
The control unit dynamically switches between normal mode and interpolation mode based on optical detector feedback. In normal mode, real-time noise detection provides high productivity. When the sound hole is blocked, the system transitions to interpolation mode that maintains previous processing states, ensuring stability. This dynamic adaptation allows the system to optimize both productivity and stability according to actual conditions.
Solution Approach 2:
The system changes its operational parameters based on sound hole status. When the optical detector confirms the sound hole is open, the controller uses real-time noise detection parameters for high-speed processing. When blocked, it switches to interpolation parameters that maintain previous states, ensuring stability. This parameter change strategy resolves the contradiction between productivity and stability.
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 ensures stable noise reduction performance by maintaining previous signal processing states during interpolation mode, preventing sudden performance drops and passenger discomfort due to incorrect noise detection.
Implementation Method 1
an optical detector that is built in the housing and detects light entering the housing via the sound hole
Implementation Method 2
a microphone body that is built in the housing and detects a sound entering the housing via the sound hole
Data Source
AI summary
A microphone unit in which a microphone body is built in a housing is provided. The microphone body detects a sound entering the housing via a sound hole of the housing. An optical detector that detects light entering the housing via the sound hole is disposed in the housing. Therefore, a detection can be made that the sound hole is blocked by monitoring a detection level of the optical detector, based on a change in the detection level of the optical detector.