Vehicle Windshield Microphone System Active Noise Cancellation
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Solution Overview
Problem
Current microphone systems fail to effectively cancel noise across the entire frequency band transmitted through a vehicle's windshield, leading to diminished noise prevention efficiency over time.
Innovation Solution
A microphone system comprising a measuring device with multiple sound elements and a semiconductor chip that receives vibration and noise signals, inverts the phase of the noise signal, and a piezoelectric driver with flexible layers and a graphene electrode, which is integrated into the vehicle's front glass to cancel noise signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional noise prevention materials are used in the vehicle, then initial noise reduction is achieved, but noise prevention efficiency diminishes over time due to aging
Solution Approach 1:
The patent replaces passive mechanical noise prevention materials with an active electronic noise cancellation system consisting of microphones, signal processing circuits, and speakers. This electronic system does not suffer from aging-related degradation like conventional materials, thereby maintaining noise prevention efficiency over extended periods.
Solution Approach 2:
The noise cancellation system continuously adapts to changing noise conditions by real-time signal processing. The system automatically adjusts to varying environmental noise without requiring manual intervention or replacement, effectively serving itself to maintain optimal performance throughout its service life.
2Reliability
If noise cancellation system is implemented, then noise reduction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into unified components. The semiconductor chip combines signal processing, noise cancellation algorithms, and control functions. The speaker serves both as an audio output device and as an active noise cancellation actuator, reducing overall system complexity despite the advanced functionality.
Solution Approach 2:
The patent employs a hierarchical structure where the semiconductor chip is integrated within the housing, which contains the microphones and speakers. The electronic components are nested within compact arrangements that minimize spatial requirements and simplify system integration, making the complex system more manageable and easier to manufacture.
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 system achieves a high noise cancellation rate by uniformly removing noise across all frequency bands, enhancing the noise reduction efficiency and longevity of the noise cancellation process.
Implementation Method 1
The driver may include a piezoelectric actuator operated by the reverse phase noise signal
Implementation Method 2
a piezoelectric driver with flexible layers and a graphene electrode
Implementation Method 3
MEMS microphones may be classified into capacitive type or piezoelectric type microphones
Data Source
AI summary
A microphone system may include a measuring device that includes a plurality of sound elements and a semiconductor chip connected to the sound elements and receives a vibration signal and a noise signal from the outside to cancel the vibration signal and changes a phase of the noise signal to output a reverse phase noise signal; and a driver that is connected to the semiconductor chip and is included in a front glass of a vehicle and vibrates in response to the reverse phase noise signal to cancel a noise signal inputted from the outside.