Microphone Vibration Noise Cancellation via Dual Sound Elements
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Solution Overview
Problem
Conventional microphones are ineffective in vehicles due to non-stationary ambient noise and vibration signals, which reduce sound clarity and signal-to-noise ratio, especially in hands-free and voice recognition devices.
Innovation Solution
A microphone design utilizing multiple sound elements and a semiconductor chip to separate and cancel vibration signals from sound signals, improving signal-to-noise ratio by phase modulation and merging signals to extract clear sound output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional microphones are used in vehicles, then they can capture sound signals, but the signal-to-noise ratio deteriorates due to non-stationary ambient noise and vibration signals
Solution Approach 1:
The microphone system segments the sound capture function into multiple sound elements (first sound element and second sound element). The first sound element captures both sound and vibration signals, while the second sound element captures primarily vibration signals. This segmentation allows the system to separate and subsequently eliminate vibration interference through signal processing, thereby improving the signal-to-noise ratio in the final output.
2Measurement precision
If multiple sound elements are added to cancel vibration signals, then the signal-to-noise ratio improves, but the device complexity increases
Solution Approach 1:
The patent merges multiple sound elements and a semiconductor chip into an integrated microphone system. The first sound element, second sound element, and semiconductor chip are combined in a single device, allowing the system to perform both sound capture and vibration cancellation functions simultaneously. This merging approach achieves improved sound signal clarity while managing device complexity through integration rather than separate components.
3Ease of manufacture
If conventional single sound element microphones are used, then the device complexity is low, but they cannot effectively remove non-stationary noise in vehicle environments
Solution Approach 1:
The second sound element acts as an intermediary that specifically captures vibration signals without capturing the primary sound signal. By introducing this intermediary element, the system can obtain vibration signal information separately and use it to cancel vibration interference from the first sound element's output. This intermediary approach improves noise removal effectiveness while maintaining a relatively simple microphone structure through the addition of only one extra sound element.
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 sound signal sensitivity and clarity by effectively canceling vibration noise, thereby improving the signal-to-noise ratio in vehicles with simultaneous sound and vibration signals.
Implementation Method 1
conventional electret condenser microphone (ECM)
Implementation Method 2
an MEMS microphone has stronger humidity resistance and heat resistance than a conventional electret condenser microphone (ECM)
Implementation Method 3
modulate a phase of the second initial signal
Data Source
AI summary
A manufacturing method for a microphone is provided. The microphone includes a case that is vibrated by a vibration signal. A sound inlet through which a sound signal is input is formed at a portion of the case and a first sound element is formed in the case at a position corresponding to the sound inlet. The first sound element receives the sound signal and the vibration signal to output a first initial signal. A second sound element is formed to be adjacent to the first sound element and receives the vibration signal to output a second initial signal. A semiconductor chip is connected to the first sound element and the second sound element and receives the first initial signal and the second initial signal to output a final signal.