MEMS Microphone Ultrasonic Response for Dynamic Audio Control
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Solution Overview
Problem
Microphones designed for high-performance applications in audible frequency ranges have limited response in ultrasonic frequencies, often sacrificing signal-to-noise ratio (SNR) to achieve bandwidth into the ultrasonic range.
Innovation Solution
A MEMS microphone device capable of capturing both audio-band and ultrasonic signals simultaneously, with processing circuitry to adjust configuration parameters based on ultrasonic signals, enabling functionalities like proximity detection, range-finding, and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electrostatic capacitor-based microphone designs extend bandwidth into ultrasonic range, then frequency response is improved, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent applies dynamics by making the microphone's frequency response characteristics adjustable through processing circuitry that modifies configuration parameters based on detected ultrasonic signals. The system can dynamically adapt its behavior to optimize performance in different frequency ranges, allowing the microphone to maintain high SNR in audible frequencies while extending ultrasonic capability when needed.
Solution Approach 2:
The patent implements parameter changes by using processing circuitry to modify configuration parameters of the MEMS microphone device in response to ultrasonic signal detection. This allows the microphone to change its operational characteristics - adjusting gain, muting, and frequency response - to resolve the contradiction between maintaining high SNR in audible ranges and extending ultrasonic bandwidth.
2Adaptability or versatility
If MEMS microphone captures both audio-band and ultrasonic signals simultaneously, then functionality is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a single MEMS microphone device that can simultaneously perform multiple functions: capturing audio-band signals for voice communication, detecting ultrasonic signals for proximity sensing and range-finding, and using the ultrasonic feedback to dynamically adjust its own operation. This multi-functional approach eliminates the need for separate devices for each function.
Solution Approach 2:
The patent implements feedback by using the processed ultrasonic signal information to dynamically adjust the configuration parameters of the MEMS microphone device. The processing circuitry receives ultrasonic signal data, processes it to determine configuration changes, and then modifies the microphone's operation in real-time, creating a closed-loop system that enhances functionality while managing complexity through intelligent control.
3Reliability
If processing circuitry dynamically adjusts configuration parameters based on ultrasonic feedback, then audio quality is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by having the processing circuitry continuously monitor and process ultrasonic signals in advance, preparing configuration parameter adjustments before they are needed for optimal audio capture. The system proactively detects ultrasonic signals and pre-adjusts parameters, reducing the time lag between signal detection and parameter optimization.
Solution Approach 2:
The patent implements continuity of useful action by maintaining continuous processing of ultrasonic signals and continuous adjustment of configuration parameters. Rather than periodic updates, the system operates continuously to ensure real-time optimization of audio quality, minimizing interruptions and processing delays while constantly adapting to changing acoustic environments.
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 audio capture by dynamically adjusting gain and muting based on ultrasonic feedback, optimizing audio quality and functionality in real-time.
Implementation Method 1
a microelectromechanical system (MEMS) microphone device configured to capture signal data representing an ultrasonic signal and an audio-band signal simultaneously
Implementation Method 2
the ultrasonic signal can be representative of a signal for the first MEMS microphone device to determine a distance from the first MEMS microphone device to a second MEMS microphone device
Data Source
AI summary
Utilization of microphone ultrasonic response is described. A system, comprising: a microelectromechanical system (MEMS) microphone device configured to capture signal data representing an ultrasonic signal and an audio-band signal simultaneously, and a processing circuitry configured to adjust a configuration parameter associated with the MEMS microphone device based on the ultrasonic signal.