Microphone Gating via Ultrasonic Motion Detection
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Solution Overview
Problem
Conventional microphones often capture background noise and undesired sounds when users move in and out of the range of interest, leading to suboptimal audio quality due to the inability to dynamically turn the microphone on and off based on user proximity.
Innovation Solution
A microphone gating system that uses a transmitter to emit ultrasonic signals and a receiver to detect motion, with a controller determining the user's distance and turning the microphone on or off based on predefined ranges of interest, thereby reducing background noise by only activating the microphone when the user is within a specified range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the microphone remains continuously active to capture user speech, then speech capture capability is maintained, but background noise and undesired sounds are captured when the user is outside the range of interest
Solution Approach 1:
The microphone gating system dynamically changes the operational state of the microphone from continuously active to selectively active based on real-time motion detection. The system transitions the microphone between on and off states according to whether motion is detected within the range of interest, thereby adapting to varying conditions and eliminating background noise while maintaining speech capture capability.
Solution Approach 2:
The system employs feedback through motion detection to control microphone activation. The motion detector continuously monitors the environment and provides feedback signals to the gating controller, which then adjusts the microphone state accordingly. This closed-loop feedback mechanism ensures the microphone is activated only when relevant sound sources are present, preventing background noise capture.
2Object-affected harmful factors
If the microphone is turned off when the user is outside the range of interest, then background noise is reduced, but the system cannot dynamically respond to user movement in and out of the range
Solution Approach 1:
The system replaces manual or mechanical microphone control with an automated electronic gating system driven by motion detection technology. The ultrasonic motion detector and electronic gating controller substitute for mechanical switches or manual control, enabling automatic detection of user movement and dynamic adjustment of microphone activation states without mechanical intervention.
Solution Approach 2:
The microphone gating system is self-regulating through automatic motion detection and control. The system monitors its own operational environment, detects user presence or absence automatically, and adjusts the microphone state without external intervention. This self-service capability ensures continuous adaptive response to user movement while maintaining background noise reduction.
3Object-affected harmful factors
If a motion detection system is added to control microphone gating, then background noise is reduced through selective activation, but device complexity increases
Solution Approach 1:
The motion detection system is designed to serve multiple functions: detecting user presence, determining range of interest, and controlling microphone gating. By making the detection system universal and multi-functional, the patent reduces the need for separate dedicated components for each function, thereby managing system complexity while achieving background noise reduction through selective microphone activation.
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
Effectively reduces background noise by dynamically controlling the microphone's activation state based on user proximity, enhancing audio quality by minimizing unwanted sound capture when the user is outside the range of interest.
Implementation Method 1
transmitting at least one transmit signal using a transmitter towards an object and recording at least one reflected signal reflected from the object using a receiver
Data Source
AI summary
A system and method for performing microphone gating operations, is disclosed. The system and method include a transmitter configured to emit a transmit signal towards an object and a receiver configured to receive a reflected signal from the object, the reflected signal corresponding to the transmit signal. The system and method also include a controller configured to instruct the transmitter to emit the transmit signal and receive the reflected signal from the receiver. The controller is further configured to detect motion of the object based upon the reflected signal and turn a microphone on or off based upon the motion of the object.